Determinants of genetic variation across eco-evolutionary scales in pinnipeds
| Autor: | David Aurioles-Gamboa, Saurabh D. Pophaly, Larissa Rosa de Oliveira, Kit M. Kovacs, Claire R. Peart, Chi-Chih Wu, Aaron B. A. Shafer, Mervi Kunnasranta, Christian Lydersen, Simona Sanvito, Joseph I. Hoffman, Neil J. Gemmell, Mia Valtonen, Tommi Nyman, Jaume Forcada, Sergio Tusso, John W. Bickham, Jochen B. W. Wolf, Amy B. Baird, Filippo Galimberti, Fidel Botero-Castro, Anthony J. Orr |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine Demographic history Population Biology 010603 evolutionary biology 01 natural sciences Coalescent theory Population genomics 03 medical and health sciences Effective population size Genetic variation Animals education Ecology Evolution Behavior and Systematics Population Density education.field_of_study Genome Ecology Population size Genetic Variation Biological Evolution Caniformia 030104 developmental biology Demographic change |
| Zdroj: | Nature ecologyevolution. 4(8) |
| ISSN: | 2397-334X |
| Popis: | The effective size of a population (Ne), which determines its level of neutral variability, is a key evolutionary parameter. Ne can substantially depart from census sizes of present-day breeding populations (NC) as a result of past demographic changes, variation in life-history traits and selection at linked sites. Using genome-wide data we estimated the long-term coalescent Ne for 17 pinniped species represented by 36 population samples (total n = 458 individuals). Ne estimates ranged from 8,936 to 91,178, were highly consistent within (sub)species and showed a strong positive correlation with NC ( $${R}_{\mathrm{adj}}^2$$ = 0.59; P = 0.0002). Ne/NC ratios were low (mean, 0.31; median, 0.13) and co-varied strongly with demographic history and, to a lesser degree, with species’ ecological and life-history variables such as breeding habitat. Residual variation in Ne/NC, after controlling for past demographic fluctuations, contained information about recent population size changes during the Anthropocene. Specifically, species of conservation concern typically had positive residuals indicative of a smaller contemporary NC than would be expected from their long-term Ne. This study highlights the value of comparative population genomic analyses for gauging the evolutionary processes governing genetic variation in natural populations, and provides a framework for identifying populations deserving closer conservation attention. Using comparative population genomics across pinnipeds, this study explores how demographic change and life-history traits are correlated to the effective size of a population and conservation status. |
| Databáze: | OpenAIRE |
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