Metapopulation connectivity retains genetic diversity following a historical bottleneck in a federally endangered seabird
Abstract Despite intensive management since the 1970s, recovery of the endangered northwestern Atlantic population of the Roseate Tern (Sterna dougallii dougallii) has not offset low productivity from a female-biased sex ratio, low adult survival, and habitat constriction. Now, >90% of indivi...
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Online Access: | http://dx.doi.org/10.1093/ornithapp/duab037 http://academic.oup.com/condor/article-pdf/123/4/duab037/40979247/duab037.pdf |
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croxfordunivpr:10.1093/ornithapp/duab037 2024-09-15T18:26:24+00:00 Metapopulation connectivity retains genetic diversity following a historical bottleneck in a federally endangered seabird Dayton, Jacob Szczys, Patricia ECSU-AAUP Jean H. Thoresen Marc Freeman Summer Research Waterbird Society Nisbet Research 2021 http://dx.doi.org/10.1093/ornithapp/duab037 http://academic.oup.com/condor/article-pdf/123/4/duab037/40979247/duab037.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Ornithological Applications volume 123, issue 4 ISSN 0010-5422 2732-4621 journal-article 2021 croxfordunivpr https://doi.org/10.1093/ornithapp/duab037 2024-08-27T04:16:27Z Abstract Despite intensive management since the 1970s, recovery of the endangered northwestern Atlantic population of the Roseate Tern (Sterna dougallii dougallii) has not offset low productivity from a female-biased sex ratio, low adult survival, and habitat constriction. Now, >90% of individuals breed at three sites within 200 km from Long Island, NY, to Buzzards Bay, MA (warm-water subregion). To characterize the impact of historical bottlenecks, metapopulation structure, and demographic fluctuations on genetic variation, Roseate Terns from the warm-water (1870s, 1970s, 1997, 2016) and cold-water (Nova Scotia, Canada; 2018) subregions were genotyped at 8–16 microsatellites and 2–3 mitochondrial regions. Diversity declined in the warm-water subregion from the 1870s (expected heterozygosity [HE] = 0.44, allelic richness [AR] = 2.86) and 1970s (HE = 0.53, AR = 3.25) to 1997 (HE = 0.38, AR = 2.58). Genetic signatures of bottlenecks persisted in 1997 (P = <0.001–0.003) and 2016 (P = <0.001–0.005), but an increase in variation occurred by 2016 (HE = 0.50, AR = 2.85). Weak structure was detected between contemporary warm- and cold-water subregions (θ = 0.06) and within the warm-water subregion (θ = 0.04). Both demographic (3,439–3,821) and genetic (3,040) estimates suggested effective population size (Ne) stability over the last 100 years, despite large fluctuations in census size (4,000–8,662). Results suggest that 50 years of management (restoring habitat, preventing gull encroachment, controlling predators) at colony sites supported a small, stable Ne and maintained a hierarchical metapopulation that allowed gene flow to redistribute genetic variation throughout the northwest Atlantic. The metapopulation remains highly vulnerable to stochastic events but harbors resiliency and redundancy through gene flow and a stable Ne. For long-term persistence from a genetic perspective, managers must maintain the major source colonies, increase the availability of high-quality peripheral breeding sites, ... Article in Journal/Newspaper Northwest Atlantic Oxford University Press Ornithological Applications 123 4 |
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Oxford University Press |
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croxfordunivpr |
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English |
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Abstract Despite intensive management since the 1970s, recovery of the endangered northwestern Atlantic population of the Roseate Tern (Sterna dougallii dougallii) has not offset low productivity from a female-biased sex ratio, low adult survival, and habitat constriction. Now, >90% of individuals breed at three sites within 200 km from Long Island, NY, to Buzzards Bay, MA (warm-water subregion). To characterize the impact of historical bottlenecks, metapopulation structure, and demographic fluctuations on genetic variation, Roseate Terns from the warm-water (1870s, 1970s, 1997, 2016) and cold-water (Nova Scotia, Canada; 2018) subregions were genotyped at 8–16 microsatellites and 2–3 mitochondrial regions. Diversity declined in the warm-water subregion from the 1870s (expected heterozygosity [HE] = 0.44, allelic richness [AR] = 2.86) and 1970s (HE = 0.53, AR = 3.25) to 1997 (HE = 0.38, AR = 2.58). Genetic signatures of bottlenecks persisted in 1997 (P = <0.001–0.003) and 2016 (P = <0.001–0.005), but an increase in variation occurred by 2016 (HE = 0.50, AR = 2.85). Weak structure was detected between contemporary warm- and cold-water subregions (θ = 0.06) and within the warm-water subregion (θ = 0.04). Both demographic (3,439–3,821) and genetic (3,040) estimates suggested effective population size (Ne) stability over the last 100 years, despite large fluctuations in census size (4,000–8,662). Results suggest that 50 years of management (restoring habitat, preventing gull encroachment, controlling predators) at colony sites supported a small, stable Ne and maintained a hierarchical metapopulation that allowed gene flow to redistribute genetic variation throughout the northwest Atlantic. The metapopulation remains highly vulnerable to stochastic events but harbors resiliency and redundancy through gene flow and a stable Ne. For long-term persistence from a genetic perspective, managers must maintain the major source colonies, increase the availability of high-quality peripheral breeding sites, ... |
author2 |
ECSU-AAUP Jean H. Thoresen Marc Freeman Summer Research Waterbird Society Nisbet Research |
format |
Article in Journal/Newspaper |
author |
Dayton, Jacob Szczys, Patricia |
spellingShingle |
Dayton, Jacob Szczys, Patricia Metapopulation connectivity retains genetic diversity following a historical bottleneck in a federally endangered seabird |
author_facet |
Dayton, Jacob Szczys, Patricia |
author_sort |
Dayton, Jacob |
title |
Metapopulation connectivity retains genetic diversity following a historical bottleneck in a federally endangered seabird |
title_short |
Metapopulation connectivity retains genetic diversity following a historical bottleneck in a federally endangered seabird |
title_full |
Metapopulation connectivity retains genetic diversity following a historical bottleneck in a federally endangered seabird |
title_fullStr |
Metapopulation connectivity retains genetic diversity following a historical bottleneck in a federally endangered seabird |
title_full_unstemmed |
Metapopulation connectivity retains genetic diversity following a historical bottleneck in a federally endangered seabird |
title_sort |
metapopulation connectivity retains genetic diversity following a historical bottleneck in a federally endangered seabird |
publisher |
Oxford University Press (OUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1093/ornithapp/duab037 http://academic.oup.com/condor/article-pdf/123/4/duab037/40979247/duab037.pdf |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Ornithological Applications volume 123, issue 4 ISSN 0010-5422 2732-4621 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/ornithapp/duab037 |
container_title |
Ornithological Applications |
container_volume |
123 |
container_issue |
4 |
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1810466883403513856 |