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Comparative population genomics reveals key barriers to dispersal in Southern Ocean penguins

Comparative population genomics reveals key barriers to dispersal in Southern Ocean penguins
Comparative population genomics reveals key barriers to dispersal in Southern Ocean penguins

The mechanisms that determine patterns of species dispersal are important factors in the production and maintenance of biodiversity. Understanding these mechanisms helps to forecast the responses of species to environmental change. Here, we used a comparative framework and genomewide data obtained through RAD-Seq to compare the patterns of connectivity among breeding colonies for five penguin species with shared ancestry, overlapping distributions and differing ecological niches, allowing an examination of the intrinsic and extrinsic barriers governing dispersal patterns. Our findings show that at-sea range and oceanography underlie patterns of dispersal in these penguins. The pelagic niche of emperor (Aptenodytes forsteri), king (A. patagonicus), Adélie (Pygoscelis adeliae) and chinstrap (P. antarctica) penguins facilitates gene flow over thousands of kilometres. In contrast, the coastal niche of gentoo penguins (P. papua) limits dispersal, resulting in population divergences. Oceanographic fronts also act as dispersal barriers to some extent. We recommend that forecasts of extinction risk incorporate dispersal and that management units are defined by at-sea range and oceanography in species lacking genetic data.

Aptenodytes, genetic differentiation, Polar Front, population genomics, Pygoscelis, RAD-Seq
0962-1083
4680-4697
Clucas, Gemma V.
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Younger, Jane L.
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Kao, Damian
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Emmerson, Louise
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Southwell, Colin
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Wienecke, Barbara
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Rogers, Alex D.
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Bost, Charles André
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Miller, Gary D.
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Polito, Michael J.
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Lelliott, Patrick
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Handley, Jonathan
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Crofts, Sarah
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Phillips, Richard A.
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Dunn, Michael J.
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Miller, Karen J.
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Hart, Tom
de3eadf1-5833-4bdd-ba26-c608ed0eb206
Clucas, Gemma V.
01c99eb2-5dbb-4f55-847c-1283065b40e1
Younger, Jane L.
deea6329-2600-4dfa-a47e-8ac1dd2010e1
Kao, Damian
56c3666c-222c-4d19-98b3-958d3fecc0bd
Emmerson, Louise
5fcafa57-96df-45a5-b775-fca9aa3103df
Southwell, Colin
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Wienecke, Barbara
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Rogers, Alex D.
fb474198-f059-48f7-b637-74617b5023f6
Bost, Charles André
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Miller, Gary D.
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Polito, Michael J.
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Lelliott, Patrick
5145cfc6-da86-4ad4-b344-5f14c6782ebd
Handley, Jonathan
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Crofts, Sarah
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Phillips, Richard A.
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Dunn, Michael J.
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Miller, Karen J.
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Hart, Tom
de3eadf1-5833-4bdd-ba26-c608ed0eb206

Clucas, Gemma V., Younger, Jane L., Kao, Damian, Emmerson, Louise, Southwell, Colin, Wienecke, Barbara, Rogers, Alex D., Bost, Charles André, Miller, Gary D., Polito, Michael J., Lelliott, Patrick, Handley, Jonathan, Crofts, Sarah, Phillips, Richard A., Dunn, Michael J., Miller, Karen J. and Hart, Tom (2018) Comparative population genomics reveals key barriers to dispersal in Southern Ocean penguins. Molecular Ecology, 27 (23), 4680-4697. (doi:10.1111/mec.14896).

Record type: Article

Abstract

The mechanisms that determine patterns of species dispersal are important factors in the production and maintenance of biodiversity. Understanding these mechanisms helps to forecast the responses of species to environmental change. Here, we used a comparative framework and genomewide data obtained through RAD-Seq to compare the patterns of connectivity among breeding colonies for five penguin species with shared ancestry, overlapping distributions and differing ecological niches, allowing an examination of the intrinsic and extrinsic barriers governing dispersal patterns. Our findings show that at-sea range and oceanography underlie patterns of dispersal in these penguins. The pelagic niche of emperor (Aptenodytes forsteri), king (A. patagonicus), Adélie (Pygoscelis adeliae) and chinstrap (P. antarctica) penguins facilitates gene flow over thousands of kilometres. In contrast, the coastal niche of gentoo penguins (P. papua) limits dispersal, resulting in population divergences. Oceanographic fronts also act as dispersal barriers to some extent. We recommend that forecasts of extinction risk incorporate dispersal and that management units are defined by at-sea range and oceanography in species lacking genetic data.

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More information

Accepted/In Press date: 24 September 2018
e-pub ahead of print date: 11 October 2018
Published date: 1 December 2018
Keywords: Aptenodytes, genetic differentiation, Polar Front, population genomics, Pygoscelis, RAD-Seq

Identifiers

Local EPrints ID: 427273
URI: http://eprints.soton.ac.uk/id/eprint/427273
ISSN: 0962-1083
PURE UUID: c6236002-541a-494b-a36b-c4db86b4d3f9
ORCID for Gemma V. Clucas: ORCID iD orcid.org/0000-0002-4305-1719

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Date deposited: 10 Jan 2019 17:30
Last modified: 09 Jan 2022 09:27

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Contributors

Author: Gemma V. Clucas ORCID iD
Author: Jane L. Younger
Author: Damian Kao
Author: Louise Emmerson
Author: Colin Southwell
Author: Barbara Wienecke
Author: Alex D. Rogers
Author: Charles André Bost
Author: Gary D. Miller
Author: Michael J. Polito
Author: Patrick Lelliott
Author: Jonathan Handley
Author: Sarah Crofts
Author: Richard A. Phillips
Author: Michael J. Dunn
Author: Karen J. Miller
Author: Tom Hart

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