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Zhang M, Tang C, Zhang Q, Zhan C, Chen C, Wang Y. Selective extinction and habitat nestedness are the main drivers of lizard nestedness in the Zhoushan Archipelago. Curr Zool 2024; 70:244-252. [PMID: 38726249 PMCID: PMC11078039 DOI: 10.1093/cz/zoac103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 12/21/2022] [Indexed: 05/12/2024] Open
Abstract
Nested subset pattern (nestedness) is an important part of the theoretical framework of island biogeography and community ecology. However, most previous studies often used nestedness metrics or randomization algorithms that are vulnerable to type I error. In this study, we investigated the nestedness of lizard assemblages on 37 islands in the Zhoushan Archipelago, China. We used the line-transect method to survey species occurrence, abundance, and habitat types of lizards on 37 islands during 2 breeding seasons in 2021 and 2022. We applied the nested metric WNODF and the conservative rc null model to control for type I error and quantify the significance of nestedness. Spearman rank correlations were used to evaluate the role of 4 habitat variables (island area, 2 isolation indices, and habitat diversity) and 4 ecological traits (body size, geographic range size, clutch size, and minimum area requirement) in generating nestedness. The results of WNODF analyses showed that lizard assemblages were significantly nested. The habitat-by-site matrix estimated by the program NODF was also significantly nested, supporting the habitat nestedness hypothesis. The nestedness of lizard assemblages were significantly correlated with island area, habitat diversity, clutch size, and minimum area requirement. Overall, our results suggest that selective extinction and habitat nestedness were the main drivers of lizard nestedness in our system. In contrast, the nestedness of lizard assemblages was not due to passive sampling or selective colonization. To maximize the number of species preserved, our results indicate that we should protect both large islands with diverse habitats and species with large area requirement and clutch size.
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Affiliation(s)
- Minchu Zhang
- Laboratory of Island Biogeography and Conservation Biology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Chaonan Tang
- Laboratory of Island Biogeography and Conservation Biology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Qing Zhang
- Laboratory of Island Biogeography and Conservation Biology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Chengxiu Zhan
- Laboratory of Island Biogeography and Conservation Biology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Chuanwu Chen
- Laboratory of Island Biogeography and Conservation Biology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Yanping Wang
- Laboratory of Island Biogeography and Conservation Biology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
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Li D, Zhang F, Luo G, Zhang T, Lv J, Wang W, Yang J, You D, Xu N, Guo S, Yu J. Taxon-dependent effects of dispersal limitation versus environmental filters on bryophyte assemblages-Multiple perspective studies in land-bridge islands. Ecol Evol 2023; 13:e9844. [PMID: 36844668 PMCID: PMC9951200 DOI: 10.1002/ece3.9844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 01/25/2023] [Accepted: 02/03/2023] [Indexed: 02/28/2023] Open
Abstract
To explore the taxon-dependent contribution of dispersal limitation versus environmental filters to bryophyte assemblages. We investigated bryophytes and six environmental variables on 168 islands in the Thousand Island Lake,China. We compared the observed beta diversity with the expected values based on six null models (EE, EF, FE, FF, PE, and PF), detected the partial correlation of beta diversity with geographical distances. We quantified the contributions of spatial versus environmental variables and island isolation per se to species composition (SC) using variance partitioning. We modeled the species-area relationships (SARs) for bryophytes and the other eight biotas. To explore the taxon-dependent effects of spatial versus environmental filters on bryophytes, 16 taxa including five categories (total bryophytes, total mosses, liverworts, acrocarpous, and pleurocarpous mosses) and 11 species-richest families were included in the analyses. The observed beta diversity values were significantly different from the predicted values for all 16 taxa. For all five categories, the observed partial correlations between beta diversity and geographical distance after controlling environmental effects were not only positive, but also significantly different from the predicted values based on the null models. Spatial eigenvectors are more important in shaping SC than environmental variables for all 16 taxa except Brachytheciaceae and Anomodontaceae. Spatial eigenvectors contributed more to SC variation in liverworts than in mosses and in pleurocarpous mosses than in acrocarpous mosses. The effects of island isolation on SC were significant for all five categories, highly varied at the family level. The z values of the SARs for the five bryophyte categories were all larger than those of the other eight biotas. In subtropical fragmented forests, dispersal limitation exerted significant, taxon-dependent effects on bryophyte assemblages. It was dispersal limitation rather than environmental filtering that predominantly regulated the SC patterns of bryophytes.
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Affiliation(s)
- Dandan Li
- College of Life SciencesShanghai Normal UniversityShanghaiChina
| | - Feng Zhang
- College of Life SciencesShanghai Normal UniversityShanghaiChina
| | - Guangyu Luo
- College of Life SciencesShanghai Normal UniversityShanghaiChina
| | - Ting Zhang
- College of Life SciencesShanghai Normal UniversityShanghaiChina
| | - Jinqiao Lv
- College of Life SciencesShanghai Normal UniversityShanghaiChina
| | - Wenchao Wang
- College of Life SciencesShanghai Normal UniversityShanghaiChina
| | - Jun Yang
- College of Life SciencesShanghai Normal UniversityShanghaiChina
| | - Dejun You
- College of Life SciencesShanghai Normal UniversityShanghaiChina
| | - Nanlong Xu
- College of Life SciencesShanghai Normal UniversityShanghaiChina
| | - Shuiliang Guo
- College of Life SciencesShanghai Normal UniversityShanghaiChina
| | - Jing Yu
- College of Life SciencesShanghai Normal UniversityShanghaiChina
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A Comparative Study of Genetic Responses to Short- and Long-Term Habitat Fragmentation in a Distylous Herb Hedyotis chyrsotricha (Rubiaceae). PLANTS 2022; 11:plants11141800. [PMID: 35890434 PMCID: PMC9323511 DOI: 10.3390/plants11141800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 07/03/2022] [Accepted: 07/05/2022] [Indexed: 11/17/2022]
Abstract
The genetic effects of habitat fragmentation are complex and are influenced by both species traits and landscape features. For plants with strong seed or pollen dispersal capabilities, the question of whether the genetic erosion of an isolated population becomes stronger or is counterbalanced by sufficient gene flow across landscapes as the timescales of fragmentation increase has been less studied. In this study, we compared the population structure and genetic diversity of a distylous herb, Hedyotis chyrsotricha (Rubiaceae), in two contrasting island systems of southeast China. Based on RAD-Seq data, our results showed that populations from the artificially created Thousand-Island Lake (TIL) harbored significantly higher levels of genetic diversity than those from the Holocene-dated Zhoushan Archipelago (ZA) (π = 0.247 vs. 0.208, HO = 0.307 vs. 0.256, HE = 0.228 vs. 0.190), while genetic differences between island and mainland populations were significant in neither the TIL region nor the ZA region. A certain level of population substructure was found in TIL populations, and the level of gene flow among TIL populations was also lower than in ZA populations (m = 0.019 vs. 0.027). Overall, our comparative study revealed that genetic erosion has not become much stronger for the island populations of either the TIL or ZA regions. Our results emphasized that the matrix of water in the island system may facilitate the seed (fruit) dispersal of H. chrysotricha, thus maintaining population connectivity and providing ongoing resilience to the effects of habitat fragmentation over thousands of years.
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Ecological traits and landscape characteristics predicting bird sensitivity to urbanization in city parks. Basic Appl Ecol 2022. [DOI: 10.1016/j.baae.2021.12.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Hu G, Wilson M, Zhou BB, Shang C, Yu M, Wu J. Spatiotemporal patterns and ecological consequences of a fragmented landscape created by damming. PeerJ 2021; 9:e11416. [PMID: 34055485 PMCID: PMC8142928 DOI: 10.7717/peerj.11416] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 04/16/2021] [Indexed: 11/20/2022] Open
Abstract
Background Damming disrupts rivers and destroys neighboring terrestrial ecosystems through inundation, resulting in profound and long-lasting impacts on biodiversity and ecosystem processes far beyond the river system itself. Archipelagos formed by damming are often considered ideal systems for studying habitat fragmentation. Methods Here we quantified the island attributes and landscape dynamics of the Thousand Island Lake (TIL) in China, which is one of the several long-term biodiversity/fragmentation research sites around the world. We also synthesized the major findings of relevant studies conducted in the region to further ecological understanding of damming and landscape fragmentation. Results Our results show that the vegetations on islands and the neighboring mainland were both recovering between 1985 and 2005 due to reforestation and natural succession, but the regeneration was partly interrupted after 2005 because of increasing human influences. While major changes in landscape composition occurred primarily in the lakefront areas and near-lakeshore islands, landscape patterns became structurally more complex and fragmented on both islands and mainland. About 80 studies from the TIL region show that the genetic, taxonomic, functional, and phylogenetic diversity on these islands were mainly influenced by island area at the patch scale, but fragmentation per se also affected species composition and related ecological processes at patch and landscape scales. In general, islands had lower species diversity but a steeper species-area relationship than the surrounding mainland. Fragmentation and edge effects substantially hindered ecological succession towards more densely vegetated forests on the islands. Environmental heterogeneity and filtering had a major impact on island biotic communities. We hypothesize that there are multiple mechanisms operating at different spatial scales that link landscape fragmentation and ecological dynamics in the TIL region, which beg for future studies. By focusing on an extensive spatiotemporal analysis of the island-mainland system and a synthesis of existing studies in the region, this study provides an important foundation and several promising directions for future studies.
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Affiliation(s)
- Guang Hu
- School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, China
| | - Maxwell Wilson
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States
| | - Bing-Bing Zhou
- School of Sustainability, Arizona State University, Tempe, Arizona, United States
| | - Chenwei Shang
- School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing, China.,Center for Human-Environment System Sustainability (CHESS), Beijing Normal University, Beijing, China
| | - Mingjian Yu
- College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Jianguo Wu
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States.,School of Sustainability, Arizona State University, Tempe, Arizona, United States
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6
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Sustainability assessment of a lizard assemblage in Pernambuco state, Brazil. J Nat Conserv 2021. [DOI: 10.1016/j.jnc.2021.125957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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7
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The small-island effect and nestedness in assemblages of medium- and large-bodied mammals on Chinese reservoir land-bridge islands. Basic Appl Ecol 2019. [DOI: 10.1016/j.baae.2019.06.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Chen C, Chen C, Wang Y. Ecological correlates of extinction risk in Chinese amphibians. DIVERS DISTRIB 2019. [DOI: 10.1111/ddi.12961] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Affiliation(s)
- Chuanwu Chen
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences Nanjing Normal University Nanjing China
| | | | - Yanping Wang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences Nanjing Normal University Nanjing China
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9
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Zungu MM, Maseko MST, Kalle R, Ramesh T, Downs CT. Fragment and life-history correlates of extinction vulnerability of forest mammals in an urban-forest mosaic in EThekwini Municipality, Durban, South Africa. Anim Conserv 2018. [DOI: 10.1111/acv.12470] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- M. M. Zungu
- School of Life Sciences; University of KwaZulu-Natal; Scottsville Pietermaritzburg South Africa
| | - M. S. T. Maseko
- School of Life Sciences; University of KwaZulu-Natal; Scottsville Pietermaritzburg South Africa
| | - R. Kalle
- School of Life Sciences; University of KwaZulu-Natal; Scottsville Pietermaritzburg South Africa
- Sálim Ali Centre for Ornithology and Natural History; Coimbatore Tamil Nadu India
| | - T. Ramesh
- School of Life Sciences; University of KwaZulu-Natal; Scottsville Pietermaritzburg South Africa
- Sálim Ali Centre for Ornithology and Natural History; Coimbatore Tamil Nadu India
| | - C. T. Downs
- School of Life Sciences; University of KwaZulu-Natal; Scottsville Pietermaritzburg South Africa
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10
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Wang Y, Wang X, Wu Q, Chen C, Xu A, Ding P. The small-island effect in amphibian assemblages on subtropical land-bridge islands of an inundated lake. Curr Zool 2018; 64:303-309. [PMID: 30402071 PMCID: PMC6007631 DOI: 10.1093/cz/zox038] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 05/22/2017] [Indexed: 11/12/2022] Open
Abstract
The small-island effect (SIE) has become more and more part of the theoretical framework of island biogeography and biodiversity research. However, previous methods for the detection of SIEs are often flawed in one way or another, including not accounting for model complexity, not comparing all relevant models, and not including islands with no species. Therefore, the existence and the prevalence of the SIE may be dubious. In this study, after controlling for all these methodological shortcomings, we tested for the existence of the SIE in amphibian assemblages on subtropical land-bridge islands created by the inundation of the Thousand Island Lake, China. We used the line transect method to determine the distribution of amphibian assemblages on 23 study islands during 3 breeding seasons from 2009 to 2011. To evaluate whether an SIE exists in amphibian assemblages, we compared the fit of a simple linearized power model with two most widely used breakpoint regression models. The information-theoretic multimodel inference approach based on Akaike's information criterion identified the left-horizontal SIE model as the best single model. Thus, we found strong evidence for the existence of an SIE in our system. The upper limit of the SIE for amphibian assemblages was 39.95 ha. Below this threshold area, amphibian richness varied independently of island size. The SIE in amphibian assemblages may be due to episodic disturbances, stochastic events, and nutrient subsidies from the lake. Our results indicate that all the islands >39.95 ha should be protected for the effective conservation of amphibian assemblages in our system.
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Affiliation(s)
- Yanping Wang
- College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xi Wang
- College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Qiang Wu
- College of Life Sciences, Zhejiang University, Hangzhou 310058, China
- Station d'Ecologie Théorique et Expérimentale du CNRS, UMR5321, Moulis 09200, France
- Université de Toulouse III Paul Sabatier, Bât 4R1, 31062 Toulouse Cedex 9, France
| | - Cangsong Chen
- Zhejiang Museum of Natural History, Hangzhou, 310014, China
| | - Aichun Xu
- College of Life Sciences, China Jiliang University, Hangzhou 301118, China
| | - Ping Ding
- College of Life Sciences, Zhejiang University, Hangzhou 310058, China
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11
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Bueno AS, Dantas SM, Henriques LMP, Peres CA. Ecological traits modulate bird species responses to forest fragmentation in an Amazonian anthropogenic archipelago. DIVERS DISTRIB 2018. [DOI: 10.1111/ddi.12689] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- Anderson Saldanha Bueno
- School of Environmental Sciences; University of East Anglia; Norwich Norfolk United Kingdom
- Instituto Federal de Educação; Ciência e Tecnologia Farroupilha; Júlio de Castilhos Brazil
| | | | | | - Carlos A. Peres
- School of Environmental Sciences; University of East Anglia; Norwich Norfolk United Kingdom
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12
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Hugueny B. Age-area scaling of extinction debt within isolated terrestrial vertebrate assemblages. Ecol Lett 2017; 20:591-598. [PMID: 28299875 DOI: 10.1111/ele.12756] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 01/02/2017] [Accepted: 02/07/2017] [Indexed: 11/29/2022]
Abstract
A new model of delayed species loss (extinction debt) within isolated communities is applied to a large data set of terrestrial vertebrate assemblages (n = 188) occupying habitat fragments or islands varying greatly in size and age. The model encapsulates previous approaches based on diversity-dependent (DD) extinction rates while allowing for a more flexible treatment of temporal dynamics. Three important results emerge. First, species loss rate slows down with the age of the isolate, a strong and general pattern largely unnoticed so far. Secondly, while being good candidates in the light of previous works, DD models fail to account for this pattern, a result that necessitates a search for other mechanisms. Thirdly, a simple diversity-independent model based on area (converted into population size) and age explains 97% of the variability in species loss rate and appears to be a promising predictive tool to handle extinction debt following habitat loss.
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Affiliation(s)
- Bernard Hugueny
- UMR BOREA, MNHN, IRD 207, CNRS 7208, UPMC, Muséum National d'Histoire Naturelle, 43 rue Cuvier, FR-75231, Paris Cedex, France
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13
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Halley JM, Monokrousos N, Mazaris AD, Newmark WD, Vokou D. Dynamics of extinction debt across five taxonomic groups. Nat Commun 2016; 7:12283. [PMID: 27452815 PMCID: PMC4962471 DOI: 10.1038/ncomms12283] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2015] [Accepted: 06/20/2016] [Indexed: 11/16/2022] Open
Abstract
Species extinction following habitat loss is well documented. However, these extinctions do not happen immediately. The biodiversity surplus (extinction debt) declines with some delay through the process of relaxation. Estimating the time constants of relaxation, mainly the expected time to first extinction and the commonly used time for half the extinction debt to be paid off (half-life), is crucial for conservation purposes. Currently, there is no agreement on the rate of relaxation and the factors that it depends on. Here we find that half-life increases with area for all groups examined in a large meta-analysis of extinction data. A common pattern emerges if we use average number of individuals per species before habitat loss as an area index: for mammals, birds, reptiles and plants, the relationship has an exponent close to a half. We also find that the time to first determined extinction is short and increases slowly with area.
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Affiliation(s)
- John M. Halley
- Department of Biological Applications and Technology, Faculty of Health Sciences, University of Ioannina, 45110 Ioannina, Greece
| | - Nikolaos Monokrousos
- Department of Biological Applications and Technology, Faculty of Health Sciences, University of Ioannina, 45110 Ioannina, Greece
| | - Antonios D. Mazaris
- Department of Ecology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - William D. Newmark
- Natural History Museum of Utah, 301 Wakara Way, University of Utah, Salt Lake City, Utah 84108, USA
| | - Despoina Vokou
- Department of Ecology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
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14
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Small-island effect in snake communities on islands of an inundated lake: The need to include zeroes. Basic Appl Ecol 2015. [DOI: 10.1016/j.baae.2014.10.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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15
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A comparative study on genetic effects of artificial and natural habitat fragmentation on Loropetalum chinense (Hamamelidaceae) in Southeast China. Heredity (Edinb) 2014; 114:544-51. [PMID: 25515015 DOI: 10.1038/hdy.2014.114] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 11/06/2014] [Accepted: 11/10/2014] [Indexed: 11/08/2022] Open
Abstract
Elucidating the demographic and landscape features that determine the genetic effects of habitat fragmentation has become fundamental to research in conservation and evolutionary biology. Land-bridge islands provide ideal study areas for investigating the genetic effects of habitat fragmentation at different temporal and spatial scales. In this context, we compared patterns of nuclear microsatellite variation between insular populations of a shrub of evergreen broad-leaved forest, Loropetalum chinense, from the artificially created Thousand-Island Lake (TIL) and the Holocene-dated Zhoushan Archipelago of Southeast China. Populations from the TIL region harboured higher levels of genetic diversity than those from the Zhoushan Archipelago, but these differences were not significant. There was no correlation between genetic diversity and most island features, excepting a negative effect of mainland-island distance on allelic richness and expected heterozygosity in the Zhoushan Archipelago. In general, levels of gene flow among island populations were moderate to high, and tests of alternative models of population history strongly favoured a gene flow-drift model over a pure drift model in each region. In sum, our results showed no obvious genetic effects of habitat fragmentation due to recent (artificial) or past (natural) island formation. Rather, they highlight the importance of gene flow (most likely via seed) in maintaining genetic variation and preventing inter-population differentiation in the face of habitat 'insularization' at different temporal and spatial scales.
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Low reproductive rate predicts species sensitivity to habitat loss: a meta-analysis of wetland vertebrates. PLoS One 2014; 9:e90926. [PMID: 24651675 PMCID: PMC3961235 DOI: 10.1371/journal.pone.0090926] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Accepted: 02/07/2014] [Indexed: 11/23/2022] Open
Abstract
We tested the hypotheses that species with greater mobility and/or higher reproductive rates are less sensitive to habitat loss than species with lower mobility and/or reproductive rates by conducting a meta-analysis of wetland vertebrate responses to wetland habitat loss. We combined data from 90 studies conducted worldwide that quantified the relationship between wetland amount in a landscape and population abundance of at least one wetland species to determine if mobility (indexed as home range size and body length) and annual reproductive rate influence species responses to wetland loss. When analyzed across all taxa, animals with higher reproductive rates were less sensitive to wetland loss. Surprisingly, we did not find an effect of mobility on response to wetland loss. Overall, wetland mammals and birds were more sensitive to wetland loss than were reptiles and amphibians. Our results suggest that dispersal between habitat patches is less important than species’ reproductive rates for population persistence in fragmented landscapes. This implies that immigration and colonization rate is most strongly related to reproduction, which determines the total number of potential colonists.
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18
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Liu J, Bao Y, Wang Y, Sun B, Ye B. Effects of islanding on the genetics ofNiviventer confucianus(Mamalia: Rodentia: Muridae) populations in the Thousand Island Lake region. J NAT HIST 2013. [DOI: 10.1080/00222933.2013.773098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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19
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Betzholtz PE, Franzén M. Ecological characteristics associated with high mobility in night-active moths. Basic Appl Ecol 2013. [DOI: 10.1016/j.baae.2013.01.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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20
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Yuan N, Comes HP, Mao YR, Qi XS, Qiu YX. Genetic effects of recent habitat fragmentation in the Thousand-Island Lake region of southeast China on the distylous herb Hedyotis chrysotricha (Rubiaceae). AMERICAN JOURNAL OF BOTANY 2012; 99:1715-25. [PMID: 23024122 DOI: 10.3732/ajb.1200054] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
PREMISE OF THE STUDY Known-age artificial-lake islands provide ideal model systems to elucidate the genetic and evolutionary consequences of anthropogenic habitat fragmentation on very recent time scales. Here, we studied a distylous herb, Hedyotis chrysotricha (Rubiaceae), in the artificially created Thousand-Island Lake (TIL) region of southeast China to explore the genetic consequences of islanding for this species. • METHODS Seven microsatellite loci were used to genotype 384 individuals of H. chrysotricha from 18 populations to estimate genetic diversity, population structure, and demographic parameters. • KEY RESULTS Island populations had significantly lower mean genetic diversity than those from the western/eastern mainland (e.g., H(E) = 0.381 vs. 0.461) and also displayed higher mean subdivision (F(ST) = 0.12 vs. 0.042/0.051). BayesAss analyses indicated moderate levels of migration rates among most populations, whereas Bottleneck did not provide strong evidence for such effects. In consequence, 2MOD strongly favored a gene flow-drift model over a pure drift model in the study area, but concomitantly revealed a relatively greater influence of drift in the island populations as evidenced by their significantly higher probabilities of allelic coancestry (F = 0.184 vs. 0.085). • CONCLUSIONS The observed genetic patterns in H. chrysotricha indicate that recent anthropogenic habitat fragmentation in the TIL region can lead to significant loss of genetic diversity in isolated fragments (islands) due to ongoing drift. By contrast, patterns of random mating, gene flow, and population connectivity have not greatly been modified yet, possibly owing to the species' fruit (seed) dispersal capabilities providing resilience in the face of habitat fragmentation.
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Affiliation(s)
- Na Yuan
- Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, and College of Life Sciences, Zhejiang University, Hangzhou 310058, China
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Wang X, Wang YP, Ding P. [Nested species subsets of amphibians and reptiles in Thousand Island Lake]. DONG WU XUE YAN JIU = ZOOLOGICAL RESEARCH 2012; 33:439-46. [PMID: 23019024 DOI: 10.3724/sp.j.1141.2012.05439] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Habitat fragmentation is a main cause for the loss of biological diversity. Combining line-transect methods to survey the amphibians and reptiles on 23 islands on Thousand Island Lake in Zhejiang province, along with survey data on nearby plant species and habitat variables collected by GIS, we used the"BINMATNEST (binary matrix nestedness temperature calculator)" software and the Spearman rank correlation to examine whether amphibians and reptiles followed nested subsets and their influencing factors. The results showed that amphibians and reptiles were significantly nested, and that the island area and habitat type were significantly associated with their nested ranks. Therefore, to effectively protect amphibians and reptiles in the Thousand Islands Lake area we should pay prior attention to islands with larger areas and more habitat types.
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Affiliation(s)
- Xi Wang
- College of Life Sciences, Zhejiang University, Hangzhou 310058, China
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Knapp CR, Perez-Heydrich C. Using non-conspicuous metrics to examine selected impacts of disturbance on a long-lived reptile. ENDANGER SPECIES RES 2012. [DOI: 10.3354/esr00424] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Wang Y, Zhang M, Wang S, Ding Z, Zhang J, Sun J, Li P, Ding P. No evidence for the small-island effect in avian communities on islands of an inundated lake. OIKOS 2012. [DOI: 10.1111/j.1600-0706.2012.20322.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Yuan N, Sun Y, Nakamura K, Qiu YX. Development of microsatellite markers in heterostylous Hedyotis chrysotricha (Rubiaceae). AMERICAN JOURNAL OF BOTANY 2012; 99:e43-e45. [PMID: 22275766 DOI: 10.3732/ajb.1100304] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
PREMISE OF THE STUDY Microsatellite primers were developed for a heterostylous herb, Hedyotis chrysotricha to investigate the effect of habitat fragmentation on its genetic diversity and population structure. METHODS AND RESULTS Twelve primer sets were developed and their polymorphisms were tested on 47 individuals from two island populations of H. chrysotricha in Thousand Island Lake of China. The number of alleles per locus ranged from five to 10, with an average of seven alleles. Expected heterozygosity per locus ranged from 0.284 to 0.821 and observed heterozygosity ranged from 0.191 to 0.851. CONCLUSIONS We showed that all of the 12 microsatellite markers developed for H. chrysotricha are polymorphic within populations, which should provide a powerful tool for assessing population structure and genetic diversity across fragmented and continuous populations, and for studying the genetic effects of habitat fragmentation on this species.
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Affiliation(s)
- Na Yuan
- Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
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Effects of habitat fragmentation on avian nest predation risk in Thou-sand Island Lake, Zhejiang Province. ACTA ACUST UNITED AC 2011. [DOI: 10.3724/sp.j.1003.2011.07036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Relative importance of quantity, quality and isolation of patches for butterfly diversity in fragmented urban forests. Ecol Res 2011. [DOI: 10.1007/s11284-011-0896-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Thornton D, Branch L, Sunquist M. Passive sampling effects and landscape location alter associations between species traits and response to fragmentation. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2011; 21:817-829. [PMID: 21639047 DOI: 10.1890/10-0549.1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
As tropical reserves become smaller and more isolated, the ability of species to utilize fragmented landscapes will be a key determinant of species survival. Although several ecological and life history traits commonly are associated with vulnerability to fragmentation, the combination of traits that are most highly influential and the effectiveness of those traits in predicting vulnerability across distinct landscapes, remains poorly understood. We studied use of forest fragments by 25 mid- and large-sized neotropical mammals in Guatemala to determine how seven species traits influence vulnerability to fragmentation. We measured vulnerability in two ways: one measure that did not remove passive sampling effects (proportion of fragments occupied), and one that did (difference in occupancy rates within continuous and fragmented sites). We also examined the influence of species traits on patch occupancy rates of the same set of mammals on two landscapes in Mexico. When not accounting for passive sampling effects, body size, home range size, and vulnerability to hunting influenced how species responded to fragmentation. However, after controlling for passive sampling effects, only vulnerability to hunting strongly influenced sensitivity to fragmentation. Species that were heavily hunted were much less common in forest patches than in continuous forest sites of the same sampling size. The cross-landscape comparison revealed both similarities and differences in the species traits that influenced patch occupancy patterns on each landscape. Given the ubiquity of hunting in tropical environments, our findings indicate that management efforts in fragmented landscapes that do not account for hunting pressure may be ineffective in conserving heavily hunted tropical species. Our study also indicates that species traits may be useful in predicting relative patch occupancy rates and/or vulnerability to fragmentation across distinct landscapes, but that caution must be used as certain traits can become more or less influential on different landscapes, even when considering the same set of species.
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Affiliation(s)
- Daniel Thornton
- University of Florida, Department of Wildlife Ecology and Conservation, 110 Newins-Zieglar Hall, Gainesville, Florida 32611-0430, USA.
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Wang Y, Bao Y, Yu M, Xu G, Ding P. BIODIVERSITY RESEARCH: Nestedness for different reasons: the distributions of birds, lizards and small mammals on islands of an inundated lake. DIVERS DISTRIB 2010. [DOI: 10.1111/j.1472-4642.2010.00682.x] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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