1
|
Kim IH, Park IK, Park D, Kim MS, Cho IY, Yang D, Han DJ, Cho E, Shim WJ, Hong SH, An YR. Habitat use of loggerhead (Caretta caretta) and green (Chelonia mydas) turtles at the northern limit of their distribution range of the Northwest Pacific Ocean. PLoS One 2024; 19:e0290202. [PMID: 38573996 PMCID: PMC10994308 DOI: 10.1371/journal.pone.0290202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 01/30/2024] [Indexed: 04/06/2024] Open
Abstract
Verifying habitats, including the foraging and nesting areas for sea turtles, enables an understanding of their spatial ecology and successful planning of their conservation and management strategies. Recently, the observation frequency and bycatch of loggerhead (Caretta caretta) and green (Chelonia mydas) turtles have increased in the northern limit of their distribution range, in the northern part of the East China Sea and East (Japan) Sea. We conducted satellite tracking to investigate the habitat use of seven loggerhead and eight green turtles from June 2016 to August 2022 in this area, where little is known about their spatial ecology. We applied a 50 percent volume contour method to determine their main foraging areas and analyzed 6 environmental variables to characterize their habitats. Loggerhead turtles mainly stayed in and used the East China Sea as a foraging area during the tracking period, while two individuals among them also used the East Sea as a seasonal foraging area. Most green turtles also used the East China Sea as a foraging area, near South Korea and Japan, with one individual among them using the lower area of the East Sea as a seasonal foraging area. Notably, one green turtle traveled to Hainan Island in the South China Sea, a historical nesting area. Our results showed that the two sea turtle species included the East Sea as a seasonal foraging area, possibly owing to the abundance of food sources available, despite its relatively lower sea temperature. Considering that loggerhead and green sea turtles were observed using the northern part of the East China Sea and East Sea more frequently than previously known and that the sea temperature gradually increases due to climate change, conservation and management activities are required for sea turtles in these areas.
Collapse
Affiliation(s)
- Il-Hun Kim
- Department of Ecology and Conservation, National Marine Biodiversity Institute of Korea, Seocheon, Chungcheongnam-do, Republic of Korea
| | - Il-Kook Park
- Division of Science Education, Kangwon National University, Chuncheon, Gangwon-do, Republic of Korea
| | - Daesik Park
- Division of Science Education, Kangwon National University, Chuncheon, Gangwon-do, Republic of Korea
| | - Min-Seop Kim
- Department of Ecology and Conservation, National Marine Biodiversity Institute of Korea, Seocheon, Chungcheongnam-do, Republic of Korea
| | - In-Young Cho
- Department of Ecology and Conservation, National Marine Biodiversity Institute of Korea, Seocheon, Chungcheongnam-do, Republic of Korea
| | - Dongwoo Yang
- Department of Ecology and Conservation, National Marine Biodiversity Institute of Korea, Seocheon, Chungcheongnam-do, Republic of Korea
| | - Dong-Jin Han
- Aqua Team, Aqua Planet Yeosu, Yeosu, Jeollanam-do, Republic of Korea
| | - Eunvit Cho
- Aqua Team, Aqua Planet Yeosu, Yeosu, Jeollanam-do, Republic of Korea
| | - Won Joon Shim
- Ecological Risk Research Department, Korea Institute of Ocean Science and Technology, Geoje, Gyeongsangnam-do, Republic of Korea
| | - Sang Hee Hong
- Ecological Risk Research Department, Korea Institute of Ocean Science and Technology, Geoje, Gyeongsangnam-do, Republic of Korea
- Department of Ocean Science, University of Science and Technology, Daejeon, Republic of Korea
| | - Yong-Rock An
- Department of Ecology and Conservation, National Marine Biodiversity Institute of Korea, Seocheon, Chungcheongnam-do, Republic of Korea
| |
Collapse
|
2
|
Attum O, Nagy A. Patterns of light pollution on sea turtle nesting beaches in the Egyptian Red Sea. Mar Pollut Bull 2024; 201:116246. [PMID: 38531203 DOI: 10.1016/j.marpolbul.2024.116246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 03/06/2024] [Accepted: 03/06/2024] [Indexed: 03/28/2024]
Abstract
We examined the probability of past sea turtle nesting as a function of light intensity and patterns of temporal changes of light along nesting beaches in the Egyptian Red Sea. Beaches had a lower probability of past sea turtle nesting as light intensity increased. Light has been significantly increasing on mainland nesting beaches between 1992 and 2021 except for temporary declines. Island beaches historically had lower light pollution, but there was a sudden increase of light starting in 2014 that continued through 2021, except for the precipitous decline in 2020 during the Covid 19 pandemic. Light pollution on past nesting beaches has now approached levels that may be too polluted and discourage nesting. The impacts of the increased light pollution on nesting density and hatchling survival of hawksbill, Eretmochelys imbricata, and green turtles, Chelonia mydas, is likely negative.
Collapse
Affiliation(s)
- Omar Attum
- Department of Biology, Indiana University Southeast, 4201 Grant Line Rd., New Albany, IN 47150, USA.
| | - Abdullah Nagy
- Department of Zoology, Al-Azhar University, 1 Al Mokhayam Al Dayem St., Cairo, Egypt.
| |
Collapse
|
3
|
Gilman E, Chaloupka M, Pacini A, Kingma E. Exploring odontocete depredation rates in a pelagic longline fishery. PLoS One 2024; 19:e0301072. [PMID: 38547232 PMCID: PMC10977886 DOI: 10.1371/journal.pone.0301072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 03/09/2024] [Indexed: 04/01/2024] Open
Abstract
Several odontocete species depredate catch and bait from fishing gear, resulting in their bycatch and causing substantial economic costs. There are no known mitigation methods for odontocete depredation in pelagic longline fisheries that are effective, do not harm odontocetes and are commercially viable. Understanding odontocetes' depredation strategies can contribute to mitigating this human-wildlife conflict. Using observer data from the Hawaii-based tuna longline fishery, this study summarized teleost and elasmobranch species-specific mean posterior odontocete depredation rates using a simple Bayesian binomial likelihood estimator with a Bayes-Laplace prior. Depredation rates of species with sufficient sample sizes ranged from a high of 1.2% (1.1 to 1.3 95% highest posterior density interval or HDI) for shortbill spearfish to a low of 0.002% (0.001 to 0.003 95% HDI) for blue shark. Depredation of catch is a rare event in this fishery, occurring in about 6% of sets. When depredation did occur, most frequently odontocetes depredated a small proportion of the catch, however, there was large variability in depredation rates between teleost species. For example, bigeye tuna was two times more likely to be depredated than yellowfin tuna (odds ratio = 2.03, 95% CI: 1.8-2.3, P<0.0001). For sets with depredation, 10% and 2% of sets had depredation of over half of the captured bigeye tuna and combined teleosts, respectively. All elasmobranch species had relatively low depredation rates, where only 7 of almost 0.5M captured elasmobranchs were depredated. Odontocetes selectively depredate a subset of the teleost species captured within sets, possibly based on net energy value, chemical, visual, acoustic and textural characteristics and body size, but not median length, which was found to be unrelated to depredation rate (Pearson's r = 0.14, 95% CI: -0.26 to 0.50, p = 0.49). Study findings provide evidence to support the identification and innovation of effective and commercially viable methods to mitigate odontocete depredation and bycatch.
Collapse
Affiliation(s)
- Eric Gilman
- Fisheries Research Group, United States of America
| | - Milani Chaloupka
- Ecological Modelling Services and Marine Spatial Ecology Lab, University of Queensland, Brisbane, Australia
| | - Aude Pacini
- University of Hawaii, Honolulu, HI, United States of America
| | - Eric Kingma
- Hawaii Longline Association, Honolulu, HI, United States of America
| |
Collapse
|
4
|
Roast MJ, Martins S, Fernández-Peralta L, Báez JC, Diame A, March D, Ouled-Cheikh J, Marco A, González-Solís J, Cardona L. Hidden demographic impacts of fishing and environmental drivers of fecundity in a sea turtle population. Conserv Biol 2023; 37:e14110. [PMID: 37144486 DOI: 10.1111/cobi.14110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 02/22/2023] [Accepted: 04/23/2023] [Indexed: 05/06/2023]
Abstract
Fisheries bycatch is a critical threat to sea turtle populations worldwide, particularly because turtles are vulnerable to multiple gear types. The Canary Current is an intensely fished region, yet there has been no demographic assessment integrating bycatch and population management information of the globally significant Cabo Verde loggerhead turtle (Caretta caretta) population. Using Boa Vista island (Eastern Cabo Verde) subpopulation data from capture-recapture and nest monitoring (2013-2019), we evaluated population viability and estimated regional bycatch rates (2016-2020) in longline, trawl, purse-seine, and artisanal fisheries. We further evaluated current nesting trends in the context of bycatch estimates, existing hatchery conservation measures, and environmental (net primary productivity) variability in turtle foraging grounds. We projected that current bycatch mortality rates would lead to the near extinction of the Boa Vista subpopulation. Bycatch reduction in longline fisheries and all fisheries combined would increase finite population growth rate by 1.76% and 1.95%, respectively. Hatchery conservation increased hatchling production and reduced extinction risk, but alone it could not achieve population growth. Short-term increases in nest counts (2013-2021), putatively driven by temporary increases in net primary productivity, may be masking ongoing long-term population declines. When fecundity was linked to net primary productivity, our hindcast models simultaneously predicted these opposing long-term and short-term trends. Consequently, our results showed conservation management must diversify from land-based management. The masking effect we found has broad-reaching implications for monitoring sea turtle populations worldwide, demonstrating the importance of directly estimating adult survival and that nest counts might inadequately reflect underlying population trends.
Collapse
Affiliation(s)
- Michael J Roast
- Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals (BEECA), Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
| | - Samir Martins
- BIOS.CV, Environmental Conservation and Sustainable Development, Sal Rei, Cabo Verde
| | | | - José Carlos Báez
- Centro Oceanográfico de Málaga, IEO (CSIC), Fuengirola, Spain
- Instituto Iberoamericano de Desarrollo Sostenible (IIDS), Universidad Autónoma de Chile, Temuco, Chile
| | - Ahmed Diame
- BirdLife Africa, West Africa Sub-Regional Office, Dakar, Senegal
| | - David March
- Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals (BEECA), Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
- Institut de Recerca de la Biodiversitat (IRBio), Barcelona, Spain
- Centre for Ecology and Conservation, College of Life and Environmental Science, University of Exeter, Penryn, UK
| | - Jazel Ouled-Cheikh
- Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals (BEECA), Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
- Institut de Recerca de la Biodiversitat (IRBio), Barcelona, Spain
| | - Adolfo Marco
- Estación Biológica de Doñana, CSIC, Sevilla, Spain
| | - Jacob González-Solís
- Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals (BEECA), Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
- Institut de Recerca de la Biodiversitat (IRBio), Barcelona, Spain
| | - Luis Cardona
- Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals (BEECA), Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
- Institut de Recerca de la Biodiversitat (IRBio), Barcelona, Spain
| |
Collapse
|
5
|
Willette M, Rosenhagen N, Buhl G, Innis C, Boehm J. Interrupted Lives: Welfare Considerations in Wildlife Rehabilitation. Animals (Basel) 2023; 13:1836. [PMID: 37889738 PMCID: PMC10252006 DOI: 10.3390/ani13111836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Revised: 05/20/2023] [Accepted: 05/23/2023] [Indexed: 10/29/2023] Open
Abstract
Each year in the United States, thousands of sick, injured, or displaced wild animals are presented to individuals or organizations who have either a federal or state permit that allows them to care for these animals with the goal of releasing them back to the wild. The purpose of this review is to demonstrate the complexity of considerations rehabilitators and veterinarians face while trying to optimize the welfare of wild animals in need of care and rehabilitation. The process of rehabilitation is inherently stressful for wildlife. Maintaining an animal's welfare during the rehabilitation process-from initial contact and tria+ge to the animal's euthanasia, release, or captive placement-requires deliberate, timely and humane decision making. The welfare of wild animals can be improved by preventing human-related causes of admission, providing resources and support for wildlife rehabilitation (almost all rehabilitation in the United States is privately funded and access to veterinary care is often limited); further developing evidence-based wildlife rehabilitation methods and welfare measures, attracting more veterinary professionals to the field, harmonizing regulatory oversight with standards of care, training, and accountability, and increasing public education.
Collapse
Affiliation(s)
| | | | - Gail Buhl
- The Raptor Center, St. Paul, MN 55108, USA;
| | | | - Jeff Boehm
- The Marine Mammal Center, Sausalito, CA 94965, USA;
| |
Collapse
|
6
|
Vélez-Rubio GM, Prosdocimi L, López-Mendilaharsu M, Caraccio MN, Fallabrino A, LaCasella EL, Dutton PH. Natal Origin and Spatiotemporal Distribution of Leatherback Turtle ( Dermochelys coriacea) Strandings at a Foraging Hotspot in Temperate Waters of the Southwest Atlantic Ocean. Animals (Basel) 2023; 13:ani13081285. [PMID: 37106848 PMCID: PMC10134985 DOI: 10.3390/ani13081285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 04/04/2023] [Accepted: 04/05/2023] [Indexed: 04/29/2023] Open
Abstract
Leatherback turtles migrate long distances between nesting beaches and distant foraging areas worldwide. This study analyzes the genetic diversity, life history stage, spatiotemporal distribution, and associated threats of a foraging aggregation in the Southwest Atlantic Ocean. A total of 242 leatherbacks stranded or bycaught by artisanal fisheries were recorded from 1997 to 2021 in Uruguay, with sizes ranging from 110.0 to 170.0 cm carapace lengths, indicating that the aggregation is composed of large juveniles and adults. Results of Bayesian mixed-stock analysis show that leatherbacks come primarily from the West African rookeries, based on mitochondrial DNA sequences obtained from 59 of the turtles representing seven haplotypes, including a novel one (Dc1.7). The main threat identified in the area is the fisheries bycatch but most of the carcasses observed were badly decomposed. There was significant seasonal and interannual variability in strandings that is likely associated with the availability of prey and the intensity of the fishing effort. Taken together, these findings reinforce the importance of these South American foraging areas for leatherbacks and the need to determine regional habitat use and migratory routes across the broader Atlantic region, in order to develop effective conservation measures to mitigate threats both at nesting beaches and foraging areas.
Collapse
Affiliation(s)
- Gabriela M Vélez-Rubio
- Karumbé NGO, Av. Rivera 3245, Montevideo 11600, Uruguay
- Sección Oceanografía y Ecología Marina, Instituto de Ecología y Ciencias Ambientales, Facultad de Ciencias, Universidad de la República, Montevideo 11400, Uruguay
- Departamento MEDIA, Centro Universitario Regional del Este (CURE), Universidad de la República, Ruta 9 Intersección con Ruta 15, Rocha 27000, Uruguay
| | - Laura Prosdocimi
- Karumbé NGO, Av. Rivera 3245, Montevideo 11600, Uruguay
- Laboratorio de Ecología, Comportamiento y Mamíferos Marinos (LECyMM), Museo Argentino de Ciencias Naturales (MACN-CONICET), Av. Ángel Gallardo 470, CABA, Buenos Aires C1405DJR, Argentina
| | | | | | | | - Erin L LaCasella
- NOAA-National Marine Fisheries Service, Southwest Fisheries Science Center, 8901 La Jolla Shores Dr, La Jolla, CA 92037, USA
| | - Peter H Dutton
- NOAA-National Marine Fisheries Service, Southwest Fisheries Science Center, 8901 La Jolla Shores Dr, La Jolla, CA 92037, USA
| |
Collapse
|
7
|
Putman NF, Richards PM, Dufault SG, Scott-Dention E, McCarthy K, Beyea RT, Caillouet CW, Heyman WD, Seney EE, Mansfield KL, Gallaway BJ. Modeling juvenile sea turtle bycatch risk in commercial and recreational fisheries. iScience 2023; 26:105977. [PMID: 36756371 PMCID: PMC9900512 DOI: 10.1016/j.isci.2023.105977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 11/16/2022] [Accepted: 01/10/2023] [Indexed: 01/15/2023] Open
Abstract
Understanding the drivers of fisheries bycatch is essential for limiting its impacts on vulnerable species. Here we present a model to estimate the relative magnitude of sea turtle bycatch in major coastal fisheries across the southeastern US based on spatiotemporal variation in fishing effort and the simulated distributions of juvenile Kemp's ridley (Lepidochelys kempii) and green (Chelonia mydas) sea turtles recruiting from oceanic to nearshore habitats. Over the period modeled (1996-2017), bycatch in recreational fisheries was estimated to be greater than the sum of bycatch that occurred in commercial fisheries that have historically been considered high risks to turtles (e.g., those using trawls, gillnets, and bottom longlines). Prioritizing engagement with recreational anglers to reduce bycatch could be especially beneficial to sea turtle populations. Applying lessons learned from efforts to protect turtles in commercial fisheries may help meet the challenges that arise from the large, diffuse recreational fishing sector.
Collapse
Affiliation(s)
- Nathan F. Putman
- LGL Ecological Research Associates, Bryan, TX 77802, USA,Corresponding author
| | - Paul M. Richards
- NOAA National Marine Fisheries Service, Southeast Fisheries Science Center, Miami, FL 33149, USA
| | | | - Elizabeth Scott-Dention
- NOAA National Marine Fisheries Service, Southeast Fisheries Science Center, Galveston, TX 77551, USA
| | - Kevin McCarthy
- NOAA National Marine Fisheries Service, Southeast Fisheries Science Center, Miami, FL 33149, USA
| | | | | | | | - Erin E. Seney
- Marine Turtle Research Group, Department of Biology, University of Central Florida, Orlando, FL 32816, USA
| | - Katherine L. Mansfield
- Marine Turtle Research Group, Department of Biology, University of Central Florida, Orlando, FL 32816, USA
| | | |
Collapse
|
8
|
Liang D, Bailey H, Hoover AL, Eckert S, Zarate P, Alfaro‐Shigueto J, Mangel JC, de Paz Campos N, Davila JQ, Barturen DS, Rguez‐Baron JM, Fahy C, Rocafuerte A, Veelenturf C, Abrego M, Shillinger GL. Integrating telemetry and point observations to inform management and conservation of migratory marine species. Ecosphere 2023. [DOI: 10.1002/ecs2.4375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Affiliation(s)
- Dong Liang
- Chesapeake Biological Laboratory University of Maryland Center for Environmental Science Solomons Maryland USA
| | - Helen Bailey
- Chesapeake Biological Laboratory University of Maryland Center for Environmental Science Solomons Maryland USA
| | | | - Scott Eckert
- Department of Biology and Natural Resources Principia College Elsah Illinois USA
- Wider Caribbean Sea Turtle Conservation Network (WIDECAST) Godfrey Illinois USA
| | - Patricia Zarate
- Instituto de Fomento Pesquero Valparaíso Chile
- MigraMar Bodega Bay California USA
| | - Joanna Alfaro‐Shigueto
- ProDelphinus Lima Peru
- Carrera de Biologia Marina, Universidad Cientifica del Sur Lima Peru
- Marine Turtle Research Group, Centre for Ecology and Conservation University of Exeter Penryn UK
| | - Jeffrey C. Mangel
- ProDelphinus Lima Peru
- Marine Turtle Research Group, Centre for Ecology and Conservation University of Exeter Penryn UK
| | | | - Javier Quinones Davila
- Oficina de Investigaciones en Depredadores Superiores Instituto del Mar del Perú, Chucuito Callao Peru
| | | | - Juan M. Rguez‐Baron
- JUSTSEA Foundation Bogotá Colombia
- Department of Biology and Marine Biology University of North Carolina Wilmington Wilmington North Carolina USA
| | - Christina Fahy
- Protected Resources Division West Coast Regional Office, National Marine Fisheries Service Long Beach California USA
| | | | | | - Marino Abrego
- Ministerio de Ambiente de Panamá Universidad Marítima Internacional de Panamá Panama City Panama
| | - George L. Shillinger
- Upwell, Heritage Harbor Complex Monterey California USA
- MigraMar Bodega Bay California USA
| |
Collapse
|
9
|
Senko JF, Burgher KM, Del Mar Mancha-Cisneros M, Godley BJ, Kinan-Kelly I, Fox T, Humber F, Koch V, Smith AT, Wallace BP. Global patterns of illegal marine turtle exploitation. Glob Chang Biol 2022; 28:6509-6523. [PMID: 36069207 DOI: 10.1111/gcb.16378] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 07/12/2022] [Accepted: 07/12/2022] [Indexed: 06/15/2023]
Abstract
Human exploitation of wildlife for food, medicine, curios, aphrodisiacs, and spiritual artifacts represents a mounting 21st-century conservation challenge. Here, we provide the first global assessment of illegal marine turtle exploitation across multiple spatial scales (i.e., Regional Management Units [RMUs] and countries) by collating data from peer-reviewed studies, grey literature, archived media reports, and online questionnaires of in-country experts spanning the past three decades. Based on available information, we estimate that over 1.1 million marine turtles were exploited between 1990 and 2020 against existing laws prohibiting their use in 65 countries or territories and in 44 of the world's 58 marine turtle RMUs, with over 44,000 turtles exploited annually over the past decade. Exploitation across the 30-year period primarily consisted of green (56%) and hawksbill (39%) turtles when identified by species, with hawksbills (67%) and greens (81%) comprising the majority of turtles exploited in the 1990s and 2000s, respectively, and both species accounting for similar levels of exploitation in the 2010s. Although there were no clear overarching trends in the magnitude or spatial patterns of exploitation across the three decades, there was a 28% decrease in reported exploitation from the 2000s to the 2010s. The 10 RMUs with the highest exploitation in the 2010s included seven green and three hawksbill turtle RMUs, with most reported exploitation occurring in RMUs that typically exhibit a low risk of population decline or loss of genetic diversity. Over the past decade, the number of RMUs with "moderate" or "high" exploitation impact scores decreased. Our assessment suggests that illegal exploitation appears to have declined over the past decade and, with some exceptions, is primarily occurring in large, stable, and genetically diverse marine turtle populations.
Collapse
Affiliation(s)
- Jesse F Senko
- School for the Future of Innovation in Society, Arizona State University, Tempe, Arizona, USA
| | - Kayla M Burgher
- School of Life Sciences, Arizona State University, Tempe, Arizona, USA
| | | | - Brendan J Godley
- Marine Turtle Research Group, Centre for Ecology and Conservation, University of Exeter, Penryn, UK
| | - Irene Kinan-Kelly
- NOAA Fisheries, Pacific Islands Regional Office, Honolulu, Hawaii, USA
| | - Trevor Fox
- School of Life Sciences, Arizona State University, Tempe, Arizona, USA
| | - Frances Humber
- Marine Turtle Research Group, Centre for Ecology and Conservation, University of Exeter, Penryn, UK
- Blue Ventures Conservation, London, UK
| | - Volker Koch
- Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH, Eschborn, Germany
| | - Andrew T Smith
- School of Life Sciences, Arizona State University, Tempe, Arizona, USA
| | - Bryan P Wallace
- Ecolibrium, Inc., Boulder, Colorado, USA
- Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, Colorado, USA
| |
Collapse
|
10
|
Rose SA, Bates EB, McNaughton AN, O'Hara KJ, Barco SG. Characterizing Sea Turtle Bycatch in the Recreational Hook and Line Fishery in Southeastern Virginia, USA. Chelonian Conservation and Biology 2022. [DOI: 10.2744/ccb-1476.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sarah A. Rose
- Virginia Aquarium & Marine Science Center Foundation, 717 General Booth Boulevard, Virginia Beach, Virginia 23451 USA [; ; ; ]
| | - Erin B. Bates
- Virginia Aquarium & Marine Science Center Foundation, 717 General Booth Boulevard, Virginia Beach, Virginia 23451 USA [; ; ; ]
| | - Allyson N. McNaughton
- Virginia Aquarium & Marine Science Center Foundation, 717 General Booth Boulevard, Virginia Beach, Virginia 23451 USA [; ; ; ]
| | - Kathryn J. O'Hara
- Virginia Aquarium & Marine Science Center Foundation, 717 General Booth Boulevard, Virginia Beach, Virginia 23451 USA [; ; ; ]
| | - Susan G. Barco
- Virginia Aquarium & Marine Science Center Foundation, 717 General Booth Boulevard, Virginia Beach, Virginia 23451 USA [; ; ; ]
| |
Collapse
|
11
|
Dodge KL, Landry S, Lynch B, Innis CJ, Sampson K, Sandilands D, Sharp B. Disentanglement network data to characterize leatherback sea turtle Dermochelys coriacea bycatch in fixed-gear fisheries. ENDANGER SPECIES RES 2022. [DOI: 10.3354/esr01173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
To characterize sea turtle bycatch in fixed-gear fisheries in Massachusetts, USA, we analyzed a 15 yr dataset of entanglement reports and detailed documentation from disentanglement operations. Almost all (272) of the 280 confirmed entanglements involved leatherback turtles Dermochelys coriacea. The majority of turtles were entangled in actively fished (96%), commercial (94%) pot/trap gear with unbroken/untriggered weak links, specifically the buoy lines marking lobster, whelk, and fish traps. Most reports came from recreational boaters (62%) and other sources (26%), rather than commercial fishers (12%). Leatherback entanglements occurred from May to November, with peak reporting in August, and included adult males, adult females, and subadults. All entanglements involved the turtle’s neck and/or front flippers, with varying degrees of visible injuries; 47 entangled leatherbacks were dead in gear, 224 were alive at first sighting, and 1 case was unknown. Post-release monitoring suggested turtles can survive for days to years after disentanglement, but data were limited. While the observed entanglements in our study are low relative to global bycatch, these numbers should be considered a minimum. Our findings are comparable to observed numbers of leatherbacks taken in Canadian fixed-gear fisheries, and represent just one of multiple, cumulative threats in the North Atlantic. Managers should focus on strategies to reduce the co-occurrence of sea turtles and fixed-fishing gear, including reductions in the number of buoy lines allowed (e.g. replace single sets with trawls), seasonal and area closures targeted to reduce sea turtle-gear interaction, and encourage the development of emerging technologies such as ‘ropeless’ fishing.
Collapse
Affiliation(s)
- KL Dodge
- Anderson Cabot Center for Ocean Life, New England Aquarium, Boston, MA 02110, USA
| | - S Landry
- Center for Coastal Studies, Provincetown, MA 02657, USA
| | - B Lynch
- Center for Coastal Studies, Provincetown, MA 02657, USA
| | - CJ Innis
- Anderson Cabot Center for Ocean Life, New England Aquarium, Boston, MA 02110, USA
- Animal Health Department, New England Aquarium, Boston, MA 02110, USA
| | - K Sampson
- National Marine Fisheries Service, Greater Atlantic Region, Gloucester, MA 01930, USA
| | - D Sandilands
- Center for Coastal Studies, Provincetown, MA 02657, USA
| | - B Sharp
- Center for Coastal Studies, Provincetown, MA 02657, USA
- International Fund for Animal Welfare, Yarmouth Port, MA 02675, USA
| |
Collapse
|
12
|
Charrier I, Jeantet L, Maucourt L, Régis S, Lecerf N, Benhalilou A, Chevallier D. First evidence of underwater vocalisations in green sea turtles Chelonia mydas. ENDANGER SPECIES RES 2022. [DOI: 10.3354/esr01185] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
13
|
Lockley EC, Eizaguirre C. Effects of global warming on species with temperature-dependent sex determination: Bridging the gap between empirical research and management. Evol Appl 2021; 14:2361-2377. [PMID: 34745331 PMCID: PMC8549623 DOI: 10.1111/eva.13226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 03/05/2021] [Accepted: 03/11/2021] [Indexed: 12/31/2022] Open
Abstract
Global warming could threaten over 400 species with temperature-dependent sex determination (TSD) worldwide, including all species of sea turtle. During embryonic development, rising temperatures might lead to the overproduction of one sex and, in turn, could bias populations' sex ratios to an extent that threatens their persistence. If climate change predictions are correct, and biased sex ratios reduce population viability, species with TSD may go rapidly extinct unless adaptive mechanisms, whether behavioural, physiological or molecular, exist to buffer these temperature-driven effects. Here, we summarize the discovery of the TSD phenomenon and its still elusive evolutionary significance. We then review the molecular pathways underpinning TSD in model species, along with the hormonal mechanisms that interact with temperatures to determine an individual's sex. To illustrate evolutionary mechanisms that can affect sex determination, we focus on sea turtle biology, discussing both the adaptive potential of this threatened TSD taxon, and the risks associated with conservation mismanagement.
Collapse
Affiliation(s)
- Emma C. Lockley
- School of Biological and Chemical SciencesQueen Mary University LondonLondonUK
| | | |
Collapse
|
14
|
Lima EHSM, Awabdi DR, Melo MTD, Giffoni B, Bugoni L. Nonlethal capture of green sea turtles (Chelonia mydas) in fishing weirs as an opportunity for population studies and conservation. Mar Environ Res 2021; 170:105437. [PMID: 34364056 DOI: 10.1016/j.marenvres.2021.105437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 07/19/2021] [Accepted: 07/23/2021] [Indexed: 06/13/2023]
Abstract
Green sea turtles (Chelonia mydas) switch habitats during their development, moving from pelagic to neritic areas and then commuting between nesting and foraging grounds during adulthood. Due to their predominantly coastal habitats, they are under a range of anthropogenic threats. We monitored turtles incidentally captured in fishing weirs in Ceará state, northeastern Brazil, over a decade and provided an overview of capture rates in the fishery during previous decades. Between 2008 and 2018, 2335 captures were recorded, 76% were only once. Most recaptures (86%) occurred up to six months after the first capture, with a mean growth rate of 6.7 ± 3.6 cm year-1. Capture rates varied between years, with the highest rates during the historical period, peaking in 1962 (0.16 turtles day weir-1). Between 2008 and 2018, the daily capture rate was 0.07 turtles day weir-1. Similar to other areas, the use of turtles as a fishery resource seems to have reduced population sizes in the Atlantic Ocean. On the other hand, the intensive monitoring of local weirs provided an opportunity to mobilize the community regarding their conservation, which in turn could have supported the recovery of turtles from a number of distant colonies. The relatively constant and year-round capture of green sea turtles reflects the presence of individuals from different rookeries and demonstrates the importance of the region as a developmental ground for juveniles from different nesting areas, with high growth rates compared with other feeding areas. Partnership with local fishermen and the long-term monitoring of passive nonlethal fishing weirs are key tools in supporting sea turtle conservation.
Collapse
Affiliation(s)
| | - Danielle Rodrigues Awabdi
- Laboratório de Aves Aquáticas e Tartarugas Marinhas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande (FURG), Campus Carreiros, Av. Itália s/n, 96203-900, Rio Grande, RS, Brazil.
| | | | - Bruno Giffoni
- Fundação Projeto Tamar, PO Box 3348, 59082-971, Natal, RN, Brazil.
| | - Leandro Bugoni
- Laboratório de Aves Aquáticas e Tartarugas Marinhas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande (FURG), Campus Carreiros, Av. Itália s/n, 96203-900, Rio Grande, RS, Brazil.
| |
Collapse
|
15
|
Patel SH, Winton MV, Hatch JM, Haas HL, Saba VS, Fay G, Smolowitz RJ. Projected shifts in loggerhead sea turtle thermal habitat in the Northwest Atlantic Ocean due to climate change. Sci Rep 2021; 11:8850. [PMID: 33893380 PMCID: PMC8065110 DOI: 10.1038/s41598-021-88290-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Accepted: 03/31/2021] [Indexed: 11/24/2022] Open
Abstract
It is well established that sea turtles are vulnerable to atmospheric and oceanographic shifts associated with climate change. However, few studies have formally projected how their seasonal marine habitat may shift in response to warming ocean temperatures. Here we used a high-resolution global climate model and a large satellite tagging dataset to project changes in the future distribution of suitable thermal habitat for loggerheads along the northeastern continental shelf of the United States. Between 2009 and 2018, we deployed 196 satellite tags on loggerheads within the Middle Atlantic Bight (MAB) of the Northwest Atlantic continental shelf region, a seasonal foraging area. Tag location data combined with depth and remotely sensed sea surface temperature (SST) were used to characterize the species’ current thermal range in the MAB. The best-fitting model indicated that the habitat envelope for tagged loggerheads consisted of SST ranging from 11.0° to 29.7 °C and depths between 0 and 105.0 m. The calculated core bathythermal range consisted of SSTs between 15.0° and 28.0 °C and depths between 8.0 and 92.0 m, with the highest probability of presence occurred in regions with SST between 17.7° and 25.3 °C and at depths between 26.1 and 74.2 m. This model was then forced by a high-resolution global climate model under a doubling of atmospheric CO2 to project loggerhead probability of presence over the next 80 years. Our results suggest that loggerhead thermal habitat and seasonal duration will likely increase in northern regions of the NW Atlantic shelf. This change in spatiotemporal range for sea turtles in a region of high anthropogenic use may prompt adjustments to the localized protected species conservation measures.
Collapse
Affiliation(s)
- Samir H Patel
- Coonamessett Farm Foundation, 277 Hatchville Road, East Falmouth, MA, 02536, USA.
| | - Megan V Winton
- School for Marine Science and Technology, University of Massachusetts Dartmouth, 836 S Rodney French Blvd, New Bedford, MA, 02744, USA.,Atlantic White Shark Conservancy, 235 Orleans Road, North Chatham, MA, 02650, USA
| | - Joshua M Hatch
- Northeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 166 Water Street, Woods Hole, MA, 02543, USA
| | - Heather L Haas
- Northeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 166 Water Street, Woods Hole, MA, 02543, USA
| | - Vincent S Saba
- Geophysical Fluid Dynamics Laboratory, Northeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Princeton University Forrestal Campus, 201 Forrestal Road, Princeton, NJ, 08544, USA
| | - Gavin Fay
- School for Marine Science and Technology, University of Massachusetts Dartmouth, 836 S Rodney French Blvd, New Bedford, MA, 02744, USA
| | - Ronald J Smolowitz
- Coonamessett Farm Foundation, 277 Hatchville Road, East Falmouth, MA, 02536, USA
| |
Collapse
|
16
|
Robinson DP, Hyland K, Beukes G, Vettan A, Mabadikate A, Jabado RW, Rohner CA, Pierce SJ, Baverstock W. Satellite tracking of rehabilitated sea turtles suggests a high rate of short-term survival following release. PLoS One 2021; 16:e0246241. [PMID: 33592007 PMCID: PMC7886132 DOI: 10.1371/journal.pone.0246241] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Accepted: 01/15/2021] [Indexed: 11/20/2022] Open
Abstract
The rehabilitation of wildlife can contribute directly to the conservation of threatened species by helping to maintain wild populations. This study focused on determining the post-rehabilitation survival and spatial ecology of sea turtles and on comparing the movements of individuals with flipper amputations (amputees) to non-amputee animals. Our aims were to assess whether rehabilitated sea turtles survive after release, to compare and contrast the movement characteristics of the different species of sea turtles we tracked, and to examine whether amputees and non-amputees within species behaved similarly post-release. Twenty-six rehabilitated sea turtles from four species, including hawksbill Eretmochelys imbricata (n = 12), loggerhead Caretta caretta (n = 11), green Chelonia mydas (n = 2), and olive ridley Lepidochelys olivacea (n = 1) sea turtles from the United Arab Emirates were fitted with satellite tags before release. Rehabilitation times ranged from 89 to 817 days (mean 353 ± 237 days). Post-release movements and survival were monitored for 8 to 387 days (mean 155 ± 95 days) through satellite tracking. Tag data suggested that three tracked sea turtles died within four days of release, one after 27 days, and one after 192 days from what are thought to be anthropogenic factors unrelated to their pre-rehabilitation ailments. We then compared habitat use and movement characteristics among the different sea turtle species. Although half of all turtles crossed one or more international boundaries, dispersal varied among species. Loggerhead turtles had a high dispersal, with 80% crossing an international boundary, while hawksbill turtles displayed higher post-release residency, with 66% remaining within UAE territorial waters. Amputee turtles moved similarly to non-amputee animals of the same species. Loggerhead turtles travelled faster (mean ± sd = 15.3 ± 8 km/day) than hawksbill turtles (9 ± 7 km/day). Both amputee and non-amputee sea turtles within a species moved similarly. Our tracking results highlight that rehabilitated sea turtles, including amputees, can successfully survive in the wild following release for up to our ~one-year monitoring time therefore supporting the suitability for release of sea turtles that have recovered from major injuries such as amputations. However, more broadly, the high mortality from anthropogenic factors in the Arabian Gulf region is clearly a serious issue and conservation challenge.
Collapse
Affiliation(s)
- David P. Robinson
- Dubai Turtle Rehabilitation Project, Dubai, UAE
- Sundive Research, Byron Bay, NSW, Australia
- Marine Megafauna Foundation, Truckee, CA, United States of America
| | - Kevin Hyland
- Dubai Turtle Rehabilitation Project, Dubai, UAE
- Wildlife Protection Office, Dubai, UAE
| | - Gerhard Beukes
- Dubai Turtle Rehabilitation Project, Dubai, UAE
- Jumeirah Group, Dubai, UAE
| | - Abdulkareem Vettan
- Dubai Turtle Rehabilitation Project, Dubai, UAE
- Jumeirah Group, Dubai, UAE
| | | | | | | | - Simon J. Pierce
- Marine Megafauna Foundation, Truckee, CA, United States of America
| | - Warren Baverstock
- Dubai Turtle Rehabilitation Project, Dubai, UAE
- Amaala, Riyadh, Kingdom of Saudi Arabia
| |
Collapse
|
17
|
Morales-Zárate M, López-Ramírez J, Salinas-Zavala C. Loggerhead marine turtle (Caretta caretta) ecological facts from a trophic relationship model in a hot spot fishery area: Gulf of Ulloa, Mexico. Ecol Modell 2021. [DOI: 10.1016/j.ecolmodel.2020.109327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
18
|
Maggeni R, Feeney WE. Insights into the successful breeding of Hawksbill sea turtles (Eretmochelys imbricata) from a long-term captive breeding program. Glob Ecol Conserv 2020. [DOI: 10.1016/j.gecco.2020.e01278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
|
19
|
Benson SR, Forney KA, Moore JE, LaCasella EL, Harvey JT, Carretta JV. A long-term decline in the abundance of endangered leatherback turtles, Dermochelys coriacea, at a foraging ground in the California Current Ecosystem. Glob Ecol Conserv 2020. [DOI: 10.1016/j.gecco.2020.e01371] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
20
|
Jeantet L, Planas-Bielsa V, Benhamou S, Geiger S, Martin J, Siegwalt F, Lelong P, Gresser J, Etienne D, Hiélard G, Arque A, Regis S, Lecerf N, Frouin C, Benhalilou A, Murgale C, Maillet T, Andreani L, Campistron G, Delvaux H, Guyon C, Richard S, Lefebvre F, Aubert N, Habold C, le Maho Y, Chevallier D. Behavioural inference from signal processing using animal-borne multi-sensor loggers: a novel solution to extend the knowledge of sea turtle ecology. R Soc Open Sci 2020; 7:200139. [PMID: 32537218 PMCID: PMC7277266 DOI: 10.1098/rsos.200139] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 04/17/2020] [Indexed: 06/10/2023]
Abstract
The identification of sea turtle behaviours is a prerequisite to predicting the activities and time-budget of these animals in their natural habitat over the long term. However, this is hampered by a lack of reliable methods that enable the detection and monitoring of certain key behaviours such as feeding. This study proposes a combined approach that automatically identifies the different behaviours of free-ranging sea turtles through the use of animal-borne multi-sensor recorders (accelerometer, gyroscope and time-depth recorder), validated by animal-borne video-recorder data. We show here that the combination of supervised learning algorithms and multi-signal analysis tools can provide accurate inferences of the behaviours expressed, including feeding and scratching behaviours that are of crucial ecological interest for sea turtles. Our procedure uses multi-sensor miniaturized loggers that can be deployed on free-ranging animals with minimal disturbance. It provides an easily adaptable and replicable approach for the long-term automatic identification of the different activities and determination of time-budgets in sea turtles. This approach should also be applicable to a broad range of other species and could significantly contribute to the conservation of endangered species by providing detailed knowledge of key animal activities such as feeding, travelling and resting.
Collapse
Affiliation(s)
- Lorène Jeantet
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | - Víctor Planas-Bielsa
- Centre Scientifique de Monaco, Département de Biologie Polaire, 8 quai Antoine Ier, MC 98000Monaco
| | - Simon Benhamou
- Centre d’Écologie Fonctionnelle et Évolutive, CNRS, Montpellier, France & Cogitamus Lab
| | - Sebastien Geiger
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | - Jordan Martin
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | - Flora Siegwalt
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | - Pierre Lelong
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | - Julie Gresser
- DEAL Martinique, Pointe de Jaham, BP 7212, 97274 Schoelcher Cedex, France
| | - Denis Etienne
- DEAL Martinique, Pointe de Jaham, BP 7212, 97274 Schoelcher Cedex, France
| | - Gaëlle Hiélard
- Office de l'Eau Martinique, 7 Avenue Condorcet, BP 32, 97201 Fort-de-France, Martinique, France
| | - Alexandre Arque
- Office de l'Eau Martinique, 7 Avenue Condorcet, BP 32, 97201 Fort-de-France, Martinique, France
| | - Sidney Regis
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | - Nicolas Lecerf
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | - Cédric Frouin
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | | | - Céline Murgale
- Association POEMM, 73 lot papayers, Anse a l'âne, 97229 Les Trois Ilets, Martinique
| | - Thomas Maillet
- Association POEMM, 73 lot papayers, Anse a l'âne, 97229 Les Trois Ilets, Martinique
| | - Lucas Andreani
- Association POEMM, 73 lot papayers, Anse a l'âne, 97229 Les Trois Ilets, Martinique
| | - Guilhem Campistron
- Association POEMM, 73 lot papayers, Anse a l'âne, 97229 Les Trois Ilets, Martinique
| | - Hélène Delvaux
- DEAL Guyane, Rue Carlos Finley, CS 76003, 97306 Cayenne Cedex, France
| | - Christelle Guyon
- DEAL Guyane, Rue Carlos Finley, CS 76003, 97306 Cayenne Cedex, France
| | - Sandrine Richard
- Centre National d'Etudes Spatiales, Centre Spatial Guyanais, BP 726, 97387 Kourou Cedex, Guyane
| | - Fabien Lefebvre
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | - Nathalie Aubert
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | - Caroline Habold
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| | - Yvon le Maho
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
- Centre Scientifique de Monaco, Département de Biologie Polaire, 8 quai Antoine Ier, MC 98000Monaco
| | - Damien Chevallier
- Institut Pluridisciplinaire Hubert Curien, CNRS–Unistra, 67087 Strasbourg, France
| |
Collapse
|
21
|
Schofield G, Klaassen M, Papafitsoros K, Lilley MKS, Katselidis KA, Hays GC. Long-term photo-id and satellite tracking reveal sex-biased survival linked to movements in an endangered species. Ecology 2020; 101:e03027. [PMID: 32096220 DOI: 10.1002/ecy.3027] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 01/14/2020] [Accepted: 01/30/2020] [Indexed: 12/27/2022]
Abstract
Sex-biased survival linked to anthropogenic threats places populations at risk. We show the utility of long-term multidecadal photo-identification (photo-id) combined with long-term high-resolution (Fastloc-GPS) satellite telemetry to investigate the links between mortality rates and patterns of movement for a wide-ranging, endangered marine vertebrate. Using a photo-identification database of 947 loggerhead turtles (Caretta caretta) compiled over 18 yr, we estimated greater annual survival rates of females (0.89; 95% confidence interval [CI] 0.87-0.90) compared to males (0.73; 95% CI 0.67-0.78). For males satellite-tracked across multiple breeding seasons, 100% (26 of 26) returned to the same breeding site, suggesting the calculated lower male survival rate was likely not due to emigration to breed elsewhere. 10,111 and 2,524 tracking days for males (n = 39 individuals) and females (n = 18 individuals), respectively, revealed different habitat-use patterns outside the breeding season: males tended to occupy foraging sites closer to shore and closer to breeding sites but, due to their generally annual breeding, compared to biennial breeding for females, males migrated further per year on average. These differences in movement patterns likely contribute to higher mortality in males through increased interaction with anthropogenic threats. Long-term identification coupled with tracking offers great promise for estimating the survival rates of other wide-ranging species.
Collapse
Affiliation(s)
- Gail Schofield
- School of Biological and Chemical Sciences, Queen Mary University of London, London, E1 4NS, UK
| | - Marcel Klaassen
- School of Life and Environmental Sciences, Deakin University, Geelong, Victoria, 3280, Australia
| | - Kostas Papafitsoros
- Weierstrass Institute for Applied Analysis and Stochastics, Mohrenstrasse 39, 10117, Berlin, Germany.,ARCHELON, The Sea Turtle Protection Society of Greece, Solomou 57, GR-10432, Athens, Greece
| | - Martin K S Lilley
- College of Life and Environmental Sciences, University of Exeter, Geoffrey Pope Building, Stocker Road, Exeter, Devon, EX4 4QD, UK
| | - Kostas A Katselidis
- National Marine Park of Zakynthos, 1 Eleftheriou Venizelou Street GR29100, Zakynthos, Greece
| | - Graeme C Hays
- School of Life and Environmental Sciences, Deakin University, Geelong, Victoria, 3280, Australia
| |
Collapse
|
22
|
Parga ML, Crespo-Picazo JL, Monteiro D, García-Párraga D, Hernandez JA, Swimmer Y, Paz S, Stacy NI. On-board study of gas embolism in marine turtles caught in bottom trawl fisheries in the Atlantic Ocean. Sci Rep 2020; 10:5561. [PMID: 32221339 DOI: 10.1038/s41598-020-62355-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 02/28/2020] [Indexed: 11/09/2022] Open
Abstract
Decompression sickness (DCS) was first diagnosed in marine turtles in 2014. After capture in net fisheries, animals typically start showing clinical evidence of DCS hours after being hauled on-board, often dying if untreated. These turtles are normally immediately released without any understanding of subsequent clinical problems or outcome. The objectives of this study were to describe early occurrence and severity of gaseous embolism (GE) and DCS in marine turtles after incidental capture in trawl gear, and to provide estimates of on-board and post-release mortality. Twenty-eight marine turtles were examined on-board fishing vessels. All 20 turtles assessed by ultrasound and/or post-mortem examination developed GE, independent of season, depth and duration of trawl and ascent speed. Gas emboli were obvious by ultrasound within 15 minutes after surfacing and worsened over the course of 2 hours. Blood data were consistent with extreme lactic acidosis, reduced glomerular filtration, and stress. Twelve of 28 (43%) animals died on-board, and 3 of 15 (20%) active turtles released with satellite tags died within 6 days. This is the first empirically-based estimate of on-board and post-release mortality of bycaught marine turtles that has until now been unaccounted for in trawl fisheries not equipped with turtle excluder devices.
Collapse
|
23
|
Ábrego ME, Acuña-Perales N, Alfaro-Shigueto J, Azócar J, Barragán Rocha AR, Baquero A, Cotto A, Darquea J, de Paz N, Donoso M, Dutton PH, Fonseca L, Gadea V, García D, Genovart M, Jimenez A, del Rosario Juárez M, López Sánchez KC, Mangel JC, Martínez Suzano ML, Miranda C, Ocampo E, Ordaz Becerra A, Ortiz-Alvarez C, Paladino FV, Pasara-Polack A, Pingo S, Piedra Chacón R, Quiñones J, Rguez-Baron JM, Salas Jiménez JC, Salazar H, Santidrián Tomillo P, Sarti Martínez AL, Spotila JR, Tavera A, Urteaga J, Vallejo F, Velez E, Wallace BP, Williard AS, Zárate PM. Enhanced, coordinated conservation efforts required to avoid extinction of critically endangered Eastern Pacific leatherback turtles. Sci Rep 2020; 10:4772. [PMID: 32179757 PMCID: PMC7075994 DOI: 10.1038/s41598-020-60581-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 02/11/2020] [Indexed: 11/09/2022] Open
Abstract
Failure to improve the conservation status of endangered species is often related to inadequate allocation of conservation resources to highest priority issues. Eastern Pacific (EP) leatherbacks are perhaps the most endangered sea turtle population in the world, and continue on a path to regional extinction. To provide coherent, regional conservation targets, we developed a population viability analysis and examined hypothetical scenarios describing effects of conservation activities that either reduced mortality or increased production of hatchlings (or both). Under status quo conditions, EP leatherbacks will be extirpated in <60 yr. To ensure a positive, long-term population trajectory, conservation efforts must increase adult survivorship (i.e., reduce adult mortality) by ≥20%, largely through reduction of fisheries bycatch mortality. Positive trajectories can be accelerated by increased production of hatchlings through enhanced nest protection and treatment. We estimate that these efforts must save approximately 200-260 adult and subadult leatherbacks and produce approximately 7,000-8,000 more hatchlings annually. Critically, reductions in late-stage mortality must begin within 5 years and reach 20% overall within the next 10-15 years to ensure population stabilization and eventual increase. These outcomes require expanded, sustained, coordinated, high-priority efforts among several entities working at multiple scales. Fortunately, such efforts are underway.
Collapse
|
24
|
López-Mendilaharsu M, Giffoni B, Monteiro D, Prosdocimi L, Vélez-Rubio GM, Fallabrino A, Estrades A, Santos AS, Lara PH, Pires T, Tiwari M, Bolten AB, Marcovaldi MÂ. Multiple-threats analysis for loggerhead sea turtles in the southwest Atlantic Ocean. ENDANGER SPECIES RES 2020. [DOI: 10.3354/esr01025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Priority-setting approaches for widely distributed and long-lived species can be challenging. This is especially true for sea turtles, which are species of conservation concern. The aim of this study was to conduct a detailed analysis of threats to identify, quantify and prioritize the main impacts to the loggerhead Caretta caretta population in the southwest Atlantic (SWA) region. A matrix of relative threats was constructed. Threats were identified and classified for 8 different life stages (nesting females, eggs, hatchlings, swim-frenzy transitional stage, juveniles-neritic, juveniles-oceanic, adults-neritic, adults-oceanic) and for 3 ecosystems inhabited by sea turtles (terrestrial, neritic and oceanic). Results indicated that fisheries bycatch represents a major threat for loggerheads in the SWA. The trawl fishery was identified as the main source of mortality for neritic juvenile and adult turtles, whereas juveniles in oceanic areas are mostly impacted by surface longlines. In terrestrial environments, eggs and hatchlings are mainly affected by habitat alteration and by native and exotic predators. Loggerheads have shown a positive nesting trend at their main nesting beaches in the SWA, probably due to long-term conservation efforts to reduce mortality of the different life stages within the terrestrial zone. However, the high mortality rates of juveniles and sub-adults documented at some known foraging grounds represent a reason for concern, as this may affect the overall population trend in the future. This threat analysis provides a tool to review the goals of national action plans, prioritize actions and optimize the allocation of management resources.
Collapse
Affiliation(s)
- M López-Mendilaharsu
- Fundação Pró-Tamar, Rua Rubens Guelli 134/ 307, Itaigara - Salvador, CEP: 41815-135 Bahia, Brazil
| | - B Giffoni
- Fundação Pró-Tamar, Rua Rubens Guelli 134/ 307, Itaigara - Salvador, CEP: 41815-135 Bahia, Brazil
| | - D Monteiro
- Núcleo de Educação e Monitoramento Ambiental - NEMA, Rua Maria Araújo 450, 96207-480 Rio Grande, RS, Brazil
- Laboratório de Ecologia e Conservação da Megafauna Marinha, EcoMega, Universidade Federal do Rio Grande, FURG, 96203-900 Rio Grande, RS, Brazil
| | - L Prosdocimi
- Programa Regional de Investigación y Conservación de Tortugas Marinas de la Argentina (PRICTMA), 1609 Buenos Aires, Argentina
| | - GM Vélez-Rubio
- Karumbé NGO, Zoo Villa Dolores, 11600 Montevideo, Uruguay
- Centro Universitario Regional del Este (CURE), Universidad de la República, 27000 Rocha, Uruguay
| | - A Fallabrino
- Karumbé NGO, Zoo Villa Dolores, 11600 Montevideo, Uruguay
| | - A Estrades
- Karumbé NGO, Zoo Villa Dolores, 11600 Montevideo, Uruguay
| | - AS Santos
- Fundação Pró-Tamar, Rua Rubens Guelli 134/ 307, Itaigara - Salvador, CEP: 41815-135 Bahia, Brazil
| | - PH Lara
- Fundação Pró-Tamar, Rua Rubens Guelli 134/ 307, Itaigara - Salvador, CEP: 41815-135 Bahia, Brazil
| | - T Pires
- Fundação Pró-Tamar, Rua Rubens Guelli 134/ 307, Itaigara - Salvador, CEP: 41815-135 Bahia, Brazil
| | - M Tiwari
- NOAA-National Marine Fisheries Service, Marine Turtle Ecology & Assessment Program, Southwest Fisheries Science Center, La Jolla, California 92034, USA
| | - AB Bolten
- Archie Carr Center for Sea Turtle Research and Department of Biology, University of Florida, Gainesville, Florida 32611, USA
| | - MÂ Marcovaldi
- Fundação Pró-Tamar, Rua Rubens Guelli 134/ 307, Itaigara - Salvador, CEP: 41815-135 Bahia, Brazil
| |
Collapse
|
25
|
Casale P, Ceriani SA. Sea turtle populations are overestimated worldwide from remigration intervals: correction for bias. ENDANGER SPECIES RES 2020. [DOI: 10.3354/esr01019] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
26
|
Warraich N, Wyneken J, Blume N. Feeding behavior and visual field differences in loggerhead and leatherback sea turtles may explain differences in longline fisheries interactions. ENDANGER SPECIES RES 2020. [DOI: 10.3354/esr01012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
27
|
Ceriani SA, Casale P, Brost M, Leone EH, Witherington BE. Conservation implications of sea turtle nesting trends: elusive recovery of a globally important loggerhead population. Ecosphere 2019. [DOI: 10.1002/ecs2.2936] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- S. A. Ceriani
- Florida Fish and Wildlife Conservation Commission Fish and Wildlife Research Institute Saint Petersburg Florida 33701 USA
| | - P. Casale
- Department of Biology University of Pisa Pisa Italy
| | - M. Brost
- Florida Fish and Wildlife Conservation Commission Fish and Wildlife Research Institute Saint Petersburg Florida 33701 USA
| | - E. H. Leone
- Florida Fish and Wildlife Conservation Commission Fish and Wildlife Research Institute 1105 SW Williston Road Gainesville Florida 32601 USA
| | | |
Collapse
|
28
|
Vandeperre F, Parra H, Pham CK, Machete M, Santos M, Bjorndal KA, Bolten AB. Relative abundance of oceanic juvenile loggerhead sea turtles in relation to nest production at source rookeries: implications for recruitment dynamics. Sci Rep 2019; 9:13019. [PMID: 31506566 DOI: 10.1038/s41598-019-49434-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Accepted: 08/23/2019] [Indexed: 11/08/2022] Open
Abstract
After hatching, juveniles of most sea turtle species undertake long migrations across ocean basins and remain in oceanic habitats for several years. Assessing population abundance and demographic parameters during this oceanic stage is challenging. Two long-recognized deficiencies in population assessment are (i) reliance on trends in numbers of nests or reproductive females at nesting beaches and (ii) ignorance of factors regulating recruitment to the early oceanic stage. To address these critical gaps, we examined 15 years of standardized loggerhead sighting data collected opportunistically by fisheries observers in the Azores archipelago. From 2001 to 2015, 429 loggerheads were sighted during 67,922 km of survey effort. We used a model-based approach to evaluate the influence of environmental factors and present the first estimates of relative abundance of oceanic-stage juvenile sea turtles. During this period, relative abundance of loggerheads in the Azores tracked annual nest abundance at source rookeries in Florida when adjusted for a 3-year lag. This concurrence of abundance patterns indicates that recruitment to the oceanic stage is more dependent on nest abundance at source rookeries than on stochastic processes derived from short term climatic variability, as previously believed.
Collapse
|
29
|
Colman LP, Thomé JCA, Almeida A, Baptistotte C, Barata PCR, Broderick AC, Ribeiro FA, Vila-Verde L, Godley BJ. Thirty years of leatherback turtle Dermochelys coriacea nesting in Espírito Santo, Brazil, 1988-2017: reproductive biology and conservation. ENDANGER SPECIES RES 2019. [DOI: 10.3354/esr00961] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
30
|
Chapman PA, Cribb TH, Flint M, Traub RJ, Blair D, Kyaw-Tanner MT, Mills PC. Spirorchiidiasis in marine turtles: the current state of knowledge. Dis Aquat Organ 2019; 133:217-245. [PMID: 31187736 DOI: 10.3354/dao03348] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Blood flukes of the family Spirorchiidae are important disease agents in marine turtles. The family is near cosmopolitan in distribution. Twenty-nine marine species across 10 genera are currently recognized, but taxonomic problems remain and it is likely that more species will be discovered. Spirorchiids infect the circulatory system, where they and their eggs cause a range of inflammatory lesions. Infection is sometimes implicated in the death of the turtle. In some regions, prevalence in stranded turtles is close to 100%. Knowledge of life cycles, important for control and epidemiological studies, has proven elusive until recently, when the first intermediate host identifications were made. Recent molecular studies of eggs and adult worms indicate that a considerable level of intrageneric and intraspecific diversity exists. The characterization of this diversity is likely to be of importance in exploring parasite taxonomy and ecology, unravelling life cycles, identifying the differential pathogenicity of genotypes and species, and developing antemortem diagnostic tools, all of which are major priorities for future spirorchiid research. Diagnosis to date has been reliant on copromicroscopy or necropsy, which both have significant limitations. The current lack of reliable antemortem diagnostic options is a roadblock to determining the true prevalence and epidemiology of spirorchiidiasis and the development of effective treatment regimes.
Collapse
Affiliation(s)
- Phoebe A Chapman
- Veterinary-Marine Animal Research, Teaching and Investigation, School of Veterinary Science, The University of Queensland, Gatton, Queensland 4343, Australia
| | | | | | | | | | | | | |
Collapse
|
31
|
Wildermann NE, Gredzens C, Avens L, Barrios-Garrido HA, Bell I, Blumenthal J, Bolten AB, Braun McNeill J, Casale P, Di Domenico M, Domit C, Epperly SP, Godfrey MH, Godley BJ, González-Carman V, Hamann M, Hart KM, Ishihara T, Mansfield KL, Metz TL, Miller JD, Pilcher NJ, Read MA, Sasso C, Seminoff JA, Seney EE, Willard AS, Tomás J, Vélez-Rubio GM, Ware M, Williams JL, Wyneken J, Fuentes MMPB. Informing research priorities for immature sea turtles through expert elicitation. ENDANGER SPECIES RES 2018. [DOI: 10.3354/esr00916] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
32
|
|
33
|
Wallace BP, Zolkewitz M, James MC. Discrete, high-latitude foraging areas are important to energy budgets and population dynamics of migratory leatherback turtles. Sci Rep 2018; 8:11017. [PMID: 30030495 PMCID: PMC6054646 DOI: 10.1038/s41598-018-29106-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 07/02/2018] [Indexed: 11/09/2022] Open
Abstract
Many broadly distributed migratory species exhibit fidelity to fine-scale areas that support vital life history requirements (e.g., resource acquisition, reproduction). Thus, such areas are critical for population dynamics and are of high conservation priority. Leatherback sea turtles are among the world's most widely distributed species, and their breeding and feeding areas are typically separated by thousands of kilometres. In this study, we analysed turtle-borne video data on daytime feeding rates and energy acquisition in Nova Scotia, Canada, to quantify the importance of this discrete, seasonal foraging area for leatherback energy requirements. Based on daytime foraging only, we estimate that a single foraging season in Nova Scotia could support 59% of a non-breeding leatherback's annual energy budget, and 29% of energetic requirements for a female on a typical 2-year reproductive cycle. However, maximum energy intake rates for leatherbacks are nearly four times lower than those of mammals and birds due the low energy content of leatherbacks' gelatinous zooplankton prey. These results illustrate that high quality, local-scale foraging areas such as Nova Scotia are critically important to the stability and future growth of the leatherback population in the Northwest Atlantic Ocean. Thus, as with other migratory species, efforts to reduce threats and maintain habitat quality in such areas should be high conservation priorities.
Collapse
Affiliation(s)
- Bryan P Wallace
- Conservation Science Partners, Inc., 5 Old Town Square, Suite 205, Fort Collins, CO, 80524, USA. .,Nicholas School of the Environment, Duke University, Beaufort, NC, USA.
| | | | - Michael C James
- Population Ecology Division, Fisheries and Oceans Canada, Dartmouth, Nova Scotia, B2Y 4A2, Canada
| |
Collapse
|
34
|
Wildermann N, Sasso C, Gredzens C, Fuentes MMPB. Assessing the effect of recreational scallop harvest on the distribution and behaviour of foraging marine turtles. ORYX 2020; 54:307-14. [DOI: 10.1017/s0030605318000182] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
AbstractThe impact of fisheries on marine megafauna is widely known but most studies have focused on commercial fisheries, overlooking the effect of local recreational fisheries. This is particularly important for marine turtles in near-shore habitats that overlap with recreational fisheries. We assessed the effect of recreational scallop fisheries on the distribution and behaviour of foraging marine turtles in the coastal waters of the upper Eastern Gulf of Mexico. Before and during the scallop season we quantified the density and overlap of marine turtles and vessels sighted, and satellite tracked four turtles to assess their distribution and behaviour. The relative distribution of marine turtles sighted during the scallop season overlapped with 48% of the area most frequently used by harvesters, and marine turtle activity hotspots shifted between seasons. In addition, during the scallop season the home range size of individual turtles appeared to decrease, and turtles displayed frequent changes in travel speed and directionality. We hypothesize that such changes are probably related to the distribution and movement of vessels and the abundant presence of people in the water. Our study highlights the importance of considering recreational fisheries and their local effect on marine megafauna for informing future adaptive management practices. However, further studies are needed to quantify the direct and indirect impacts of recreational fisheries and to assess the degree of risk of associated activities to marine turtle populations.
Collapse
|
35
|
Mangel JC, Wang J, Alfaro-Shigueto J, Pingo S, Jimenez A, Carvalho F, Swimmer Y, Godley BJ. Illuminating gillnets to save seabirds and the potential for multi-taxa bycatch mitigation. R Soc Open Sci 2018; 5:180254. [PMID: 30109081 PMCID: PMC6083706 DOI: 10.1098/rsos.180254] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 06/04/2018] [Indexed: 05/31/2023]
Abstract
Bycatch in net fisheries is recognized as a major source of mortality for many marine species, including seabirds. Few mitigation solutions, however, have been identified. We assessed the effectiveness of illuminating fishing nets with green light emitting diodes (LEDs) to reduce the incidental capture of seabirds. Experiments were conducted in the demersal, set gillnet fishery of Constante, Peru and compared 114 pairs of control and illuminated nets. We observed captures of a total of 45 guanay cormorants (Phalacrocorax bougainvillii), with 39 caught in control nets and six caught in illuminated nets. Seabird bycatch in terms of catch-per-unit-effort was significantly (p < 0.05) higher in control nets than in illuminated nets, representing an 85.1% decline in the cormorant bycatch rate. This study, showing that net illumination reduces seabird bycatch and previous studies showing reductions in sea turtle bycatch without reducing target catch, indicates that net illumination can be an effective multi-taxa bycatch mitigation technique. This finding has broad implications for bycatch mitigation in net fisheries given LED technology's relatively low cost, the global ubiquity of net fisheries and the current paucity of bycatch mitigation solutions.
Collapse
Affiliation(s)
- Jeffrey C. Mangel
- ProDelphinus, Jose Galvez 780-E, Miraflores, Lima 18, Peru
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall TR10 9FE, UK
| | - John Wang
- NOAA, National Marine Fisheries Service, Pacific Islands Fisheries Science Center, Honolulu, HI 96818, USA
| | - Joanna Alfaro-Shigueto
- ProDelphinus, Jose Galvez 780-E, Miraflores, Lima 18, Peru
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall TR10 9FE, UK
- Facultad de Biologia Marina, Universidad Cientifica del Sur, Panamericana Sur Km 19, Villa, Lima, Peru
| | - Sergio Pingo
- ProDelphinus, Jose Galvez 780-E, Miraflores, Lima 18, Peru
| | - Astrid Jimenez
- ProDelphinus, Jose Galvez 780-E, Miraflores, Lima 18, Peru
| | - Felipe Carvalho
- NOAA, National Marine Fisheries Service, Pacific Islands Fisheries Science Center, Honolulu, HI 96818, USA
| | - Yonat Swimmer
- NOAA, National Marine Fisheries Service, Pacific Islands Fisheries Science Center, Honolulu, HI 96818, USA
| | - Brendan J. Godley
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall TR10 9FE, UK
| |
Collapse
|
36
|
Cuevas E, Guzmán-Hernández V, Uribe-Martínez A, Raymundo-Sánchez A, Herrera-Pavon R. Identification of Potential Sea Turtle Bycatch Hotspots Using a Spatially Explicit Approach in the Yucatan Peninsula, Mexico. Chelonian Conservation and Biology 2018. [DOI: 10.2744/ccb-1263.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Eduardo Cuevas
- Pronatura Península de Yucatán, calle 32 #269 x 47 y 47ª, Col. Pinzon II C.P. 97205, Mérida, México []
| | - Vicente Guzmán-Hernández
- Área de Protección de Flora y Fauna Laguna de Términos, Comisión Nacional de Áreas Naturales Protegidas, Av. Adolfo López Mateos, Prolongación Playa Norte, C.P. 24140, Ciudad del Carmen, Campeche, México []
| | - Abigail Uribe-Martínez
- Posgrado en Geografía, Facultad de Filosofía y Letras, Universidad Nacional Autónoma de México, Ciudad Universitaria, Investigación Científica, Cd. Universitaria, 04510 Ciudad de México, CDMX []
| | - Ana Raymundo-Sánchez
- Pronatura Península de Yucatán, calle 32 #269 x 47 y 47ª, Col. Pinzon II C.P. 97205, Mérida, México []
| | - Roberto Herrera-Pavon
- El Colegio de la Frontera Sur, Unidad Chetumal, Av. del Centenario Km. 5.5, C.P. 7790 Chetumal, Mexico []
| |
Collapse
|
37
|
Pfaller JB, Chaloupka M, Bolten AB, Bjorndal KA. Phylogeny, biogeography and methodology: a meta-analytic perspective on heterogeneity in adult marine turtle survival rates. Sci Rep 2018; 8:5852. [PMID: 29643352 DOI: 10.1038/s41598-018-24262-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 03/28/2018] [Indexed: 11/09/2022] Open
Abstract
Comparative syntheses of key demographic parameters are critical not only for identifying data gaps, but also for evaluating sources of heterogeneity among estimates. Because demographic studies frequently exhibit heterogeneity, evaluating sources of heterogeneity among estimates can inform biological patterns and conservation actions more broadly. To better understand adult survival in marine turtles and avoid drawing inaccurate conclusions from current estimates, we conducted a comprehensive meta-analysis to test how heterogeneity among estimates was partitioned among phylogenetic, biogeographic and methodological factors. Fifty-nine studies from five marine turtle species met the minimum selection criteria for inclusion in our meta-analysis. Heterogeneity among survival estimates was first partitioned between differences in ocean basin (Indo-Pacific versus Atlantic), then by differences among family/tribe within the Indo-Pacific (Chelonini versus Carettini and Dermochelidae). However, apparent differences attributed to biogeography (ocean basin effect) and phylogeny (family/tribe effect) were highly correlated with methodological differences in tag type, model type, habitat type and study duration, thereby confounding biological interpretations and complicating efforts to use many current survival estimates in population assessments. Our results highlight the importance of evaluating sources of heterogeneity when interpreting patterns among similar demographic studies and directly inform efforts to identify research priorities for marine turtles globally.
Collapse
|
38
|
Burgess MG, McDermott GR, Owashi B, Peavey Reeves LE, Clavelle T, Ovando D, Wallace BP, Lewison RL, Gaines SD, Costello C. Protecting marine mammals, turtles, and birds by rebuilding global fisheries. Science 2018; 359:1255-1258. [DOI: 10.1126/science.aao4248] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 01/26/2018] [Indexed: 11/02/2022]
|
39
|
|
40
|
Abstract
Declines of marine megafauna due to fisheries by-catch are thought to be mitigated by exclusion devices that release nontarget species. However, exclusion devices may instead conceal negative effects associated with by-catch caused by fisheries (i.e., unobserved or discarded by-catch with low postrelease survival or reproduction). We show that the decline of the endangered New Zealand (NZ) sea lion (Phocarctos hookeri) is linked to latent levels of by-catch occurring in sub-Antarctic trawl fisheries. Exclusion devices have been used since 2001 but have not slowed or reversed population decline. However, 35% of the variability in NZ sea lion pup production is explained by latent by-catch, and the population would increase without this factor. Our results indicate that exclusion devices can obscure rather than alleviate fishery impacts on marine megafauna.
Collapse
|
41
|
Pham CK, Rodríguez Y, Dauphin A, Carriço R, Frias JPGL, Vandeperre F, Otero V, Santos MR, Martins HR, Bolten AB, Bjorndal KA. Plastic ingestion in oceanic-stage loggerhead sea turtles (Caretta caretta) off the North Atlantic subtropical gyre. Mar Pollut Bull 2017; 121:222-229. [PMID: 28606614 DOI: 10.1016/j.marpolbul.2017.06.008] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Revised: 06/02/2017] [Accepted: 06/03/2017] [Indexed: 05/25/2023]
Abstract
Juvenile oceanic-stage sea turtles are particularly vulnerable to the increasing quantity of plastic coming into the oceans. In this study, we analysed the gastrointestinal tracts of 24 juvenile oceanic-stage loggerheads (Caretta caretta) collected off the North Atlantic subtropical gyre, in the Azores region, a key feeding ground for juvenile loggerheads. Twenty individuals were found to have ingested marine debris (83%), composed exclusively of plastic items (primarily polyethylene and polypropylene) identified by μ-Fourier Transform Infrared Spectroscopy. Large microplastics (1-5mm) represented 25% of the total number of debris and were found in 58% of the individuals sampled. Average number of items was 15.83±6.09 (±SE) per individual, corresponding to a mean dry mass of 1.07±0.41g. The results of this study demonstrate that plastic pollution acts as another stressor for this critical life stage of loggerhead turtles in the North Atlantic.
Collapse
Affiliation(s)
- Christopher K Pham
- IMAR-Institute of Marine Research and MARE-Marine and Environmental Sciences Centre, University of the Azores, Horta, Portugal.
| | - Yasmina Rodríguez
- IMAR-Institute of Marine Research and MARE-Marine and Environmental Sciences Centre, University of the Azores, Horta, Portugal
| | - Axelle Dauphin
- ENVT - École Nationale Vétérinaire de Toulouse, 23 Chemin des Capelles, 31300 Toulouse, France
| | - Rita Carriço
- IMAR-Institute of Marine Research and MARE-Marine and Environmental Sciences Centre, University of the Azores, Horta, Portugal
| | - João P G L Frias
- IMAR-Institute of Marine Research and MARE-Marine and Environmental Sciences Centre, University of the Azores, Horta, Portugal
| | - Frederic Vandeperre
- IMAR-Institute of Marine Research and MARE-Marine and Environmental Sciences Centre, University of the Azores, Horta, Portugal
| | - Vanessa Otero
- Department of Conservation and Restoration and LAQV-REQUIMTE, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829-516 Monte da Caparica, Portugal
| | - Marco R Santos
- DRAM - Direção Regional dos Assuntos do Mar/Regional Directorate for Sea Affairs, Secretaria Regional do Mar, Ciência e Tecnologia, Colónia Alemã - Apartado 9, 9900-014 Horta, Faial, Portugal
| | - Helen R Martins
- IMAR-Institute of Marine Research and MARE-Marine and Environmental Sciences Centre, University of the Azores, Horta, Portugal
| | - Alan B Bolten
- ACCSTR - Archie Carr Center for Sea Turtle Research, Department of Biology, PO Box 118525, University of Florida, Gainesville, FL, USA
| | - Karen A Bjorndal
- ACCSTR - Archie Carr Center for Sea Turtle Research, Department of Biology, PO Box 118525, University of Florida, Gainesville, FL, USA
| |
Collapse
|
42
|
Genovart M, Doak DF, Igual JM, Sponza S, Kralj J, Oro D. Varying demographic impacts of different fisheries on three Mediterranean seabird species. Glob Chang Biol 2017; 23:3012-3029. [PMID: 28231421 DOI: 10.1111/gcb.13670] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 02/01/2017] [Indexed: 06/06/2023]
Abstract
Fisheries have an enormous economic importance, but reconciling their socio-economic features with the conservation and sustainability of marine ecosystems presents major challenges. Bycatch mortality from fisheries is clearly among the most serious global threats for marine ecosystems, affecting a wide range of top predators. Recent estimates report ca. 200,000 seabirds killed annually by bycatch in European waters. However, there is an urgent need to rigorously estimate actual mortality rates and quantify effects of bycatch on populations. The Mediterranean Sea is one of the most impacted regions. Here, we estimate for the first time both bycatch mortality rates and their population-level effects on three endemic and vulnerable Mediterranean taxa: Scopoli's shearwater, Mediterranean shag, and Audouin's gull, that die in different types of fishing gears: longlines, gillnets and sport trolling, respectively. We use multi-event capture-recapture modelling to estimate crucial demographic parameters, including the probabilities of dying in different fishing gears. We then build stochastic demography models to forecast the viability of the populations under different management scenarios. Longline bycatch was particularly severe for adults of Scopoli's shearwaters and Audouin's gulls (ca. 28% and 23% of total mortality, respectively) and also for immature gulls (ca. 90% of mortality). Gillnets had a lower impact, but were still responsible for ca. 9% of juvenile mortality on shags, whereas sport trolling only slightly influenced total mortality in gulls. Bycatch mortality has high population-level impacts in all three species, with shearwaters having the highest extinction risk under current mortality rates. Different life-history traits and compensatory demographic mechanisms between the three species are probably influencing the different bycatch impact: for shearwaters, urgent conservation actions are required to ensure the viability of their populations. Results will be very useful for guiding future seabird conservation policies and moving towards an ecosystem-based approach to sustainable fisheries management.
Collapse
Affiliation(s)
- Meritxell Genovart
- Population Ecology Group, IMEDEA (CSIC-UIB), Esporles, Spain
- Environmental Studies Program, 397 UCB University of Colorado, Boulder, CO, USA
- CEAB (CSIC), Girona, Spain
| | - Daniel F Doak
- Environmental Studies Program, 397 UCB University of Colorado, Boulder, CO, USA
| | | | - Stefano Sponza
- Department of Mathematics and Geosciences, University of Trieste, Trieste, Italy
| | | | - Daniel Oro
- Population Ecology Group, IMEDEA (CSIC-UIB), Esporles, Spain
- CEAB (CSIC), Girona, Spain
| |
Collapse
|
43
|
Rees AF, Alfaro-Shigueto J, Barata PCR, Bjorndal KA, Bolten AB, Bourjea J, Broderick AC, Campbell LM, Cardona L, Carreras C, Casale P, Ceriani SA, Dutton PH, Eguchi T, Formia A, Fuentes MMPB, Fuller WJ, Girondot M, Godfrey MH, Hamann M, Hart KM, Hays GC, Hochscheid S, Kaska Y, Jensen MP, Mangel JC, Mortimer JA, Naro-Maciel E, Ng CKY, Nichols WJ, Phillott AD, Reina RD, Revuelta O, Schofield G, Seminoff JA, Shanker K, Tomás J, van de Merwe JP, Van Houtan KS, Vander Zanden HB, Wallace BP, Wedemeyer-Strombel KR, Work TM, Godley BJ. Are we working towards global research priorities for management and conservation of sea turtles? ENDANGER SPECIES RES 2016. [DOI: 10.3354/esr00801] [Citation(s) in RCA: 175] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
44
|
Casale P, Freggi D, Paduano V, Oliverio M. Biases and best approaches for assessing debris ingestion in sea turtles, with a case study in the Mediterranean. Mar Pollut Bull 2016; 110:238-249. [PMID: 27321803 DOI: 10.1016/j.marpolbul.2016.06.057] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Revised: 05/27/2016] [Accepted: 06/13/2016] [Indexed: 06/06/2023]
Abstract
In a sample of 567 loggerhead turtles (Caretta caretta) from the central Mediterranean, debris occurrence varied according to methods and turtle source, and was up to 80% in pelagic turtles. Frequencies of plastic types, size and color are also reported. These results and a critical review of 49 studies worldwide indicate that: (i) the detected occurrence of plastic (% turtles) is affected by several factors (e.g., necropsy/feces, ecological zone, type and date of finding, captivity period for feces collection), (ii) mixed dataset and opportunistic approaches provide results which are biased , not comparable, and ultimately of questionable value, (iii) only turtles assumed to have had a normal feeding behaviour at the time of capture or death should be considered, (iv) turtle foraging ecology and possible selectivity may undermine the use of turtles as indicator species for monitoring marine litter, as recently proposed for the Mediterranean.
Collapse
Affiliation(s)
- Paolo Casale
- Department of Biology and Biotechnologies "Charles Darwin", University of Rome "La Sapienza", viale dell'Università 32, 00185 Roma, Italy.
| | | | - Valentina Paduano
- Department of Biology and Biotechnologies "Charles Darwin", University of Rome "La Sapienza", viale dell'Università 32, 00185 Roma, Italy.
| | - Marco Oliverio
- Department of Biology and Biotechnologies "Charles Darwin", University of Rome "La Sapienza", viale dell'Università 32, 00185 Roma, Italy.
| |
Collapse
|
45
|
Quiñones J, García-Godos I, Llapapasca M, Ordt FV, Paredes E. The Black Sea Turtle (Chelonia mydas agassizii) at Lobos de Tierra Island, Northern Peru: High Densities in Small Areas. South American Journal of Herpetology 2015. [DOI: 10.2994/sajh-d-14-00040.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
46
|
Peckham SH, Lucero-Romero J, Maldonado-Díaz D, Rodríguez-Sánchez A, Senko J, Wojakowski M, Gaos A. Buoyless Nets Reduce Sea Turtle Bycatch in Coastal Net Fisheries. Conserv Lett 2015. [DOI: 10.1111/conl.12176] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- S. Hoyt Peckham
- Center for Ocean Solutions; Stanford University; Pacific Grove CA USA
| | - Jesus Lucero-Romero
- Grupo Tortuguero de las Californias; A.C; La Paz, Baja California Sur México
| | | | | | - Jesse Senko
- School of Life Sciences; Arizona State University; Tempe AZ USA
| | | | - Alexander Gaos
- Eastern Pacific Hawksbill Initiative; San Diego CA USA
- San Diego State University; San Diego CA USA
- University of California Davis; Davis CA USA
| |
Collapse
|
47
|
Abstract
Understanding the distribution of bycaught sea turtles could inform conservation strategies and priorities. This research analyses the distribution of turtles caught as longline fisheries bycatch on the high seas of the Atlantic Ocean. This research collected 18,142 bycatch observations and 47.1 million hooks from large-scale Taiwanese longline vessels in the Atlantic Ocean from June 2002 to December 2013. The coverage rates were ranged from 0.48% to 17.54% by year. Seven hundred and sixty-seven turtles were caught, and the major species were leatherback (59.8%), olive ridley (27.1%) and loggerhead turtles (8.7%). Most olive ridley (81.7%) and loggerhead (82.1%) turtles were hooked, while the leatherbacks were both hooked (44.0%) and entangled (31.8%). Depending on the species, 21.4% to 57.7% were dead when brought onboard. Most of the turtles were caught in tropical areas, especially in the Gulf of Guinea (15°N-10°S, 30°W-10°E), but loggerheads were caught in the south Atlantic Ocean (25°S-35°S, 40°W-10°E and 30°S-40°S, 55°W-45°W). The bycatch rate was the highest at 0.030 per 1000 hooks for leatherbacks in the tropical area. The bycatch rates of olive ridley ranged from 0 to 0.010 per thousand hooks. The loggerhead bycatch rates were higher in the northern and southern Atlantic Ocean and ranged from 0.0128 to 0.0239 per thousand hooks. Due to the characteristics of the Taiwanese deep-set longline fleet, bycatch rates were lower than those of coastal longline fisheries, but mortality rates were higher because of the long hours of operation. Gear and bait modification should be considered to reduce sea turtle bycatch and increase survival rates while reducing the use of shallow hooks would also be helpful.
Collapse
Affiliation(s)
- Hsiang-Wen Huang
- Institute of Marine Affairs and Resource Management, National Taiwan Ocean University, Keelung, Taiwan
- * E-mail:
| |
Collapse
|
48
|
Tomaszewicz CNT, Seminoff JA, Avens L, Goshe LR, Peckham SH, Rguez-Baron JM, Bickerman K, Kurle CM. Age and residency duration of loggerhead turtles at a North Pacific bycatch hotspot using skeletochronology. Biol Conserv 2015; 186:134-142. [PMID: 25848136 PMCID: PMC4384431 DOI: 10.1016/j.biocon.2015.03.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
For migratory marine animals, like sea turtles, effective conservation can be challenging because key demographic information such as duration of life stages and exposure to spatially explicit threats in different habitats are often unknown. In the eastern Pacific near the Baja California Peninsula (BCP), Mexico, tens of thousands of endangered North Pacific loggerhead sea turtles (Caretta caretta) concentrate at a foraging area known to have high rates of fishery bycatch. Because stage survivorship of loggerheads in the BCP will vary significantly depending on the number of years spent in this region, we applied skeletochronology to empirically estimate residency duration in this loggerhead hotspot. The observed age distribution obtained from skeletochronology analysis of 146 dead-stranded loggerheads ranged from three to 24 years old, suggesting a BCP residency of >20 years. Given the maximum estimated age and a one-year migration to western Pacific nesting beaches, we infer age-at-maturation for BCP loggerheads at ~25 years old. We also examine survivorship at varying BCP residency durations by applying our findings to current annual mortality estimates. Predicted survivorship of loggerheads spending over 20 years in this BCP foraging habitat is less than 10%, and given that ~43,000 loggerhead turtles forage here, a significant number of turtles are at extreme risk in this region. This is the first empirical evidence supporting estimated age-at-maturation for BCP North Pacific loggerheads, and the first estimates of BCP stage survivorship. Our findings emphasize the urgent need for continued and effective international conservation efforts to minimize bycatch of this endangered species.
Collapse
Affiliation(s)
- Calandra N. Turner Tomaszewicz
- Division of Biological Sciences, Ecology, Behavior, and Evolution Section, University of California, San Diego, La Jolla, CA 92093-0116, USA
- Southwest Fisheries Science Center, NOAA-National Marine Fisheries Service, La Jolla, California 92037, USA
- Corresponding Author: CTT, , 858-334-2842 Address: University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0116
| | - Jeffrey A. Seminoff
- Southwest Fisheries Science Center, NOAA-National Marine Fisheries Service, La Jolla, California 92037, USA
| | - Larisa Avens
- Southeast Fisheries Science Center, NOAA, National Marine Fisheries Service, Beaufort, North Carolina 28516, USA
| | - Lisa R. Goshe
- Southeast Fisheries Science Center, NOAA, National Marine Fisheries Service, Beaufort, North Carolina 28516, USA
| | - S. Hoyt Peckham
- Center for Ocean Solutions, Stanford University, Pacific Grove, California 93940, USA
| | - Juan M. Rguez-Baron
- Marine Biology Department, Universidad Autonoma de Baja California Sur., La Paz, Baja California Sur, Mexico
| | - Kalyn Bickerman
- School of Biology and Ecology, University of Maine, Orono, Maine 04469, USA
| | - Carolyn M. Kurle
- Division of Biological Sciences, Ecology, Behavior, and Evolution Section, University of California, San Diego, La Jolla, CA 92093-0116, USA
| |
Collapse
|
49
|
Warden ML, Haas HL, Rose KA, Richards PM. A spatially explicit population model of simulated fisheries impact on loggerhead sea turtles (Caretta caretta) in the Northwest Atlantic Ocean. Ecol Modell 2015. [DOI: 10.1016/j.ecolmodel.2014.11.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
50
|
|