Phylogenomics of the killer whale indicates ecotype divergence in sympatry
Phylogenomics of the killer whale indicates ecotype divergence in sympatry
For many highly mobile species, the marine environment presents few obvious barriers to gene flow. Even so, there is considerable diversity within and among species, referred to by some as the 'marine speciation paradox'. The recent and diverse radiation of delphinid cetaceans (dolphins) represents a good example of this. Delphinids are capable of extensive dispersion and yet many show fine-scale genetic differentiation among populations. Proposed mechanisms include the division and isolation of populations based on habitat dependence and resource specializations, and habitat release or changing dispersal corridors during glacial cycles. Here we use a phylogenomic approach to investigate the origin of differentiated sympatric populations of killer whales (Orcinus orca). Killer whales show strong specialization on prey choice in populations of stable matrifocal social groups (ecotypes), associated with genetic and phenotypic differentiation. Our data suggest evolution in sympatry among populations of resource specialists.
48-55
Moura, A. E.
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Kenny, J. G.
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Chaudhuri, R. R.
43513d7c-0168-4f11-b188-f3d2f0e596cb
Hughes, M. A.
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Reisinger, R. R.
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De Bruyn, P. J.N.
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Dahlheim, M. E.
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Hall, N.
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Hoelzel, A. R.
b911b554-8bee-4c68-9cf4-62214d803e7f
1 January 2015
Moura, A. E.
665db41b-726d-457f-b525-496540b1bf2a
Kenny, J. G.
d5c887a9-2bb7-417a-a35b-39bfebfbf4d4
Chaudhuri, R. R.
43513d7c-0168-4f11-b188-f3d2f0e596cb
Hughes, M. A.
2306bfa8-7474-43ee-bf89-01bb035889bb
Reisinger, R. R.
4eaf9440-48e5-41fa-853f-d46457e5444e
De Bruyn, P. J.N.
4239fc92-c272-4bad-a8ca-c5edf24fa933
Dahlheim, M. E.
ff064450-a0d9-4f0b-85c7-8501a54d0b72
Hall, N.
4afad989-5ef7-498e-a0bc-110d33d6daae
Hoelzel, A. R.
b911b554-8bee-4c68-9cf4-62214d803e7f
Moura, A. E., Kenny, J. G., Chaudhuri, R. R., Hughes, M. A., Reisinger, R. R., De Bruyn, P. J.N., Dahlheim, M. E., Hall, N. and Hoelzel, A. R.
(2015)
Phylogenomics of the killer whale indicates ecotype divergence in sympatry.
Heredity, 114 (1), .
(doi:10.1038/hdy.2014.67).
Abstract
For many highly mobile species, the marine environment presents few obvious barriers to gene flow. Even so, there is considerable diversity within and among species, referred to by some as the 'marine speciation paradox'. The recent and diverse radiation of delphinid cetaceans (dolphins) represents a good example of this. Delphinids are capable of extensive dispersion and yet many show fine-scale genetic differentiation among populations. Proposed mechanisms include the division and isolation of populations based on habitat dependence and resource specializations, and habitat release or changing dispersal corridors during glacial cycles. Here we use a phylogenomic approach to investigate the origin of differentiated sympatric populations of killer whales (Orcinus orca). Killer whales show strong specialization on prey choice in populations of stable matrifocal social groups (ecotypes), associated with genetic and phenotypic differentiation. Our data suggest evolution in sympatry among populations of resource specialists.
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More information
Accepted/In Press date: 30 May 2014
e-pub ahead of print date: 23 July 2014
Published date: 1 January 2015
Additional Information:
Funding Information:
We thank Howard Gray for providing primer sequences for the amplification of mitochondrial DNA, and Charlene Janse van Rensburg and Colin Nicholson for labwork associated with DNA extraction and archiving. This study was funded by the Natural Environment Research Council UK (grant number NE/014443/1). We thank the South African Department of Environmental Affairs for providing logistical support within the South African National Antarctic Programme and the Department of Science and Technology (administered through the South African National Research Foundation) for funding the marine mammal monitoring programme at Marion Island.
Publisher Copyright:
© 2015 Macmillan Publishers Limited All rights reserved.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
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Local EPrints ID: 455010
URI: http://eprints.soton.ac.uk/id/eprint/455010
ISSN: 0018-067X
PURE UUID: 577a5096-71ec-4869-941b-715c2bf85f50
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Date deposited: 03 Mar 2022 17:46
Last modified: 18 Mar 2024 04:03
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Contributors
Author:
A. E. Moura
Author:
J. G. Kenny
Author:
R. R. Chaudhuri
Author:
M. A. Hughes
Author:
P. J.N. De Bruyn
Author:
M. E. Dahlheim
Author:
N. Hall
Author:
A. R. Hoelzel
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