Killer whale genomes reveal a complex history of recurrent admixture and vicariance
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Killer whale genomes reveal a complex history of recurrent admixture and vicariance. / Foote, Andrew D.; Martin, Michael D.; Louis, Marie; Pacheco, George; Robertson, Kelly M; Sinding, Mikkel-Holger S; Amaral, Ana R; Baird, Robin W.; Baker, Charles Scott; Ballance, Lisa; Barlow, Jay; Brownlow, Andrew; Collins, Tim; Constantine, Rochelle; Dabin, Willy; Dalla Rosa, Luciano; Davison, Nicholas J; Durban, John W; Esteban, Ruth; Ferguson, Steven H.; Gerrodette, Tim; Guinet, Christophe; Hanson, M. Bradley; Hoggard, Wayne; Matthews, Cory J D; Samarra, Filipa I. P.; de Stephanis, Renaud; Tavares, Sara B; Tixier, Paul; Totterdell, John A; Wade, Paul; Excoffier, Laurent; Gilbert, M Thomas P; Wolf, Jochen B. W.; Morin, Phillip A.
In: Molecular Ecology, Vol. 28, No. 14, 2019, p. 3427-3444.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Killer whale genomes reveal a complex history of recurrent admixture and vicariance
AU - Foote, Andrew D.
AU - Martin, Michael D.
AU - Louis, Marie
AU - Pacheco, George
AU - Robertson, Kelly M
AU - Sinding, Mikkel-Holger S
AU - Amaral, Ana R
AU - Baird, Robin W.
AU - Baker, Charles Scott
AU - Ballance, Lisa
AU - Barlow, Jay
AU - Brownlow, Andrew
AU - Collins, Tim
AU - Constantine, Rochelle
AU - Dabin, Willy
AU - Dalla Rosa, Luciano
AU - Davison, Nicholas J
AU - Durban, John W
AU - Esteban, Ruth
AU - Ferguson, Steven H.
AU - Gerrodette, Tim
AU - Guinet, Christophe
AU - Hanson, M. Bradley
AU - Hoggard, Wayne
AU - Matthews, Cory J D
AU - Samarra, Filipa I. P.
AU - de Stephanis, Renaud
AU - Tavares, Sara B
AU - Tixier, Paul
AU - Totterdell, John A
AU - Wade, Paul
AU - Excoffier, Laurent
AU - Gilbert, M Thomas P
AU - Wolf, Jochen B. W.
AU - Morin, Phillip A.
N1 - © 2019 John Wiley & Sons Ltd.
PY - 2019
Y1 - 2019
N2 - Reconstruction of the demographic and evolutionary history of populations assuming a consensus tree-like relationship can mask more complex scenarios, which are prevalent in nature. An emerging genomic toolset, which has been most comprehensively harnessed in the reconstruction of human evolutionary history, enables molecular ecologists to elucidate complex population histories. Killer whales have limited extrinsic barriers to dispersal and have radiated globally, and are therefore a good candidate model for the application of such tools. Here, we analyse a global data set of killer whale genomes in a rare attempt to elucidate global population structure in a nonhuman species. We identify a pattern of genetic homogenisation at lower latitudes and the greatest differentiation at high latitudes, even between currently sympatric lineages. The processes underlying the major axis of structure include high drift at the edge of species' range, likely associated with founder effects and allelic surfing during postglacial range expansion. Divergence between Antarctic and non-Antarctic lineages is further driven by ancestry segments with up to four-fold older coalescence time than the genome-wide average; relicts of a previous vicariance during an earlier glacial cycle. Our study further underpins that episodic gene flow is ubiquitous in natural populations, and can occur across great distances and after substantial periods of isolation between populations. Thus, understanding the evolutionary history of a species requires comprehensive geographic sampling and genome-wide data to sample the variation in ancestry within individuals.
AB - Reconstruction of the demographic and evolutionary history of populations assuming a consensus tree-like relationship can mask more complex scenarios, which are prevalent in nature. An emerging genomic toolset, which has been most comprehensively harnessed in the reconstruction of human evolutionary history, enables molecular ecologists to elucidate complex population histories. Killer whales have limited extrinsic barriers to dispersal and have radiated globally, and are therefore a good candidate model for the application of such tools. Here, we analyse a global data set of killer whale genomes in a rare attempt to elucidate global population structure in a nonhuman species. We identify a pattern of genetic homogenisation at lower latitudes and the greatest differentiation at high latitudes, even between currently sympatric lineages. The processes underlying the major axis of structure include high drift at the edge of species' range, likely associated with founder effects and allelic surfing during postglacial range expansion. Divergence between Antarctic and non-Antarctic lineages is further driven by ancestry segments with up to four-fold older coalescence time than the genome-wide average; relicts of a previous vicariance during an earlier glacial cycle. Our study further underpins that episodic gene flow is ubiquitous in natural populations, and can occur across great distances and after substantial periods of isolation between populations. Thus, understanding the evolutionary history of a species requires comprehensive geographic sampling and genome-wide data to sample the variation in ancestry within individuals.
U2 - 10.1111/mec.15099
DO - 10.1111/mec.15099
M3 - Journal article
C2 - 31131963
VL - 28
SP - 3427
EP - 3444
JO - Molecular Ecology
JF - Molecular Ecology
SN - 0962-1083
IS - 14
ER -
ID: 227690852