Living on the edge: how philopatry maintains adaptive potential.

Stiebens, Victor A, Merino, Sonia E, Roder, Christian, Chain, Frederic JJ, Lee, Patricia LM and Eizaguirre, Christophe 2013, Living on the edge: how philopatry maintains adaptive potential., Proceedings of the Royal Society B : biological sciences, vol. 280, no. 1763, pp. 1-9, doi: 10.1098/rspb.2013.0305.

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Title Living on the edge: how philopatry maintains adaptive potential.
Author(s) Stiebens, Victor A
Merino, Sonia E
Roder, Christian
Chain, Frederic JJ
Lee, Patricia LMORCID iD for Lee, Patricia LM
Eizaguirre, Christophe
Journal name Proceedings of the Royal Society B : biological sciences
Volume number 280
Issue number 1763
Start page 1
End page 9
Total pages 9
Publisher Royal Society Publishing
Place of publication London, England
Publication date 2013-05-29
ISSN 0962-8452
Keyword(s) philopatry
local adaptation,
mitochondrial DNA
major histocompatibility complex
loggerhead sea turtle (Caretta caretta)
Summary Without genetic variation, species cannot cope with changing environments, and evolution does not proceed. In endangered species, adaptive potential may be eroded by decreased population sizes and processes that further reduce gene flow such as philopatry and local adaptations. Here, we focused on the philopatric and endangered loggerhead sea turtle (Caretta caretta) nesting in Cape Verde as a model system to investigate the link between adaptive potential and philopatry. We produced a dataset of three complementary genomic regions to investigate female philopatric behaviour (mitochondrial DNA), male-mediated gene flow (microsatellites) and adaptive potential (major histocompatibility complex, MHC). Results revealed genetically distinct nesting colonies, indicating remarkably small-scale philopatric behaviour of females. Furthermore, these colonies also harboured local pools of MHC alleles, especially at the margins of the population's distribution, which are therefore important reserves of additional diversity for the population. Meanwhile, directional male-mediated gene flow from the margins of distribution sustains the adaptive potential for the entire rookery. We therefore present the first evidence for a positive association between philopatry and locally adapted genomic regions. Contrary to expectation, we propose that philopatry conserves a high adaptive potential at the margins of a distribution, while asymmetric gene flow maintains genetic connectivity with the rest of the population.
Language eng
DOI 10.1098/rspb.2013.0305
Field of Research 070499 Fisheries Sciences not elsewhere classified
060411 Population, Ecological and Evolutionary Genetics
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
Socio Economic Objective 960808 Marine Flora, Fauna and Biodiversity
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2013, Royal Society Publishing
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