TY - JOUR
T1 - Determinants of genetic variation across eco-evolutionary scales in pinnipeds
AU - Peart, Claire R.
AU - Tusso, Sergio
AU - Pophaly, Saurabh D.
AU - Botero-Castro, Fidel
AU - Wu, Chi Chih
AU - Aurioles-Gamboa, David
AU - Baird, Amy B.
AU - Bickham, John W.
AU - Forcada, Jaume
AU - Galimberti, Filippo
AU - Gemmell, Neil J.
AU - Hoffman, Joseph I.
AU - Kovacs, Kit M.
AU - Kunnasranta, Mervi
AU - Lydersen, Christian
AU - Nyman, Tommi
AU - de Oliveira, Larissa Rosa
AU - Orr, Anthony J.
AU - Sanvito, Simona
AU - Valtonen, Mia
AU - Shafer, Aaron B.A.
AU - Wolf, Jochen B.W.
N1 - Publisher Copyright:
© 2020, The Author(s), under exclusive licence to Springer Nature Limited.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - 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 (Radj2 = 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.
AB - 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 (Radj2 = 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.
UR - http://www.scopus.com/inward/record.url?scp=85086175984&partnerID=8YFLogxK
U2 - 10.1038/s41559-020-1215-5
DO - 10.1038/s41559-020-1215-5
M3 - Artículo
C2 - 32514167
AN - SCOPUS:85086175984
SN - 2397-334X
VL - 4
SP - 1095
EP - 1104
JO - Nature Ecology and Evolution
JF - Nature Ecology and Evolution
IS - 8
ER -