Measures of effective population size in sea otters reveal special considerations for wide‐ranging species Article Swipe
Roderick B. Gagne
,
M. Timothy Tinker
,
Kyle D. Gustafson
,
Katherine Ralls
,
Shawn Larson
,
L. Max Tarjan
,
Melissa A. Miller
,
Holly B. Ernest
·
YOU?
·
· 2018
· Open Access
·
· DOI: https://doi.org/10.1111/eva.12642
YOU?
·
· 2018
· Open Access
·
· DOI: https://doi.org/10.1111/eva.12642
Conservation genetic techniques and considerations of the evolutionary potential of a species are increasingly being applied to species conservation. For example, effective population size ( N e ) estimates are useful for determining the conservation status of species, yet accurate estimates of current N e remain difficult to obtain. The effective population size can contribute to setting federal delisting criteria, as was done for the southern sea otter ( Enhydra lutris nereis ). After being hunted to near extinction during the North Pacific fur trade, the southern sea otter has recovered over part of its former range, but remains at relatively low numbers, making it desirable to obtain accurate and consistent estimates of N e . Although theoretical papers have compared the validity of several methods, comparisons of estimators using empirical data in applied conservation settings are limited. We combined thirteen years of demographic and genetic data from 1,006 sea otters to assess multiple N e estimators, as well as temporal trends in genetic diversity and population genetic structure. Genetic diversity was low and did not increase over time. There was no evidence for distinct genetic units, but some evidence for genetic isolation by distance. In particular, estimates of N e based on demographic data were much larger than genetic estimates when computed for the entire range of the population, but were similar at smaller spatial scales. The discrepancy between estimates at large spatial scales could be driven by cryptic population structure and/or individual differences in reproductive success. We recommend the development of new delisting criteria for the southern sea otter. We advise the use of multiple estimates of N e for other wide‐ranging species, species with overlapping generations, or with sex‐biased dispersal, as well as the development of improved metrics of genetic assessments of populations.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1111/eva.12642
- https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/eva.12642
- OA Status
- gold
- Cited By
- 28
- References
- 83
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W2799690182
All OpenAlex metadata
Raw OpenAlex JSON
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https://openalex.org/W2799690182Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1111/eva.12642Digital Object Identifier
- Title
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Measures of effective population size in sea otters reveal special considerations for wide‐ranging speciesWork title
- Type
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articleOpenAlex work type
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enPrimary language
- Publication year
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2018Year of publication
- Publication date
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2018-04-30Full publication date if available
- Authors
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Roderick B. Gagne, M. Timothy Tinker, Kyle D. Gustafson, Katherine Ralls, Shawn Larson, L. Max Tarjan, Melissa A. Miller, Holly B. ErnestList of authors in order
- Landing page
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https://doi.org/10.1111/eva.12642Publisher landing page
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https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/eva.12642Direct link to full text PDF
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YesWhether a free full text is available
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goldOpen access status per OpenAlex
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https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/eva.12642Direct OA link when available
- Concepts
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Biology, Ecology, Population, Population size, Fishery, Demography, SociologyTop concepts (fields/topics) attached by OpenAlex
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28Total citation count in OpenAlex
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2025: 5, 2024: 1, 2023: 1, 2022: 6, 2021: 5Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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