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García-Macía J, Chaouni M, Morollón S, Bustamante J, López-Ricaurte L, Martínez-Dalmau J, Rodríguez-Moreno B, Urios V. Lesser kestrels of the same colony do not overwinter together. Curr Zool 2024; 70:505-512. [PMID: 39176067 PMCID: PMC11336659 DOI: 10.1093/cz/zoad028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 03/30/2023] [Indexed: 08/24/2024] Open
Abstract
Migratory connectivity describes the linkage between breeding and nonbreeding sites, having major ecological implications in birds: 1 season influence the success of an individual or a population in the following season. Most studies on migratory connectivity have used large-scale approaches, often considering regional populations, but fine-scale studies are also necessary to understand colony connectivity. The lesser kestrel Falco naumanni, an insectivorous migratory raptor which form colonies during the breeding period, was considered to have strong connectivity based on regional populations. However, no small-scale studies on migratory connectivity have been conducted. Therefore, we GPS (Global Positioning System)-tracked 40 adult lesser kestrels from 15 different Spanish breeding colonies, estimating the overlap index between home ranges and the distance between their centroids. It was found that lesser kestrels from the same breeding colony placed their nonbreeding areas at 347 ± 281 km (mean ± standard deviation) away from each other (range = 23-990), and their home ranges overlapped by 38.4 ± 23.6%. No differences between intra-colony and inter-colony metrics were found, which suggests that lesser kestrels from the same breeding cluster do not overwinter together, but they spread out and mixed independently of the colony belonging throughout the nonbreeding range of the species. Ultimately, this study highlights the importance of performing connectivity studies using fine-scale approaches.
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Affiliation(s)
- Jorge García-Macía
- Grupo de Investigación Zoología de Vertebrados, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain
| | - Munir Chaouni
- Grupo de Investigación Zoología de Vertebrados, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain
| | - Sara Morollón
- Grupo de Investigación Zoología de Vertebrados, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain
| | - Javier Bustamante
- Department of Wetland Ecology, Estación Biológica de Doñana (CSIC), C/ Américo Vespucio 26, 41092, Sevilla, Spain
| | - Lina López-Ricaurte
- Department of Wetland Ecology, Estación Biológica de Doñana (CSIC), C/ Américo Vespucio 26, 41092, Sevilla, Spain
| | | | | | - Vicente Urios
- Grupo de Investigación Zoología de Vertebrados, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain
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Zhang T, Xu Y, Ran J. Quantitative evaluation of the global impacts of human land modification on raptors. CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2024; 38:e14228. [PMID: 38441344 DOI: 10.1111/cobi.14228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 09/25/2023] [Accepted: 11/29/2023] [Indexed: 05/30/2024]
Abstract
Raptors are threatened by anthropogenic land modifications, but targeted quantitative assessment of these impacts is lacking. We conducted the first global quantitative evaluation of the impacts of human-modified land on raptors. We used eBird data from 2001 to 2020 on 425 raptor species and occupancy models to assess the impacts of human-modified land on raptor distribution. The mean spatiotemporal correlations of human settlement, cropland, and pasture with raptor occupancy probability were -0.048 (SE 0.031), -0.134 (0.032), and -0.145 (0.032), respectively. The mean sensitivity of raptor occupancy probability to settlement, cropland, and pasture was -5.760 (2.266), -3.128 (1.540), and -2.402 (1.551), respectively. The occupancy probability of raptors with a large body mass was more negatively correlated with cropland (phylogenetic generalized least squares regressions: slope = -0.052 [SE 0.022], t = -2.335, df = 1, 407, p = 0.020, λ = 0.006) and more positively correlated with pasture (slope = 0.047 [0.022], t = 2.118, df = 1, 407, p = 0.035, λ = 0.013). The occupancy probability of raptors with a more extensive range size was more positively correlated with cropland (slope = 0.002 [0.004], t = 0.399, df = 1, 407, p < 0.001, λ = 0.000). Raptors that prefer open habitats were more positively correlated with cropland (analysis of variance: F = 3.424, df = 2, p = 0.034, λ = 0.000) and pasture (F = 6.577, df = 2, p = 0.002, λ = 0.000). In Africa and South America, where raptor species are most abundant, raptor occupancy probability decreased over 20 years, most likely due to habitat fragmentation associated with human land modification. Although raptors with different ecological characteristics had different responses to human land modification, the impacts of settlement, cropland, and pasture on mean raptor occupancy probability were negative, regardless of space and time.
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Affiliation(s)
- Taxing Zhang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
- Sichuan Key Laboratory of Conservation Biology on Endangered Wildlife, Sichuan University, Chengdu, China
| | - Yu Xu
- School of Life Sciences, Guizhou Normal University, Guiyang, China
| | - Jianghong Ran
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
- Sichuan Key Laboratory of Conservation Biology on Endangered Wildlife, Sichuan University, Chengdu, China
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3
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Davies JG, Kirkland M, Miller MGR, Pearce-Higgins JW, Atkinson PW, Hewson CM. Spring arrival of the common cuckoo at breeding grounds is strongly determined by environmental conditions in tropical Africa. Proc Biol Sci 2023; 290:20230580. [PMID: 37339739 PMCID: PMC10281800 DOI: 10.1098/rspb.2023.0580] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 05/30/2023] [Indexed: 06/22/2023] Open
Abstract
Failure to adapt migration timing to changes in environmental conditions along migration routes and at breeding locations can result in mismatches across trophic levels, as occurs between the brood parasitic common cuckoo Cuculus canorus and its hosts. Using satellite tracking data from 87 male cuckoos across 11 years, we evaluate why the cuckoo has not advanced its arrival to the UK. Across years, breeding ground arrival was primarily determined by timing of departure from stopover in West Africa before northward crossing of the Sahara. Together with high population synchrony and low apparent endogenous control of this event, this suggests that a seasonal ecological constraint operating here limits overall variation in breeding grounds arrival, although this event was itself influenced by carry-over from timing of arrival into tropical Africa. Between-year variation within individuals was, in contrast, mostly determined by northward migration through Europe, probably due to weather conditions. We find evidence of increased mortality risk for (a) early birds following migration periods positively impacting breeding grounds arrival, and (b) late birds, possibly suffering energy limitation, after departure from the breeding grounds. These results help identify areas where demands of responding to global change can potentially be alleviated by improving stopover quality.
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Affiliation(s)
- Jacob G. Davies
- British Trust for Ornithology Scotland, Stirling University Innovation Park, Beta Centre (Unit 15), Stirling, FK9 4NF, UK
| | - Máire Kirkland
- British Trust for Ornithology, The Nunnery, Thetford, IP24 2PU, Norfolk, UK
| | - Mark G. R. Miller
- British Trust for Ornithology, The Nunnery, Thetford, IP24 2PU, Norfolk, UK
- School of Biological Sciences, Monash University, Clayton, Victoria 3800, Australia
| | | | - Philip W. Atkinson
- British Trust for Ornithology, The Nunnery, Thetford, IP24 2PU, Norfolk, UK
| | - Chris M. Hewson
- British Trust for Ornithology, The Nunnery, Thetford, IP24 2PU, Norfolk, UK
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Fattorini N, Costanzo A, Romano A, Rubolini D, Baillie S, Bairlein F, Spina F, Ambrosini R. Eco-evolutionary drivers of avian migratory connectivity. Ecol Lett 2023. [PMID: 37125435 DOI: 10.1111/ele.14223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 03/23/2023] [Accepted: 03/24/2023] [Indexed: 05/02/2023]
Abstract
Migratory connectivity, reflecting the extent by which migrants tend to maintain their reciprocal positions in seasonal ranges, can assist in the conservation and management of mobile species, yet relevant drivers remain unclear. Taking advantage of an exceptionally large (~150,000 individuals, 83 species) and more-than-a-century-long dataset of bird ringing encounters, we investigated eco-evolutionary drivers of migratory connectivity in both short- and long-distance Afro-Palearctic migratory birds. Connectivity was strongly associated with geographical proxies of migration costs and was weakly influenced by biological traits and phylogeny, suggesting the evolutionary lability of migratory behaviour. The large intraspecific variability in avian migration strategies, through which most species geographically split into distinct migratory populations, explained why most of them were significantly connected. By unravelling key determinants of migratory connectivity, our study improves knowledge about the resilience of avian migrants to ecological perturbations, providing a critical tool to inform transboundary conservation and management strategies at the population level.
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Affiliation(s)
- Niccolò Fattorini
- Department of Environmental Science and Policy, University of Milano, Milan, Italy
- Department of Life Sciences, University of Siena, Siena, Italy
- NBFC, National Biodiversity Future Center, Palermo, Italy
| | - Alessandra Costanzo
- Department of Environmental Science and Policy, University of Milano, Milan, Italy
| | - Andrea Romano
- Department of Environmental Science and Policy, University of Milano, Milan, Italy
| | - Diego Rubolini
- Department of Environmental Science and Policy, University of Milano, Milan, Italy
- Istituto di Ricerca sulle Acque, IRSA-CNR, Brugherio, Italy
| | | | - Franz Bairlein
- Institute of Avian Research, Wilhelmshaven, Germany
- Max-Planck-Institute of Animal Behavior, Radolfzell, Germany
| | - Fernando Spina
- Area Avifauna Migratrice, Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA), Ozzano dell'Emilia, Italy
| | - Roberto Ambrosini
- Department of Environmental Science and Policy, University of Milano, Milan, Italy
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Teitelbaum CS, Bachner NC, Hall RJ. Post‐migratory nonbreeding movements of birds: A review and case study. Ecol Evol 2023. [DOI: 10.1002/ece3.9893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023] Open
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Pancerasa M, Ambrosini R, Romano A, Rubolini D, Winkler DW, Casagrandi R. Across the deserts and sea: inter-individual variation in migration routes of south-central European barn swallows (Hirundo rustica). MOVEMENT ECOLOGY 2022; 10:51. [PMID: 36419202 PMCID: PMC9682807 DOI: 10.1186/s40462-022-00352-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND The spatiotemporal organization of migratory routes of long-distance migrants results from trade-offs between minimizing the journey length and en route risk of migration-related mortality, which may be reduced by avoiding crossing inhospitable ecological barriers. Despite flourishing avian migration research in recent decades, little is still known about inter-individual variability in migratory routes, as well as the carry-over effects of spatial and temporal features of migration on subsequent migration stages. METHODS We reconstructed post- and pre-breeding migration routes, barrier crossing behaviour and non-breeding movements of the largest sample (N = 85) analysed to date of individual barn swallows breeding in south-central Europe, which were tracked using light-level geolocators. RESULTS Most birds spent their non-breeding period in the Congo basin in a single stationary area, but a small fraction of itinerant individuals reaching South Africa was also observed. Birds generally followed a 'clockwise loop migration pattern', moving through the central Mediterranean and the Sahara Desert during post-breeding (north to south) migration yet switching to a more western route, along the Atlantic coast of Africa, Iberia and western Mediterranean during the pre-breeding (south to north) migration. Southward migration was straighter and less variable, while northward migration was significantly faster despite the broader detour along the Atlantic coast and Iberia. These patterns showed limited sex-related variability. The timing of different circannual events was tightly linked with previous migration stages, considerably affecting migration route and speed of subsequent movements. Indeed, individuals departing late from Africa performed straighter and faster pre-breeding migrations, partly compensating for the initial departure delays, but likely at the cost of performing riskier movements across ecological barriers. CONCLUSIONS Different spatiotemporal migration strategies during post- and pre-breeding migration suggest that conditions en route may differ seasonally and allow for more efficient travelling along different migration corridors in either season. While highlighting patterns of inter-individual variability, our results support increasing evidence for widespread loop migration patterns among Afro-Palearctic avian migrants. Also, they suggest that carry-over effects acting across different phases of the annual cycle of migratory species can have major impacts on evolutionary processes.
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Affiliation(s)
- Mattia Pancerasa
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico Di Milano, Via Ponzio 34/5, 20131, Milan, Italy
| | - Roberto Ambrosini
- Dipartimento di Scienze e Politiche Ambientali, Università degli Studi di Milano, Via Celoria 26, 20133, Milan, Italy.
| | - Andrea Romano
- Dipartimento di Scienze e Politiche Ambientali, Università degli Studi di Milano, Via Celoria 26, 20133, Milan, Italy
| | - Diego Rubolini
- Dipartimento di Scienze e Politiche Ambientali, Università degli Studi di Milano, Via Celoria 26, 20133, Milan, Italy
- Istituto di Ricerca sulle Acque, IRSA-CNR, Via del Mulino 19, 20861, Brugherio, MB, Italy
| | | | - Renato Casagrandi
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico Di Milano, Via Ponzio 34/5, 20131, Milan, Italy.
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Sergio F, Barbosa JM, Tanferna A, Silva R, Blas J, Hiraldo F. Compensation for wind drift during raptor migration improves with age through mortality selection. Nat Ecol Evol 2022; 6:989-997. [PMID: 35680999 DOI: 10.1038/s41559-022-01776-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 04/20/2022] [Indexed: 11/09/2022]
Abstract
Each year, billions of flying and swimming migrants negotiate the challenging displacement imposed by travelling through a flowing medium. However, little is known about how the ability to cope with drift improves through life and what mechanisms drive its development. We examined 3,140 days of migration by 90 GPS-tagged raptorial black kites (Milvus migrans) aged 1-27 years to show that the ability to compensate for lateral drift develops gradually through many more years than previously appreciated. Drift negotiation was under strong selective pressure, with inferior navigators subject to increased mortality. This progressively selected for adults able to compensate for current cross flows and for previously accumulated drift in a flexible, context-dependent and risk-dependent manner. Displacements accumulated en route carried over to shape the wintering distribution of the population. For many migrants, migratory journeys by younger individuals represent concentrated episodes of trait selection that shape adult populations and mediate their adaptation to climate change.
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Affiliation(s)
- Fabrizio Sergio
- Department of Conservation Biology, Estación Biológica de Doñana-CSIC, Seville, Spain.
| | - Jomar M Barbosa
- Department of Applied Biology, Universidad Miguel Hernández, Elche, Spain
| | - Alessandro Tanferna
- Department of Conservation Biology, Estación Biológica de Doñana-CSIC, Seville, Spain
| | - Rafa Silva
- Department of Conservation Biology, Estación Biológica de Doñana-CSIC, Seville, Spain
| | - Julio Blas
- Department of Conservation Biology, Estación Biológica de Doñana-CSIC, Seville, Spain
| | - Fernando Hiraldo
- Department of Conservation Biology, Estación Biológica de Doñana-CSIC, Seville, Spain
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Snell KRS, Thorup K. Modeling Complex Seasonal Avian Migration: Predictions From the Thermal Environment and Resource Availability. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.824641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Billions of birds undertake long-distance migration and the complexity of schedules has only recently become clear. Such movements occur as a response to seasonality but the ultimate drivers of these changing distributions remain difficult to study directly. Modeling seasonal distributions based fundamentally on climate and vegetation without parameterizing with empirical data, we focus on the potential role of ambient temperature and available resources in shaping the migratory program. We simulate the complete annual cycle over the Afro-Palearctic region in a round-trip migration model allowing full variation in the extent and timing of movement, and multiple stopovers. The resultant simulated tracks and associated environmental metrics are interrogated: we evaluate the thermal and resource consequences of staying in Europe versus crossing the Sahara, and secondly identify the movement patterns optimizing exposure to green vegetation and local surpluses. There is a distinct thermal gain from crossing the Sahara and the pattern emerging of optimal seasonal vegetation resembles contemporary migration routes regarding Sahara crossing, loop structure and itinerancy. Thus, our first-principle simulations suggest that variations in migration patterns among species are caused by a complex trade-off between risks and rewards of staying versus moving, including innate physiological constraints and the resultant gain of the high-risk Sahara crossing.
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9
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Panter CT, Literák I, Raab R, Tolhurst BA, White RL. Age, landscape, and arrival date explain ranging behavior of wintering red kites in southwest Europe. J Wildl Manage 2021. [DOI: 10.1002/jwmg.22147] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Connor T. Panter
- Ecology, Conservation and Zoonosis Research and Enterprise Group, School of Applied Sciences University of Brighton Brighton BN2 4GJ United Kingdom
| | - Ivan Literák
- Department of Biology and Wildlife Diseases, Faculty of Veterinary Hygiene and Ecology University of Veterinary and Pharmaceutical Sciences Brno Brno Czech Republic
| | - Rainer Raab
- Technisches Büro für Biologie Mag. Dr. Rainer Raab Quadenstrasse 13, 2232 Deutsch‐Wagram Austria
| | - Bryony A. Tolhurst
- Ecology, Conservation and Zoonosis Research and Enterprise Group, School of Applied Sciences University of Brighton Brighton BN2 4GJ United Kingdom
| | - Rachel L. White
- Ecology, Conservation and Zoonosis Research and Enterprise Group, School of Applied Sciences University of Brighton Brighton BN2 4GJ United Kingdom
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Meierhofer MB, Leivers SJ, Pierce BL, Powers GW, Evans JW, Morrison ML. Structural and environmental predictors of tricolored bat presence and abundance in Texas caves. J Mammal 2021. [DOI: 10.1093/jmammal/gyab143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
The identification of bat colonies is essential to conserve and manage these globally threatened mammals. Caves offer potential roosting locations (hibernacula) to hibernating bat species; however, identifying regions where bat-occupied caves exist can be time-consuming. In Texas, caves are often on privately owned land, creating difficulties for accessing and managing potential hibernacula. The tricolored bat (Perimyotis subflavus), a species susceptible to white-nose syndrome, hibernates in caves in the winter in Texas. We sought to identify and quantify site-specific structural and environmental features that influence the presence and abundance of overwintering tricolored bats. We surveyed caves for bats and recorded environmental and structural features of 116 caves January–February 2016, December–February 2016–2017, January–February 2018, and December–February 2018–2019. We used a zero-inflated Poisson regression to identify which features best explained the presence and abundance of tricolored bats. We found that bat presence increased as cave length decreased, and as Normalized Difference Vegetation Index (NDVI) and external vapor pressure deficit increased. Bat abundance increased as number of portals, cave length, NDVI, and external temperature increased. Combining surface data with subsurface features can assist with identifying specific karst regions and known caves within those regions for survey and management efforts.
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Affiliation(s)
- Melissa B Meierhofer
- Department of Rangeland, Wildlife and Fisheries Management, Texas A&M University, College Station, TX, USA
- Natural Resources Institute, Texas A&M University, College Station, TX, USA
| | - Samantha J Leivers
- Natural Resources Institute, Texas A&M University, College Station, TX, USA
| | - Brian L Pierce
- Natural Resources Institute, Texas A&M University, College Station, TX, USA
| | - Garrett W Powers
- Natural Resources Institute, Texas A&M University, College Station, TX, USA
| | - Jonah W Evans
- Wildlife Diversity Program, Texas Parks and Wildlife Department, Boerne, TX, USA
| | - Michael L Morrison
- Department of Rangeland, Wildlife and Fisheries Management, Texas A&M University, College Station, TX, USA
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Finlayson S, Holmes TL, Finlayson G, Guillem R, Perez C, Bensusan K, Finlayson C. Birds with multiple homes. The annual cycle of the pallid swift (Apus pallidus brehmorum). PLoS One 2021; 16:e0259656. [PMID: 34847150 PMCID: PMC8631615 DOI: 10.1371/journal.pone.0259656] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 10/24/2021] [Indexed: 11/24/2022] Open
Abstract
We tracked pallid swifts (Apus pallidus brehmorum) from a single breeding colony in Gibraltar over two years. Our results show movement of birds between specific regions within the non-breeding geographical area at specific times of the year. The tracking of a single individual showed remarkable fidelity to the areas visited between years. Furthermore, two pallid swifts tracked over the entire eight-month non-breeding period, while in Africa, gave no indication of coming to land, supporting previous findings of an airborne existence in swifts outside the breeding season. In addition, the crossing of the Sahara Desert to and from breeding grounds is remarkably fast, with one individual crossing it in just over a day. We discuss our findings in the context of bird migration evolutionary strategies.
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Affiliation(s)
- Stewart Finlayson
- The Gibraltar National Museum, Gibraltar, United Kingdom
- Institute of Life and Earth Sciences, The University of Gibraltar, Gibraltar, United Kingdom
| | - Tyson Lee Holmes
- The Gibraltar National Museum, Gibraltar, United Kingdom
- Institute of Life and Earth Sciences, The University of Gibraltar, Gibraltar, United Kingdom
| | - Geraldine Finlayson
- The Gibraltar National Museum, Gibraltar, United Kingdom
- Institute of Life and Earth Sciences, The University of Gibraltar, Gibraltar, United Kingdom
- Department of Life Sciences, Liverpool John Moores University, Liverpool, United Kingdom
- * E-mail:
| | - Rhian Guillem
- Institute of Life and Earth Sciences, The University of Gibraltar, Gibraltar, United Kingdom
- Gibraltar Botanic Gardens, ‘The Alameda’, Gibraltar, United Kingdom
| | - Charles Perez
- Gibraltar Ornithological and Natural History Society, Gibraltar, United Kingdom
| | - Keith Bensusan
- Institute of Life and Earth Sciences, The University of Gibraltar, Gibraltar, United Kingdom
- Gibraltar Botanic Gardens, ‘The Alameda’, Gibraltar, United Kingdom
| | - Clive Finlayson
- The Gibraltar National Museum, Gibraltar, United Kingdom
- Institute of Life and Earth Sciences, The University of Gibraltar, Gibraltar, United Kingdom
- Department of Life Sciences, Liverpool John Moores University, Liverpool, United Kingdom
- Department of Social Sciences, University of Toronto Scarborough, Toronto, Canada
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Changes in surface water drive the movements of Shoebills. Sci Rep 2021; 11:15796. [PMID: 34349159 PMCID: PMC8338928 DOI: 10.1038/s41598-021-95093-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 07/05/2021] [Indexed: 02/07/2023] Open
Abstract
Animal movement is mainly determined by spatial and temporal changes in resource availability. For wetland specialists, the seasonal availability of surface water may be a major determinant of their movement patterns. This study is the first to examine the movements of Shoebills (Balaeniceps rex), an iconic and vulnerable bird species. Using GPS transmitters deployed on six immature and one adult Shoebills over a 5-year period, during which four immatures matured into adults, we analyse their home ranges and distances moved in the Bangweulu Wetlands, Zambia. We relate their movements at the start of the rainy season (October to December) to changes in Normalized Difference Water Index (NDWI), a proxy for surface water. We show that Shoebills stay in the Bangweulu Wetlands all year round, moving less than 3 km per day on 81% of days. However, average annual home ranges were large, with high individual variability, but were similar between age classes. Immature and adult Shoebills responded differently to changes in surface water; sites that adults abandoned became drier, while sites abandoned by immatures became wetter. However, there were no differences in NDWI of areas used by Shoebills before abandonment and newly selected sites, suggesting that Shoebills select areas with similar surface water. We hypothesise that the different responses to changes in surface water by immature and adult Shoebills are related to age-specific optimal foraging conditions and fishing techniques. Our study highlights the need to understand the movements of Shoebills throughout their life cycle to design successful conservation actions for this emblematic, yet poorly known, species.
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Stanley CQ, Dudash MR, Ryder TB, Gregory Shriver W, Marra PP. Variable tropical moisture and food availability underlie mixed winter space-use strategies in a migratory songbird. Proc Biol Sci 2021; 288:20211220. [PMID: 34284621 PMCID: PMC8292764 DOI: 10.1098/rspb.2021.1220] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Accepted: 06/30/2021] [Indexed: 11/20/2022] Open
Abstract
Identifying environmental correlates driving space-use strategies can be critical for predicting population dynamics; however, such information can be difficult to attain for small mobile species such as migratory songbirds. We combined radio-telemetry and high-resolution GPS tracking to examine space-use strategies under different moisture gradients for wood thrush (Hylocichla mustelina). We explored the role moisture plays in driving food abundance and, in turn, space-use strategies at a wintering site in Belize across 3 years. Individuals occupying drier habitats experienced lower food abundance and poorer body condition. Using data from our radio-tracked study population and GPS tracking from across five breeding populations, we detected low rates of overwinter site persistence across the wood thrush wintering range. Contrary to expectations, individuals in wetter habitats were more likely to engage in permanent mid-winter relocations, up to 148 km. We suggest facultative movements are instead a condition-dependent strategy that enables wintering wood thrush to locate alternative habitat as food availability declines throughout the dry season. Increased aridity is predicted across the wintering range of wood thrush, and future research should delve deeper into understanding how moisture impacts within and between season space-use dynamics and its ultimate impact on the population dynamics of this declining species.
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Affiliation(s)
- Calandra Q. Stanley
- Migratory Bird Center, Smithsonian Conservation Biology Institute, Washington, DC 20008, USA
- Graduate Program in Behaviour, Ecology, Evolution, and Systematics, University of Maryland, College Park, MD 20742, USA
- Department of Biology and McCourt School of Public Policy, Georgetown University, 37th and O Streets NW, Washington, DC 20057, USA
| | - Michele R. Dudash
- Department of Natural Resource Management, South Dakota State University, Brookings, SD 57007, USA
| | - Thomas B. Ryder
- Migratory Bird Center, Smithsonian Conservation Biology Institute, Washington, DC 20008, USA
- Bird Conservancy of the Rockies, 230 Cherry Street, Suite 150, Fort Collins, CO 80521, USA
| | - W. Gregory Shriver
- Department of Entomology and Wildlife Ecology, University of Delaware, Newark, DE 19716, USA
| | - Peter P. Marra
- Migratory Bird Center, Smithsonian Conservation Biology Institute, Washington, DC 20008, USA
- Department of Biology and McCourt School of Public Policy, Georgetown University, 37th and O Streets NW, Washington, DC 20057, USA
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Stoner DC, Messmer TA, Larsen RT, Frey SN, Kohl MT, Thacker ET, Dahlgren DK. Using satellite-derived estimates of plant phenological rhythms to predict sage-grouse nesting chronology. Ecol Evol 2020; 10:11169-11182. [PMID: 33144957 PMCID: PMC7593141 DOI: 10.1002/ece3.6758] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 07/27/2020] [Accepted: 08/04/2020] [Indexed: 11/10/2022] Open
Abstract
The "green wave" hypothesis posits that during spring consumers track spatial gradients in emergent vegetation and associated foraging opportunities. This idea has largely been invoked to explain animal migration patterns, yet the general phenomenon underlies trends in vertebrate reproductive chronology as well. We evaluated the utility of this hypothesis for predicting spatial variation in nest initiation of greater sage-grouse (Centrocerus urophasianus), a species of conservation concern in western North America. We used the Normalized Difference Vegetation Index (NDVI) to map the green wave across elevation and then compiled dates and locations of >450 sage-grouse nests from 20 study sites (2000-2014) to model nest initiation as a function of the start of the growing season (SOS), defined here as the maximum daily rate of increase in NDVI. Individual sites were drawn from three ecoregions, distributed over 4.5° latitude, and spanning 2,300 m in elevation, which captured the climatic, edaphic, and floristic diversity of sagebrush ecosystems in the southern half of current sage-grouse range. As predicted, SOS displayed a significant, positive relationship with elevation, occurring 1.3 days later for each 100 m increase in elevation. In turn, sage-grouse nest initiation followed SOS by 22 ± 10 days (r2 = .57), with hatch dates falling on or just prior to the peak of the growing season. By timing nesting to the green wave, sage-grouse chicks hatched when the abundance of protein-rich invertebrate biomass is hypothesized to be nearing a seasonal high. This adaptation likely represents a strategy for maximizing reproductive success in the arid, variable environments that define sagebrush ecosystems. Given projected changes in climate and land use, these results can be used to predict periods of relative sensitivity to habitat disturbance for sage-grouse. Moreover, the near real-time availability of satellite imagery offers a heretofore underutilized means of mapping the green wave, planning habitat restoration, and monitoring range conditions.
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Affiliation(s)
- David C. Stoner
- Department of Wildland ResourcesUtah State UniversityLoganUTUSA
| | | | - Randy T. Larsen
- Department of Plant and Wildlife SciencesBrigham Young UniversityProvoUTUSA
| | | | - Michel T. Kohl
- Warnell School of Forestry and Natural ResourcesUniversity of GeorgiaAthensGAUSA
| | - Eric T. Thacker
- Department of Wildland ResourcesUtah State UniversityLoganUTUSA
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15
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Fernández-Tizón M, Emmenegger T, Perner J, Hahn S. Arthropod biomass increase in spring correlates with NDVI in grassland habitat. Naturwissenschaften 2020; 107:42. [PMID: 32970225 DOI: 10.1007/s00114-020-01698-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 09/07/2020] [Accepted: 09/14/2020] [Indexed: 10/23/2022]
Abstract
Data from remote sensing are often used as proxies to quantify biological processes, especially at large geographical scales. The normalized difference vegetation index (NDVI) is the most frequently used proxy for primary productivity. Assuming a direct, positive interrelation between primary and secondary production in terrestrial habitats, NDVI is often used to predict food availability for higher trophic levels. However, the relationship between NDVI and arthropod biomass has rarely been tested. In this study, we analyzed extensive datasets of arthropod communities from semi-natural grasslands in central Europe to test the relationship between arthropod biomass of consumer trophic levels ("herbivores," "mixed," and "carnivores") in grassland communities and NDVI during the spring season. We found that arthropod biomass generally increased with NDVI. The same positive relationship between biomass and NDVI was observed for each individual trophic level. Cross-correlation analyses did not show statistically significant lags between the NDVI and biomass of herbivores and carnivores. All in all, our study provides correlational evidence for the positive relation of primary and secondary productivity in temperate terrestrial habitats during spring. Moreover, it supports the applicability of NDVI data as a suitable habitat-specific proxy for the food availability of insectivores during spring.
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Affiliation(s)
- Mario Fernández-Tizón
- Department of Bird Migration, Swiss Ornithological Institute, CH 6204, Sempach, Switzerland. .,Department of Biology, Geology, Physics and Inorganic Chemistry, University Rey Juan Carlos, Móstoles, Spain.
| | - Tamara Emmenegger
- Department of Bird Migration, Swiss Ornithological Institute, CH 6204, Sempach, Switzerland
| | - Jörg Perner
- U.A.S. Umwelt- und Agrarstudien GmbH, 07743, Jena, Germany
| | - Steffen Hahn
- Department of Bird Migration, Swiss Ornithological Institute, CH 6204, Sempach, Switzerland
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16
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DeSantis DL, Mata-Silva V, Johnson JD, Wagler AE. Integrative Framework for Long-Term Activity Monitoring of Small and Secretive Animals: Validation With a Cryptic Pitviper. Front Ecol Evol 2020. [DOI: 10.3389/fevo.2020.00169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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17
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Chaiyes A, Escobar LE, Willcox EV, Duengkae P, Suksavate W, Watcharaanantapong P, Pongpattananurak N, Wacharapluesadee S, Hemachudha T. An assessment of the niche centroid hypothesis:
Pteropus lylei
(Chiroptera). Ecosphere 2020. [DOI: 10.1002/ecs2.3134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Aingorn Chaiyes
- Special Research Unit for Wildlife Genomics Department of Forest Biology Faculty of Forestry Kasetsart University Bangkok 10900 Thailand
- Center for Advanced Studies in Tropical Natural Resources Kasetsart University Chatuchak Bangkok 10900 Thailand
| | - Luis E. Escobar
- Department of Fish and Wildlife Conservation Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 USA
| | - Emma V. Willcox
- Department of Forestry, Wildlife and Fisheries University of Tennessee Knoxville Tennessee 37996 USA
| | - Prateep Duengkae
- Special Research Unit for Wildlife Genomics Department of Forest Biology Faculty of Forestry Kasetsart University Bangkok 10900 Thailand
- Center for Advanced Studies in Tropical Natural Resources Kasetsart University Chatuchak Bangkok 10900 Thailand
| | - Warong Suksavate
- Special Research Unit for Wildlife Genomics Department of Forest Biology Faculty of Forestry Kasetsart University Bangkok 10900 Thailand
- Center for Advanced Studies in Tropical Natural Resources Kasetsart University Chatuchak Bangkok 10900 Thailand
| | | | - Nantachai Pongpattananurak
- Special Research Unit for Wildlife Genomics Department of Forest Biology Faculty of Forestry Kasetsart University Bangkok 10900 Thailand
| | - Supaporn Wacharapluesadee
- Thai Red Cross Emerging Infectious Diseases – Health Science Centre World Health Organization Collaborating Centre for Research and Training on Viral Zoonoses King Chulalongkorn Memorial Hospital Faculty of Medicine Chulalongkorn University Patumwan Bangkok 10330 Thailand
| | - Thiravat Hemachudha
- Thai Red Cross Emerging Infectious Diseases – Health Science Centre World Health Organization Collaborating Centre for Research and Training on Viral Zoonoses King Chulalongkorn Memorial Hospital Faculty of Medicine Chulalongkorn University Patumwan Bangkok 10330 Thailand
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18
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Marcelino J, Silva JP, Gameiro J, Silva A, Rego FC, Moreira F, Catry I. Extreme events are more likely to affect the breeding success of lesser kestrels than average climate change. Sci Rep 2020; 10:7207. [PMID: 32350294 PMCID: PMC7190627 DOI: 10.1038/s41598-020-64087-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 04/02/2020] [Indexed: 11/25/2022] Open
Abstract
Climate change is predicted to severely impact interactions between prey, predators and habitats. In Southern Europe, within the Mediterranean climate, herbaceous vegetation achieves its maximum growth in middle spring followed by a three-month dry summer, limiting prey availability for insectivorous birds. Lesser kestrels (Falco naumanni) breed in a time-window that matches the nestling-rearing period with the peak abundance of grasshoppers and forecasted climate change may impact reproductive success through changes in prey availability and abundance. We used Normalised Difference Vegetation Index (NDVI) as a surrogate of habitat quality and prey availability to investigate the impacts of forecasted climate change and extreme climatic events on lesser kestrel breeding performance. First, using 14 years of data from 15 colonies in Southwestern Iberia, we linked fledging success and climatic variables with NDVI, and secondly, based on these relationships and according to climatic scenarios for 2050 and 2070, forecasted NDVI and fledging success. Finally, we evaluated how fledging success was influenced by drought events since 2004. Despite predicting a decrease in vegetation greenness in lesser kestrel foraging areas during spring, we found no impacts of predicted gradual rise in temperature and decline in precipitation on their fledging success. Notwithstanding, we found a decrease of 12% in offspring survival associated with drought events, suggesting that a higher frequency of droughts might, in the future, jeopardize the recent recovery of the European population. Here, we show that extreme events, such as droughts, can have more significant impacts on species than gradual climatic changes, especially in regions like the Mediterranean Basin, a biodiversity and climate change hotspot.
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Affiliation(s)
- J Marcelino
- Centre for Applied Ecology "Prof. Baeta Neves"/InBIO Associate Laboratory, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017, Lisboa, Portugal.
| | - J P Silva
- CIBIO/InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Laboratório Associado, Universidade do Porto, Campus Agrário de Vairão, 4485-601, Vairão, Portugal
- CIBIO/InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Instituto Superior de Agronomia, Laboratório Associado, Universidade de Lisboa, Tapada da Ajuda, 1349-017, Lisboa, Portugal
- REN Biodiversity Chair, CIBIO/InBIO-UP, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto, Campus Agrário de Vairão, Rua Padre Armando Quintas, 4485-601, Vairão, Portugal
| | - J Gameiro
- cE3c, Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal
| | - A Silva
- Instituto Português do Mar e da Atmosfera, I.P., Rua C do Aeroporto, 1749-077, Lisboa, Portugal
| | - F C Rego
- Centre for Applied Ecology "Prof. Baeta Neves"/InBIO Associate Laboratory, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017, Lisboa, Portugal
| | - F Moreira
- CIBIO/InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Instituto Superior de Agronomia, Laboratório Associado, Universidade de Lisboa, Tapada da Ajuda, 1349-017, Lisboa, Portugal
- REN Biodiversity Chair, CIBIO/InBIO-UP, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto, Campus Agrário de Vairão, Rua Padre Armando Quintas, 4485-601, Vairão, Portugal
| | - I Catry
- CIBIO/InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Laboratório Associado, Universidade do Porto, Campus Agrário de Vairão, 4485-601, Vairão, Portugal
- CIBIO/InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Instituto Superior de Agronomia, Laboratório Associado, Universidade de Lisboa, Tapada da Ajuda, 1349-017, Lisboa, Portugal
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19
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Hadjikyriakou TG, Nwankwo EC, Virani MZ, Kirschel ANG. Habitat availability influences migration speed, refueling patterns and seasonal flyways of a fly-and-forage migrant. MOVEMENT ECOLOGY 2020; 8:10. [PMID: 32082577 PMCID: PMC7017632 DOI: 10.1186/s40462-020-0190-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 01/05/2020] [Indexed: 05/08/2023]
Abstract
BACKGROUND Despite our understanding of the principal factors that shape bird migration strategies, there is conflicting evidence regarding the role of habitat in shaping migration routes and schedules, including day and night activity and differences between autumn and spring. For fly-and-forage migrants, we predict that habitat characteristics might guide migration speed, route selection and migrating schedules. METHODS We use solar-powered GPS transmitters, obtaining high accuracy data, to monitor the migratory movements of Eleonora's falcon breeding in Cyprus, which is the easternmost breeding population of the species. We tested for potential preferences in habitat characteristics along the migration routes, separately for the northern, drier part and the more vegetated southern part of the trips. We also examined the relationship between migration speed and vegetative cover during day and at night, accounting for wind support. RESULTS We found that tagged individuals repeatedly exhibited an anticlockwise loop migration pattern with spring routes being more easterly than autumn ones. We identified a preference for migration through vegetation-rich areas, where during daytime tagged individuals travel at slower migration speeds compared to vegetation-poor areas, indicating fly-and-forage activity. Birds roosted during most nights, combining refueling stopovers at selected vegetation-rich areas before or after crossing ecological barriers. Conversely, both during day and night, tagged individuals overflew unsuitable habitats more quickly. CONCLUSIONS Our results suggest that habitat is an important factor in Eleonora's falcon migratory strategies. Active selection of vegetation rich areas in combination with reduced migration speeds there, allows the migrating falcons to combine migration during the day with fly-and-forage refueling, while roosting most nights.
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Affiliation(s)
| | - Emmanuel C. Nwankwo
- Department of Biological Sciences, University of Cyprus, PO Box 20537, 1678 Nicosia, Cyprus
| | - Munir Z. Virani
- The Peregrine Fund, 5668 West Flying Hawk Lane, Boise, ID 83709 USA
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20
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Territoriality and variation in home range size through the entire annual range of migratory great spotted cuckoos (Clamator glandarius). Sci Rep 2019; 9:6238. [PMID: 30996232 PMCID: PMC6470221 DOI: 10.1038/s41598-019-41943-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 02/11/2019] [Indexed: 11/08/2022] Open
Abstract
Variation in home range size throughout the year and its causes are not well understood yet. Migratory brood parasites offer a unique opportunity to incorporate this spatio-temporal dimension into the study of the factors regulating home range dynamics. Using satellite transmitters, we tracked sixteen migratory great spotted cuckoos (Clamator glandarius) of both sexes for up to three years. We constructed home ranges in all major staging areas, from the Spanish breeding areas to the African wintering grounds, analyzed their temporal and geographical variation and investigated their main potential determinants (e.g. food and host availability). We found that home ranges were significantly larger in the breeding area compared to non-breeding areas. Using NDVI as a proxy for food availability, we showed that breeding area home ranges have significantly lower food availability per km2 than home ranges elsewhere which could explain why cuckoos use alternative areas with higher food availability before initiating migration. We also found some evidence for sex differences. Additionally, we found no indications of territoriality in this species, providing novel information into the current debate on brood parasite territoriality. Overall, food availability seems to be an important factor regulating home range dynamics and influencing migratory patterns throughout the year in great spotted cuckoos.
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21
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van Bemmelen RSA, Kolbeinsson Y, Ramos R, Gilg O, Alves JA, Smith M, Schekkerman H, Lehikoinen A, Petersen IK, Þórisson B, Sokolov AA, Välimäki K, van der Meer T, Okill JD, Bolton M, Moe B, Hanssen SA, Bollache L, Petersen A, Thorstensen S, González-Solís J, Klaassen RHG, Tulp I. A Migratory Divide Among Red-Necked Phalaropes in the Western Palearctic Reveals Contrasting Migration and Wintering Movement Strategies. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00086] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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22
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Garcia-Heras MS, Arroyo B, Mougeot F, Bildstein K, Therrien JF, Simmons RE. Migratory patterns and settlement areas revealed by remote sensing in an endangered intra-African migrant, the Black Harrier (Circus maurus). PLoS One 2019; 14:e0210756. [PMID: 30653592 PMCID: PMC6336274 DOI: 10.1371/journal.pone.0210756] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 12/21/2018] [Indexed: 11/25/2022] Open
Abstract
Annual movements have been widely described for birds migrating across the Americas and between Eurasia and Africa, yet relatively little information exists for intra-African migrants. Identifying the areas used throughout a species annual cycle by understanding migratory patterns and settlement areas during breeding and non-breeding seasons is essential for conservation initiatives. Here, we describe for the first time, the migratory patterns and settlement areas of an endangered raptor endemic to Southern Africa, the Black Harrier (Circus maurus). From 2008 to 2015, thirteen breeding adult Black Harriers were trapped in south-western South Africa and fitted either with a GPS-GSM or with a PTT tracker device. Adults were monitored for 365 ± 198 days (range: 56–819 days) revealing great individual variability in annual movements. Most Black Harriers performed an unusual West-East migration from their breeding areas, but routes of all migrating individuals covered the entire southern land area of South Africa and Lesotho. The distance travelled averaged 814 ± 324 km, but unlike many other species, migrants travelled faster during post-breeding (i.e. austral summer) (207.8 ± 113.2 km.day-1) than during pre-breeding (i.e. austral winter/spring) migrations (143.8 ± 32.2 km.day-1). Although most marked individuals displayed movements similar to those that bred following pre-breeding migrations, only two of thirteen were confirmed as breeders the year after being tagged. This suggests that individuals may sometimes take a sabbatical year in reproduction, although this requires confirmation. Most tagged birds died on migration or during the non-breeding season. Adults frequently returned to the same non-breeding settlement areas, and often used up to 3 different locations an average of about 200 km apart. On the other hand, there was wide variation in distance between subsequent reproductive events. We discuss the implications of our study for the conservation of Black Harriers and more broadly for intra-African bird migrants.
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Affiliation(s)
- Marie-Sophie Garcia-Heras
- Department of Forest Ecosystems and Society, Oregon State University, Corvallis, United States of America
- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, South Africa
- * E-mail:
| | - Beatriz Arroyo
- Instituto de Investigación en Recursos Cinegéticos (IREC), CSIC-UCLM-JCCM, Ciudad Real, Spain
| | - François Mougeot
- Instituto de Investigación en Recursos Cinegéticos (IREC), CSIC-UCLM-JCCM, Ciudad Real, Spain
| | - Keith Bildstein
- Hawk Mountain Sanctuary, Acopian Center for Conservation Learning, Orwigsburg, United States of America
| | - Jean-François Therrien
- Hawk Mountain Sanctuary, Acopian Center for Conservation Learning, Orwigsburg, United States of America
| | - Robert E. Simmons
- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, South Africa
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23
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Norevik G, Boano G, Hedenström A, Lardelli R, Liechti F, Åkesson S. Highly mobile insectivorous swifts perform multiple intra‐tropical migrations to exploit an asynchronous African phenology. OIKOS 2018. [DOI: 10.1111/oik.05531] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gabriel Norevik
- Dept of Biology, Centre for Animal Movement Research, Lund Univ., Ecology Building SE‐223 62 Lund Sweden
| | - Giovanni Boano
- Museo Civico di Storia Naturale, C.na Vigna Carmagnola TO Italy
| | - Anders Hedenström
- Dept of Biology, Centre for Animal Movement Research, Lund Univ., Ecology Building SE‐223 62 Lund Sweden
| | | | - Felix Liechti
- Swiss Ornithological Inst., Bird Migration Sempach Switzerland
| | - Susanne Åkesson
- Dept of Biology, Centre for Animal Movement Research, Lund Univ., Ecology Building SE‐223 62 Lund Sweden
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24
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Kiat Y, Izhaki I, Sapir N. The effects of long-distance migration on the evolution of moult strategies in Western-Palearctic passerines. Biol Rev Camb Philos Soc 2018; 94:700-720. [PMID: 30334341 DOI: 10.1111/brv.12474] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2017] [Revised: 09/16/2018] [Accepted: 09/25/2018] [Indexed: 01/19/2023]
Abstract
Although feathers are the unifying characteristic of all birds, our understanding of the causes, mechanisms, patterns and consequences of the feather moult process lags behind that of other major avian life-history phenomena such as reproduction and long-distance migration. Migration, which evolved in many species of the temperate and arctic zones, requires high energy expenditure to endure long-distance journeys. About a third of Western-Palearctic passerines perform long-distance migrations of thousands of kilometres each year using various morphological, physiological, biomechanical, behavioural and life-history adaptations. The need to include the largely non-overlapping breeding, long-distance migration and feather moult processes within the annual cycle imposes a substantial constraint on the time over which the moult process can take place. Here, we review four feather-moult-related adaptations which, likely due to time constraints, evolved among long-distance Western-Palearctic migrants: (i) increased moult speed; (ii) increased overlap between moult and breeding or migration; (iii) decreased extent of plumage moult; and (iv) moult of part or all of the plumage during the over-wintering period in the tropics rather than in the breeding areas. We suggest that long-distance migration shaped the evolution of moult strategies and increased the diversity of these strategies among migratory passerines. In contrast to this variation, all resident passerines in the Western Palearctic moult immediately after breeding by renewing the entire plumage of adults and in some species also juveniles, while in other species juvenile moult is partial. We identify important gaps in our current understanding of the moult process that should be addressed in the future. Notably, previous studies suggested that the ancestral moult strategy is a post-breeding summer moult in the Western Palearctic breeding areas and that moult during the winter evolved due to the scheduling of long-distance migration immediately after breeding. We offer an alternative hypothesis based on the notion of southern ancestry, proposing that the ancestral moult strategy was a complete moult during the 'northern winter' in the Afro-tropical region in these species, for both adults and juveniles. An important aspect of the observed variation in moult strategies relates to their control mechanisms and we suggest that there is insufficient knowledge regarding the physiological mechanisms that are involved, and whether they are genetically fixed or shaped by environmental factors. Finally, research effort is needed on how global climate changes may influence avian annual routines by altering the scheduling of major processes such as long-distance migration and feather moult.
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Affiliation(s)
- Yosef Kiat
- Department of Evolutionary and Environmental Biology and Institute of Evolution, University of Haifa 199 Aba Khoushy Avenue, Mount Carmel 3498838, Haifa, Israel
| | - Ido Izhaki
- Department of Evolutionary and Environmental Biology and Institute of Evolution, University of Haifa 199 Aba Khoushy Avenue, Mount Carmel 3498838, Haifa, Israel
| | - Nir Sapir
- Department of Evolutionary and Environmental Biology and Institute of Evolution, University of Haifa 199 Aba Khoushy Avenue, Mount Carmel 3498838, Haifa, Israel
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25
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Dominoni DM, Åkesson S, Klaassen R, Spoelstra K, Bulla M. Methods in field chronobiology. Philos Trans R Soc Lond B Biol Sci 2018; 372:rstb.2016.0247. [PMID: 28993491 DOI: 10.1098/rstb.2016.0247] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/08/2017] [Indexed: 11/12/2022] Open
Abstract
Chronobiological research has seen a continuous development of novel approaches and techniques to measure rhythmicity at different levels of biological organization from locomotor activity (e.g. migratory restlessness) to physiology (e.g. temperature and hormone rhythms, and relatively recently also in genes, proteins and metabolites). However, the methodological advancements in this field have been mostly and sometimes exclusively used only in indoor laboratory settings. In parallel, there has been an unprecedented and rapid improvement in our ability to track animals and their behaviour in the wild. However, while the spatial analysis of tracking data is widespread, its temporal aspect is largely unexplored. Here, we review the tools that are available or have potential to record rhythms in the wild animals with emphasis on currently overlooked approaches and monitoring systems. We then demonstrate, in three question-driven case studies, how the integration of traditional and newer approaches can help answer novel chronobiological questions in free-living animals. Finally, we highlight unresolved issues in field chronobiology that may benefit from technological development in the future. As most of the studies in the field are descriptive, the future challenge lies in applying the diverse technologies to experimental set-ups in the wild.This article is part of the themed issue 'Wild clocks: integrating chronobiology and ecology to understand timekeeping in free-living animals'.
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Affiliation(s)
- Davide M Dominoni
- Department of Animal Ecology, Netherlands Institute of Ecology, PO Box 50, 6700 AB, Wageningen, The Netherlands .,Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow G128QQ, UK
| | - Susanne Åkesson
- Centre for Animal Movement Research, Department of Biology, Lund University, Lund 22362, Sweden
| | - Raymond Klaassen
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen 9747 AG, The Netherlands
| | - Kamiel Spoelstra
- Department of Animal Ecology, Netherlands Institute of Ecology, PO Box 50, 6700 AB, Wageningen, The Netherlands
| | - Martin Bulla
- Department of Behavioural Ecology and Evolutionary Genetics, Max Planck Institute for Ornithology, Seewiesen 82319, Germany.,NIOZ Royal Netherlands Institute for Sea Research, Department of Coastal Systems, Utrecht University, PO Box 59, 1790 AB Den Burg, The Netherlands.,Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Prague 16521, Czech Republic
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26
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Yoshioka A, Fukasawa K, Mishima Y, Sasaki K, Kadoya T. Ecological dissimilarity among land-use/land-cover types improves a heterogeneity index for predicting biodiversity in agricultural landscapes. AMBIO 2017; 46:894-906. [PMID: 28573598 PMCID: PMC5639797 DOI: 10.1007/s13280-017-0925-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 03/07/2017] [Accepted: 05/23/2017] [Indexed: 06/07/2023]
Abstract
Land-use/land-cover heterogeneity is among the most important factors influencing biodiversity in agricultural landscapes and is the key to the conservation of multi-habitat dwellers that use both terrestrial and aquatic habitats. Heterogeneity indices based on land-use/land-cover maps typically do not integrate ecological dissimilarity between land-use/land-cover types. Here, we applied the concept of functional diversity to an existing land-use/land-cover diversity index (Satoyama index) to incorporate ecological dissimilarity and proposed a new index called the dissimilarity-based Satoyama index (DSI). Using Japan as a case study, we calculated the DSI for three land-use/land-cover maps with different spatial resolutions and derived similarity information from normalized difference vegetation index values. The DSI showed better performance in the prediction of Japanese damselfly species richness than that of the existing index, and a higher correlation between the index and species richness was obtained for higher resolution maps. Thus, our approach to improve the land-use/land-cover diversity index holds promise for future development and can be effective for conservation and monitoring efforts.
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Affiliation(s)
- Akira Yoshioka
- Fukushima Branch, National Institute for Environmental Studies, 10-2 Fukasaku, Miharu, Fukushima 963-7700 Japan
| | - Keita Fukasawa
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506 Japan
| | - Yoshio Mishima
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506 Japan
| | - Keiko Sasaki
- Department of Animal Ecology and Systematics, Justus Liebig University Giessen, Heinrich-Buff Ring 26-32, Giessen, 35392 Germany
| | - Taku Kadoya
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506 Japan
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Åkesson S, Ilieva M, Karagicheva J, Rakhimberdiev E, Tomotani B, Helm B. Timing avian long-distance migration: from internal clock mechanisms to global flights. Philos Trans R Soc Lond B Biol Sci 2017; 372:20160252. [PMID: 28993496 PMCID: PMC5647279 DOI: 10.1098/rstb.2016.0252] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/29/2017] [Indexed: 11/12/2022] Open
Abstract
Migratory birds regularly perform impressive long-distance flights, which are timed relative to the anticipated environmental resources at destination areas that can be several thousand kilometres away. Timely migration requires diverse strategies and adaptations that involve an intricate interplay between internal clock mechanisms and environmental conditions across the annual cycle. Here we review what challenges birds face during long migrations to keep track of time as they exploit geographically distant resources that may vary in availability and predictability, and summarize the clock mechanisms that enable them to succeed. We examine the following challenges: departing in time for spring and autumn migration, in anticipation of future environmental conditions; using clocks on the move, for example for orientation, navigation and stopover; strategies of adhering to, or adjusting, the time programme while fitting their activities into an annual cycle; and keeping pace with a world of rapidly changing environments. We then elaborate these themes by case studies representing long-distance migrating birds with different annual movement patterns and associated adaptations of their circannual programmes. We discuss the current knowledge on how endogenous migration programmes interact with external information across the annual cycle, how components of annual cycle programmes encode topography and range expansions, and how fitness may be affected when mismatches between timing and environmental conditions occur. Lastly, we outline open questions and propose future research directions.This article is part of the themed issue 'Wild clocks: integrating chronobiology and ecology to understand timekeeping in free-living animals'.
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Affiliation(s)
- Susanne Åkesson
- Centre for Animal Movement Research, Department of Biology, Lund University, 223 62 Lund, Sweden
| | - Mihaela Ilieva
- Centre for Animal Movement Research, Department of Biology, Lund University, 223 62 Lund, Sweden
- Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
| | - Julia Karagicheva
- Department of Coastal Systems, NIOZ Royal Netherlands Institute for Sea Research and Utrecht University, 1790 AB Den Burg, Texel, The Netherlands
| | - Eldar Rakhimberdiev
- Department of Coastal Systems, NIOZ Royal Netherlands Institute for Sea Research and Utrecht University, 1790 AB Den Burg, Texel, The Netherlands
- Department of Vertebrate Zoology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Barbara Tomotani
- Netherlands Institute of Ecology, 6700 AB Wageningen, The Netherlands
| | - Barbara Helm
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow G128QQ, UK
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Lerche-Jørgensen M, Willemoes M, Tøttrup AP, Snell KRS, Thorup K. No apparent gain from continuing migration for more than 3000 kilometres: willow warblers breeding in Denmark winter across the entire northern Savannah as revealed by geolocators. MOVEMENT ECOLOGY 2017; 5:17. [PMID: 28861271 PMCID: PMC5576281 DOI: 10.1186/s40462-017-0109-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 08/21/2017] [Indexed: 05/28/2023]
Abstract
BACKGROUND For most Afro-Palearctic migrants, particularly small songbirds, spatiotemporal migration schedules and migratory connectivity remain poorly understood. We mapped migration from breeding through winter of one of the smallest Afro-Palearctic migrants, the willow warbler Phylloscopus trochilus, using geolocators (n = 15). RESULTS Birds migrated from North European breeding grounds to West Africa via the Iberian Peninsula following a narrow corridor along the West Coast of Africa. Birds then dispersed across the northern Savannah with termination of migration highly variable among individuals. The termination of migration appeared not to be related to timing, current and previous years' vegetation conditions or biometrics. During winter, most birds moved southwards to improved vegetation. CONCLUSION The willow warblers showed a large, unexpected longitudinal spread in winter sites of more than 3000 km between individuals breeding within a 500 m range resulting in a low degree of connectivity. The large wintering area may well be related to generalist behaviour in the species. Our findings contribute to understanding the link between breeding and wintering ecology in long-distance migratory birds.
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Affiliation(s)
- Mathilde Lerche-Jørgensen
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
| | - Mikkel Willemoes
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
| | - Anders P. Tøttrup
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
| | - Katherine Rachel Scotchburn Snell
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
| | - Kasper Thorup
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
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29
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Souchay G, van Wijk RE, Schaub M, Bauer S. Identifying drivers of breeding success in a long-distance migrant using structural equation modelling. OIKOS 2017. [DOI: 10.1111/oik.04247] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guillaume Souchay
- Swiss Ornithological Inst.; Sempach Switzerland
- ONCFS - DRE Unité Faune de Plaine, Parc d'Affaires la Rivière 8 Bd Albert Einstein Bât. B - CS 42355; FR-44323 Nantes France
| | - Rien E. van Wijk
- Swiss Ornithological Inst.; Sempach Switzerland
- Inst. of Evolutionary Biology and Environmental Studies, Univ. of Zürich; Zürich Switzerland
| | - Michael Schaub
- Swiss Ornithological Inst.; Sempach Switzerland
- Inst. of Ecology and Evolution, Division of Conservation Biology, Univ. of Bern; Bern Switzerland
| | - Silke Bauer
- Swiss Ornithological Inst.; Sempach Switzerland
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30
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Saino N, Ambrosini R, Caprioli M, Romano A, Romano M, Rubolini D, Scandolara C, Liechti F. Sex-dependent carry-over effects on timing of reproduction and fecundity of a migratory bird. J Anim Ecol 2017; 86:239-249. [DOI: 10.1111/1365-2656.12625] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 12/04/2016] [Indexed: 11/29/2022]
Affiliation(s)
- Nicola Saino
- Department of Biosciences; University of Milan; Via Celoria 26 I-20133 Milan Italy
| | - Roberto Ambrosini
- Department of Earth and Environmental Sciences; University of Milano-Bicocca; Piazza della Scienza 2 I-20126 Milan Italy
| | - Manuela Caprioli
- Department of Biosciences; University of Milan; Via Celoria 26 I-20133 Milan Italy
| | - Andrea Romano
- Department of Biosciences; University of Milan; Via Celoria 26 I-20133 Milan Italy
| | - Maria Romano
- Department of Biosciences; University of Milan; Via Celoria 26 I-20133 Milan Italy
| | - Diego Rubolini
- Department of Biosciences; University of Milan; Via Celoria 26 I-20133 Milan Italy
| | - Chiara Scandolara
- Department of Biosciences; University of Milan; Via Celoria 26 I-20133 Milan Italy
- Swiss Ornithological Insititute; Seerose 1 CH-6204 Sempach Switzerland
| | - Felix Liechti
- Swiss Ornithological Insititute; Seerose 1 CH-6204 Sempach Switzerland
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31
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King DT, Wang G, Yang Z, Fischer JW. Advances and Environmental Conditions of Spring Migration Phenology of American White Pelicans. Sci Rep 2017; 7:40339. [PMID: 28091554 PMCID: PMC5238423 DOI: 10.1038/srep40339] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 12/05/2016] [Indexed: 11/09/2022] Open
Abstract
Spring migration phenology of birds has advanced under warming climate. Migration timing of short-distance migrants is believed to be responsive to environmental changes primarily under exogenous control. However, understanding the ecological causes of the advancement in avian spring migration phenology is still a challenge due to the lack of long-term precise location data. We used 11 years of Global Positioning System relocation data to determine four different migration dates of the annual migration cycle of the American white pelican (Pelecanus erythrorhynchos), a short-distance migrant. We also tested the hypothesis that increases in winter temperature and precipitation on the wintering grounds would advance pelican spring migration. Pelican spring departures and arrivals advanced steadily from 2002 to 2011. Spring departure timing exhibited high repeatability at the upper end of migration timing repeatability reported in literature. However, individual spring departure and arrival dates were not related to winter daily temperature, total winter precipitation, and detrended vegetation green-up dates indexed by the normalized difference vegetation index. Despite high repeatability, the observed between-year variation of spring departure dates was still sufficient for the advancement of spring departure timing.
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Affiliation(s)
- D Tommy King
- U. S. Department of Agriculture, Wildlife Services, National Wildlife Research Center, P.O. Box 6099, Mississippi State, Mississippi 39762, USA
| | - Guiming Wang
- Department of Wildlife, Fisheries and Aquaculture, Mail Stop 9690, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - Zhiqiang Yang
- Department of Forest Ecosystem and Society, Oregon State University, Corvallis, Oregon 97331, USA
| | - Justin W Fischer
- U. S. Department of Agriculture, Wildlife Services, National Wildlife Research Center, Fort Collins, Colorado 80521, USA
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32
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Thorup K, Tøttrup AP, Willemoes M, Klaassen RHG, Strandberg R, Vega ML, Dasari HP, Araújo MB, Wikelski M, Rahbek C. Resource tracking within and across continents in long-distance bird migrants. SCIENCE ADVANCES 2017; 3:e1601360. [PMID: 28070557 PMCID: PMC5214581 DOI: 10.1126/sciadv.1601360] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 11/21/2016] [Indexed: 05/14/2023]
Abstract
Migratory birds track seasonal resources across and between continents. We propose a general strategy of tracking the broad seasonal abundance of resources throughout the annual cycle in the longest-distance migrating land birds as an alternative to tracking a certain climatic niche or shorter-term resource surplus occurring, for example, during spring foliation. Whether and how this is possible for complex annual spatiotemporal schedules is not known. New tracking technology enables unprecedented spatial and temporal mapping of long-distance movement of birds. We show that three Palearctic-African species track vegetation greenness throughout their annual cycle, adjusting the timing and direction of migratory movements with seasonal changes in resource availability over Europe and Africa. Common cuckoos maximize the vegetation greenness, whereas red-backed shrikes and thrush nightingales track seasonal surplus in greenness. Our results demonstrate that the longest-distance migrants move between consecutive staging areas even within the wintering region in Africa to match seasonal variation in regional climate. End-of-century climate projections indicate that optimizing greenness would be possible but that vegetation surplus might be more difficult to track in the future.
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Affiliation(s)
- Kasper Thorup
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark
| | - Anders P Tøttrup
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark
| | - Mikkel Willemoes
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark
| | - Raymond H G Klaassen
- Department of Biology, Lund University, Ecology Building, SE-22362 Lund, Sweden.; Dutch Montagu's Harrier Foundation, P.O. Box 46, 9679ZG Scheemda, Netherlands.; Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, P.O. Box 11103, 9700CC Groningen, Netherlands
| | - Roine Strandberg
- Department of Biology, Lund University, Ecology Building, SE-22362 Lund, Sweden
| | - Marta Lomas Vega
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark
| | - Hari P Dasari
- Centro de Geofisica de Évora, Universidade de Évora, 7000 Évora, Portugal.; Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Miguel B Araújo
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark.; Museo Nacional de Ciencias Naturales, CSIC, Calle José Gutiérrez Abascal, 2, 28006, Madrid, Spain.; CIBIO-InBIO, Universidade de Évora, Largo dos Colegiais, 7000 Évora, Portugal
| | - Martin Wikelski
- Department of Migration and Immuno-Ecology, Max Planck Institute for Ornithology, Radolfzell, Germany.; Department of Biology, University of Konstanz, Konstanz, Germany
| | - Carsten Rahbek
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark.; Imperial College London, Silwood Park Campus, Ascot, Berkshire SL5 7PY, U.K
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33
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van Wijk RE, Bauer S, Schaub M. Repeatability of individual migration routes, wintering sites, and timing in a long-distance migrant bird. Ecol Evol 2016; 6:8679-8685. [PMID: 28035259 PMCID: PMC5192954 DOI: 10.1002/ece3.2578] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 10/02/2016] [Accepted: 10/05/2016] [Indexed: 12/02/2022] Open
Abstract
Migratory birds are often faithful to wintering (nonbreeding) sites, and also migration timing is usually remarkably consistent, that is, highly repeatable. Spatiotemporal repeatability can be of advantage for multiple reasons, including familiarity with local resources and predators as well as avoiding the costs of finding a new place, for example, nesting grounds. However, when the environment is variable in space and time, variable site selection and timing might be more rewarding. To date, studies on spatial and temporal repeatability in short-lived long-distance migrants are scarce, most notably of first-time and subsequent migrations. Here, we investigated repeatability in autumn migration directions, wintering sites, and annual migration timing in Hoopoes (Upupa epops), a long-distance migrant, using repeated tracks of adult and first-time migrants. Even though autumn migration directions were mostly the same, individual wintering sites often changed from year to year with distances between wintering sites exceeding 1,000 km. The timing of migration was repeatable within an individual during autumn, but not during spring migration. We suggest that Hoopoes respond to variable environmental conditions such as north-south shifts in rainfall during winter and differing onset of the food availability during spring migration.
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Affiliation(s)
- Rien E. van Wijk
- Swiss Ornithological InstituteSempachSwitzerland
- Department of Evolutionary Biology and Environmental StudiesUniversity of ZürichZürichSwitzerland
- Present address: Rien E. van Wijk Calle Zafra 12 2‐418010GranadaSpain
| | - Silke Bauer
- Swiss Ornithological InstituteSempachSwitzerland
| | - Michael Schaub
- Swiss Ornithological InstituteSempachSwitzerland
- Institute of Ecology and EvolutionDivision of Conservation BiologyUniversity of BernBernSwitzerland
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34
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Smith SH, Steenhof K, McClure CJW, Heath JA. Earlier nesting by generalist predatory bird is associated with human responses to climate change. J Anim Ecol 2016; 86:98-107. [PMID: 27871118 DOI: 10.1111/1365-2656.12604] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 10/12/2016] [Indexed: 11/30/2022]
Abstract
Warming temperatures cause temporal changes in growing seasons and prey abundance that drive earlier breeding by birds, especially dietary specialists within homogeneous habitat. Less is known about how generalists respond to climate-associated shifts in growing seasons or prey phenology, which may occur at different rates across land cover types. We studied whether breeding phenology of a generalist predator, the American kestrel (Falco sparverius), was associated with shifts in growing seasons and, presumably, prey abundance, in a mosaic of non-irrigated shrub/grasslands and irrigated crops/pastures. We examined the relationship between remotely-sensed normalized difference vegetation index (NDVI) and abundance of small mammals that, with insects, constitute approximately 93% of kestrel diet biomass. We used NDVI to estimate the start of the growing season (SoGS) in irrigated and non-irrigated lands from 1992 to 2015 and tested whether either estimate of annual SoGS predicted the timing of kestrel nesting. Finally, we examined relationships among irrigated SoGS, weather and crop planting. NDVI was a useful proxy for kestrel prey because it predicted small mammal abundance and past studies showed that NDVI predicts insect abundance. NDVI-estimated SoGS advanced significantly in irrigated lands (β = -1·09 ± 0·30 SE) but not in non-irrigated lands (β = -0·57 ± 0·53). Average date of kestrel nesting advanced 15 days in the past 24 years and was positively associated with the SoGS in irrigated lands, but not the SoGS in non-irrigated lands. Advanced SoGS in irrigated lands was related to earlier planting of crops after relatively warm winters, which were more common in recent years. Despite different patterns of SoGS change between land cover types, kestrel nesting phenology shifted with earlier prey availability in irrigated lands. Kestrels may preferentially track prey in irrigated lands over non-irrigated lands because of higher quality prey on irrigated lands, or earlier prey abundance may release former constraints on other selective pressures to breed early, such as seasonal declines in fecundity or competition for high-quality mates. This is one of the first examples of an association between human adaptation to climate change and shifts in breeding phenology of wildlife.
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Affiliation(s)
- Shawn H Smith
- Department of Biological Sciences and Raptor Research Center, Boise State University, 1910 University Drive, Boise, ID 83725, USA
| | - Karen Steenhof
- Owyhee Desert Studies, 18109 Briar Creek Road, Murphy, ID 83650, USA
| | | | - Julie A Heath
- Department of Biological Sciences and Raptor Research Center, Boise State University, 1910 University Drive, Boise, ID 83725, USA
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35
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Murgatroyd M, Underhill LG, Bouten W, Amar A. Ranging Behaviour of Verreaux's Eagles during the Pre-Breeding Period Determined through the Use of High Temporal Resolution Tracking. PLoS One 2016; 11:e0163378. [PMID: 27723832 PMCID: PMC5056708 DOI: 10.1371/journal.pone.0163378] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 09/06/2016] [Indexed: 11/18/2022] Open
Abstract
Information on movement ecology is key in understanding the drivers and limitations of life history traits and has a potential role in indicating environmental change. Currently we have a limited understanding of the parameters of movement of territory-bound raptors, which are sensitive to environmental change. In this study we used GPS tracking technology to obtain spatially (within 3 m) and temporally (c. 3 mins) high-resolution movement data on a small sample of Verreaux’s eagle Aquila verreauxii during the pre-laying period (n = 4) with one additional example during the chick rearing period. We present GPS-derived home range estimates for this species and we examine temporal (timing, duration, frequency and speed) and spatial (total path length and maximum distance from nest) patterns of trips away from the nest. For eagles tagged in the agriculturally developed Sandveld region (n = 3), which is made up of a mosaic of land use types, we also undertook a habitat selection analysis. Home ranges were small and largely mutually exclusive. Trip activity was centred around midday, which is likely to be related to lift availability. Our habitat selection analysis found that eagles selected for near-natural and degraded habitat over natural or completely modified areas, suggesting that these eagles may have benefitted from some of the agricultural development in this region. Although our sample sizes are small, the resolution of our tracking data was essential in deriving this data over a relatively short time period and paves the way for future research.
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Affiliation(s)
- Megan Murgatroyd
- Animal Demography Unit, Department of Biological Sciences, University of Cape Town, Rondebosch, 7701, South Africa
- Percy FitzPatrick Institute of African Ornithology, Department of Biological Sciences, University of Cape Town, Rondebosch, 7701, South Africa
- * E-mail:
| | - Les G. Underhill
- Animal Demography Unit, Department of Biological Sciences, University of Cape Town, Rondebosch, 7701, South Africa
| | - Willem Bouten
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands
| | - Arjun Amar
- Percy FitzPatrick Institute of African Ornithology, Department of Biological Sciences, University of Cape Town, Rondebosch, 7701, South Africa
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Schlaich AE, Klaassen RHG, Bouten W, Bretagnolle V, Koks BJ, Villers A, Both C. How individual Montagu's Harriers cope with Moreau's Paradox during the Sahelian winter. J Anim Ecol 2016; 85:1491-1501. [DOI: 10.1111/1365-2656.12583] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Accepted: 08/01/2016] [Indexed: 11/28/2022]
Affiliation(s)
- Almut Ellinor Schlaich
- Dutch Montagu's Harrier Foundation; PO Box 46 9679ZG Scheemda The Netherlands
- Conservation Ecology Group; Groningen Institute for Evolutionary Life Sciences; University of Groningen; PO Box 11103 9700CC Groningen The Netherlands
- Centre d'Etudes Biologiques de Chizé; UMR 7372; CNRS & Université de la Rochelle; 79360 Villiers-en-Bois France
| | - Raymond H. G. Klaassen
- Dutch Montagu's Harrier Foundation; PO Box 46 9679ZG Scheemda The Netherlands
- Conservation Ecology Group; Groningen Institute for Evolutionary Life Sciences; University of Groningen; PO Box 11103 9700CC Groningen The Netherlands
| | - Willem Bouten
- Computational Geo-Ecology; Institute for Biodiversity and Ecosystem Dynamics; University of Amsterdam; PO Box 94248 1090GE Amsterdam The Netherlands
| | - Vincent Bretagnolle
- Centre d'Etudes Biologiques de Chizé; UMR 7372; CNRS & Université de la Rochelle; 79360 Villiers-en-Bois France
- LTER ‘Zone Atelier Plaine & Val de Sèvre’; Centre d'Etudes Biologiques de Chizé; CNRS; 79360 Villiers-en-Bois France
| | - Ben Johannes Koks
- Dutch Montagu's Harrier Foundation; PO Box 46 9679ZG Scheemda The Netherlands
| | - Alexandre Villers
- Centre d'Etudes Biologiques de Chizé; UMR 7372; CNRS & Université de la Rochelle; 79360 Villiers-en-Bois France
| | - Christiaan Both
- Conservation Ecology Group; Groningen Institute for Evolutionary Life Sciences; University of Groningen; PO Box 11103 9700CC Groningen The Netherlands
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37
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Bauder JM, Breininger DR, Bolt MR, Legare ML, Jenkins CL, Rothermel BB, McGarigal K. Seasonal Variation in Eastern Indigo Snake (Drymarchon couperi) Movement Patterns and Space Use in Peninsular Florida at Multiple Temporal Scales. HERPETOLOGICA 2016. [DOI: 10.1655/herpetologica-d-15-00039.1] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Javan M. Bauder
- Department of Environmental Conservation, University of Massachusetts, Amherst, MA 01003, USA
| | - David R. Breininger
- NASA Ecological Programs, Integrated Mission Support Services, Mail Code IMSS-300, Kennedy Space Center, FL 32899, USA
| | - M. Rebecca Bolt
- NASA Ecological Programs, Integrated Mission Support Services, Mail Code IMSS-200, Kennedy Space Center, FL 32899, USA
| | - Michael L. Legare
- Merritt Island National Wildlife Refuge, PO Box 6504, Titusville, FL 32782, USA
| | | | | | - Kevin McGarigal
- Department of Environmental Conservation, University of Massachusetts, Amherst, MA 01003, USA
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Henry DAW, Ament JM, Cumming GS. Exploring the environmental drivers of waterfowl movement in arid landscapes using first-passage time analysis. MOVEMENT ECOLOGY 2016; 4:8. [PMID: 27042310 PMCID: PMC4818463 DOI: 10.1186/s40462-016-0073-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Accepted: 02/16/2016] [Indexed: 05/23/2023]
Abstract
BACKGROUND The movement patterns of many southern African waterfowl are typified by nomadism, which is thought to be a response to unpredictable changes in resource distributions. Nomadism and the related movement choices that waterfowl make in arid environments are, however, poorly understood. Tracking multiple individuals across wide spatiotemporal gradients offers one approach to elucidating the cues and mechanisms underpinning movement decisions. We used first-passage time (FPT) to analyse high spatial and temporal resolution telemetry data for Red-billed Teal and Egyptian Geese across a 1500 km geographical gradient between 2008 and 2014. We tested the importance of several environmental variables in structuring movement patterns, focusing on two competing hypotheses: (1) whether movements are driven by resource conditions during the current period of habitat occupation (reactive movement hypothesis), or (2) whether movements are structured by shifts in the magnitude and direction of environmental variables at locations prior to occupation (prescient movement hypothesis). RESULTS An increase in rainfall at a 32 day lag (i.e., prior to wetland occupancy), along with tagging site, were significant predictors of FPT in both waterfowl species. There was a positive relationship between NDVI and FPT for Egyptian Geese during this 32 day period; the relationship was negative for Red-billed Teal. Consistent with findings for migratory grazing geese, Egyptian Geese prioritised food quality over food biomass. Red-billed Teal showed few immediate responses to wetland filling, contrary to what one would predict for a dabbling duck, suggesting high dietary flexibility. Our results were consistent with the prescient movement hypothesis. CONCLUSIONS Using FPT analysis we showed that the proximate drivers of southern African waterfowl movement are the dynamics of rainfall and primary productivity. Waterfowl appeared to be able to perceive and respond to temporal shifts in resource conditions prior to habitat patch occupation. This in turn suggests that their movements in semi-arid landscapes may be underpinned by intimate knowledge of the local environment; waterfowl pursue a complex behavioural strategy, locating suitable habitat patches proactively, rather than acting as passive respondents.
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Affiliation(s)
- Dominic A. W. Henry
- />Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, Rondebosch, Cape Town 7701 South Africa
| | - Judith M. Ament
- />Centre for Biodiversity and Environment Research, Department of Genetics, Evolution and Environment, University College London, London, WC1E 6BT UK
- />Institute of Zoology, Zoological Society of London, Regent’s Park, London, NW1 4RY UK
| | - Graeme S. Cumming
- />Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, Rondebosch, Cape Town 7701 South Africa
- />ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811 Australia
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Taylor CM, Laughlin AJ, Hall RJ. The response of migratory populations to phenological change: a Migratory Flow Network modelling approach. J Anim Ecol 2016; 85:648-59. [PMID: 26782029 DOI: 10.1111/1365-2656.12494] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 12/22/2015] [Indexed: 11/29/2022]
Abstract
Declines in migratory species have been linked to anthropogenic climate change through phenological mismatch, which arises due to asynchronies between the timing of life-history events (such as migration) and the phenology of available resources. Long-distance migratory species may be particularly vulnerable to phenological change in their breeding ranges, since the timing of migration departure is based on environmental cues at distant non-breeding sites. Migrants may, however, be able to adjust migration speed en route to the breeding grounds, and thus, ability of migrants to update their timing of migration may depend critically on stopover frequency during migration; however, understanding how migratory strategy influences population dynamics is hindered by a lack of predictive models explicitly linking habitat quality to demography and movement patterns throughout the migratory cycle. Here, we present a novel modelling framework, the Migratory Flow Network (MFN), in which the seasonally varying attractiveness of breeding, winter and stopover regions drives the direction and timing of migration based on a simple general flux law. We use the MFN to investigate how populations respond to shifts in breeding site phenology based on their frequency of stopover and ability to detect and adapt to these changes. With perfect knowledge of advancing phenology, 'jump' migrants (low-frequency stopover) require more adaptation for populations to recover than 'hop' and 'skip' (high or medium frequency stopover) migrants. If adaptation depends on proximity, hop and skip migrants' populations can recover but jump migrants cannot adjust and decline severely. These results highlight the importance of understanding migratory strategies and maintaining high-quality stopover habitat to buffer migratory populations from climate-induced mismatch. We discuss how MFNs could be applied to diverse migratory taxa and highlight the potential of MFNs as a tool for exploring how migrants respond to other environmental changes such as habitat loss.
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Affiliation(s)
- Caz M Taylor
- Department of Ecology and Evolutionary Biology, 400 Lindy Boggs Hall, Tulane University, 6823 St. Charles Ave., New Orleans, LA, 70118, USA
| | - Andrew J Laughlin
- Department of Environmental Studies, CPO #2330, UNC Asheville, One University Heights, Asheville, NC 28804, USA
| | - Richard J Hall
- Odum School of Ecology and Department of Infectious Diseases, 140 E Green St, University of Georgia, Athens, GA, 30602, USA
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Movement Patterns of Prairie Rattlesnakes (Crotalus v. viridis) across a Mountainous Landscape in a Designated Wilderness Area. J HERPETOL 2015. [DOI: 10.1670/13-153] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kays R, Crofoot MC, Jetz W, Wikelski M. ECOLOGY. Terrestrial animal tracking as an eye on life and planet. Science 2015; 348:aaa2478. [PMID: 26068858 DOI: 10.1126/science.aaa2478] [Citation(s) in RCA: 664] [Impact Index Per Article: 73.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Moving animals connect our world, spreading pollen, seeds, nutrients, and parasites as they go about the their daily lives. Recent integration of high-resolution Global Positioning System and other sensors into miniaturized tracking tags has dramatically improved our ability to describe animal movement. This has created opportunities and challenges that parallel big data transformations in other fields and has rapidly advanced animal ecology and physiology. New analytical approaches, combined with remotely sensed or modeled environmental information, have opened up a host of new questions on the causes of movement and its consequences for individuals, populations, and ecosystems. Simultaneous tracking of multiple animals is leading to new insights on species interactions and, scaled up, may enable distributed monitoring of both animals and our changing environment.
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Affiliation(s)
- Roland Kays
- North Carolina Museum of Natural Sciences, Raleigh, NC, USA. Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC, USA. Smithsonian Tropical Research Institute, Balboa, Republic of Panama.
| | - Margaret C Crofoot
- Smithsonian Tropical Research Institute, Balboa, Republic of Panama. Department of Anthropology, University of California, Davis, Davis, CA, USA. Department of Migration and Immuno-Ecology, Max Planck Institute for Ornithology, Radolfzell, Germany
| | - Walter Jetz
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT 06520, USA. Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot SL5 7PY, UK
| | - Martin Wikelski
- Smithsonian Tropical Research Institute, Balboa, Republic of Panama. Department of Migration and Immuno-Ecology, Max Planck Institute for Ornithology, Radolfzell, Germany. Department of Biology, University of Konstanz, Konstanz, Germany
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Rodríguez-Ruiz J, de la Puente J, Parejo D, Valera F, Calero-Torralbo MA, Reyes-González JM, Zajková Z, Bermejo A, Avilés JM. Disentangling migratory routes and wintering grounds of Iberian near-threatened European Rollers Coracias garrulus. PLoS One 2014; 9:e115615. [PMID: 25551212 PMCID: PMC4281181 DOI: 10.1371/journal.pone.0115615] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 11/19/2014] [Indexed: 11/18/2022] Open
Abstract
Long-distance migrants are suffering drastic declines in the last decades. Causes beneath this problem are complex due to the wide spatial and temporal scale involved. We aim to reveal migratory routes, stopover areas, wintering grounds, and migratory strategies for the most southwestern populations of the near-threatened European Roller Coracias garrulus in order to identify conservation key areas for the non-breeding stage of this species. To this end, we used tracking data from seven satellite transmitters fitted to birds breeding in different populations throughout the Iberian Peninsula and four geolocators fitted to individuals in a southeastern Iberian population. Precise satellite data were used to describe daily activity patterns and speed in relation to the main regions crossed during the migration. Individuals from the most southwestern Iberian populations made a detour towards the Atlantic African coast whereas those from northeastern populations followed a straight north-to-south route. We identified important stopover areas in the Sahel belt, mainly in the surroundings of the Lake Chad, and wintering grounds on southwestern Africa farther west than previously reported for the species. Concerning the migratory strategy, satellite data revealed: 1) a mainly nocturnal flying activity, 2) that migration speed depended on the type of crossed habitat, with higher average speed while crossing the desert; and 3) that the migration was slower and lasted longer in autumn than in spring. The studied populations showed weak migratory connectivity, suggesting the confluence of birds from a wide range of breeding grounds in a restricted wintering area. Therefore, we suggest to target on defining precisely key areas for this species and identifying specific threats in them in order to develop an appropriate global conservation programme for the European Roller.
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Affiliation(s)
- Juan Rodríguez-Ruiz
- Departamento de Ecología Funcional y Evolutiva, Estación Experimental de Zonas Áridas (CSIC), Almería, Spain
- * E-mail:
| | | | - Deseada Parejo
- Departamento de Ecología Funcional y Evolutiva, Estación Experimental de Zonas Áridas (CSIC), Almería, Spain
- Área de Zoología, Departamento de Anatomía, Biología Celular y Zoología, Facultad de Ciencias, Universidad de Extremadura, Badajoz, Spain
| | - Francisco Valera
- Departamento de Ecología Funcional y Evolutiva, Estación Experimental de Zonas Áridas (CSIC), Almería, Spain
| | - Miguel A. Calero-Torralbo
- Departamento de Ecología Funcional y Evolutiva, Estación Experimental de Zonas Áridas (CSIC), Almería, Spain
| | - José M. Reyes-González
- Department of Animal Biology/Vertebrates, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Zuzana Zajková
- Department of Animal Biology/Vertebrates, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Ana Bermejo
- Área de Estudio y Seguimiento de Aves, SEO/BirdLife, Madrid, Spain
| | - Jesús M. Avilés
- Departamento de Ecología Funcional y Evolutiva, Estación Experimental de Zonas Áridas (CSIC), Almería, Spain
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Seasonal differences in migration patterns of a soaring bird in relation to environmental conditions: a multi-scale approach. Behav Ecol Sociobiol 2014. [DOI: 10.1007/s00265-014-1818-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Individual improvements and selective mortality shape lifelong migratory performance. Nature 2014; 515:410-3. [PMID: 25252973 DOI: 10.1038/nature13696] [Citation(s) in RCA: 159] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Accepted: 07/21/2014] [Indexed: 11/08/2022]
Abstract
Billions of organisms, from bacteria to humans, migrate each year and research on their migration biology is expanding rapidly through ever more sophisticated remote sensing technologies. However, little is known about how migratory performance develops through life for any organism. To date, age variation has been almost systematically simplified into a dichotomous comparison between recently born juveniles at their first migration versus adults of unknown age. These comparisons have regularly highlighted better migratory performance by adults compared with juveniles, but it is unknown whether such variation is gradual or abrupt and whether it is driven by improvements within the individual, by selective mortality of poor performers, or both. Here we exploit the opportunity offered by long-term monitoring of individuals through Global Positioning System (GPS) satellite tracking to combine within-individual and cross-sectional data on 364 migration episodes from 92 individuals of a raptorial bird, aged 1-27 years old. We show that the development of migratory behaviour follows a consistent trajectory, more gradual and prolonged than previously appreciated, and that this is promoted by both individual improvements and selective mortality, mainly operating in early life and during the pre-breeding migration. Individuals of different age used different travelling tactics and varied in their ability to exploit tailwinds or to cope with wind drift. All individuals seemed aligned along a race with their contemporary peers, whose outcome was largely determined by the ability to depart early, affecting their subsequent recruitment, reproduction and survival. Understanding how climate change and human action can affect the migration of younger animals may be the key to managing and forecasting the declines of many threatened migrants.
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Emmenegger T, Hahn S, Bauer S. Individual migration timing of common nightingales is tuned with vegetation and prey phenology at breeding sites. BMC Ecol 2014; 14:9. [PMID: 24650177 PMCID: PMC3999983 DOI: 10.1186/1472-6785-14-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Accepted: 03/12/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The timing of migration substantially influences individual fitness. To match peak requirements with peak resource availability, we hypothesized that individual migrants schedule spring migration in close relation to seasonal changes in environmental conditions along the route and particularly, at the breeding destination.To test this hypothesis, we investigated the timing of spring migration in male common nightingales Luscinia megarhynchos, a small Palearctic-African long-distance migrant, by linking spring migration timing to the phenology of local environmental conditions at non-breeding migratory stopover and breeding sites. In particular, we related individual migration decisions (i.e. departure and arrival) of nine males to site-specific vegetation phenology (based on remotely sensed vegetation index) and a proxy of food availability (based on insects' thermal requirements). RESULTS We found weak relation of departures from non-breeding and no relation of stopover timing with local phenology. However, our results showed that individuals, which departed early from their non-breeding sites and arrived early at the breeding site closely matched spring green-up there. Early arrival at the breeding site meant also a close match with peak food availability for adults and in a time-lagged manner, for offspring. CONCLUSION Our findings suggest that male nightingale used cues other than local phenology for their departure decisions from non-breeding grounds and that there is some evidence for equalizing late departures during the course of migration.
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Affiliation(s)
- Tamara Emmenegger
- Department of Bird Migration, Swiss Ornithological Institute, Seerose 1, Sempach 6204, Switzerland.
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Trierweiler C, Klaassen RHG, Drent RH, Exo KM, Komdeur J, Bairlein F, Koks BJ. Migratory connectivity and population-specific migration routes in a long-distance migratory bird. Proc Biol Sci 2014; 281:20132897. [PMID: 24430850 DOI: 10.1098/rspb.2013.2897] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Knowledge about migratory connectivity, the degree to which individuals from the same breeding site migrate to the same wintering site, is essential to understand processes affecting populations of migrants throughout the annual cycle. Here, we study the migration system of a long-distance migratory bird, the Montagu's harrier Circus pygargus, by tracking individuals from different breeding populations throughout northern Europe. We identified three main migration routes towards wintering areas in sub-Saharan Africa. Wintering areas and migration routes of different breeding populations overlapped, a pattern best described by 'weak (diffuse) connectivity'. Migratory performance, i.e. timing, duration, distance and speed of migration, was surprisingly similar for the three routes despite differences in habitat characteristics. This study provides, to our knowledge, a first comprehensive overview of the migration system of a Palaearctic-African long-distance migrant. We emphasize the importance of spatial scale (e.g. distances between breeding populations) in defining patterns of connectivity and suggest that knowledge about fundamental aspects determining distribution patterns, such as the among-individual variation in mean migration directions, is required to ultimately understand migratory connectivity. Furthermore, we stress that for conservation purposes it is pivotal to consider wintering areas as well as migration routes and in particular stopover sites.
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Affiliation(s)
- Christiane Trierweiler
- Dutch Montagu's Harrier Foundation, , PO Box 46, Scheemda 9679 ZG, The Netherlands, Animal Ecology Group, Centre for Ecological and Evolutionary Studies, University of Groningen, , PO Box 11103, Groningen 9700 CC, The Netherlands, Behavioural Ecology and Self-organization, Centre for Ecological and Evolutionary Studies, University of Groningen, , PO Box 11103, Groningen 9700 CC, The Netherlands, Institute of Avian Research 'Vogelwarte Helgoland', , An der Vogelwarte 21, Wilhelmshaven 26386, Germany
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