Geography best explains global patterns of genetic diversity and postglacial co-expansion in marine turtles

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Reid, Brendan N
Naro-Maciel, Eugenia
Hahn, Anelise Torres
FitzSimmons, Nancy N
Gehara, Marcelo
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2019
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Abstract

For many species, climate oscillations drove cycles of population contraction during cool glacial periods followed by expansion during interglacials. Some groups, however, show evidence of uniform and synchronous expansion, while others display differences in the timing and extent of demographic change. We compared demographic histories inferred from genetic data across marine turtle species to identify responses to postglacial warming shared across taxa and to examine drivers of past demographic change at the global scale. Using coalescent simulations and approximate Bayesian computation (ABC), we estimated demographic parameters, including the likelihood of past population expansion, from a mitochondrial data set encompassing 23 previously identified lineages from all seven marine turtle species. For lineages with a high posterior probability of expansion, we conducted a hierarchical ABC analysis to estimate the proportion of lineages expanding synchronously and the timing of synchronous expansion. We used Bayesian model averaging to identify variables associated with expansion and genetic diversity. Approximately 60% of extant marine turtle lineages showed evidence of expansion, with the rest mainly exhibiting patterns of genetic diversity most consistent with population stability. For lineages showing expansion, there was a strong signal of synchronous expansion after the Last Glacial Maximum. Expansion and genetic diversity were best explained by ocean basin and the degree of endemism for a given lineage. Geographic differences in sensitivity to climate change have implications for prioritizing conservation actions in marine turtles as well as for identifying areas of past demographic stability and potential resilience to future climate change for broadly distributed taxa.

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Molecular Ecology

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28

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14

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© 20109 John Wiley & Sons Ltd. This is the peer reviewed version of the following article: Geography best explains global patterns of genetic diversity and postglacial co‐expansion in marine turtles, Molecular Ecology, Volume 28, Issue 14, July 2019, Pages 3358-3370, which has been published in final form at 10.1111/mec.15165. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-828039.html)

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Biological sciences

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Life Sciences & Biomedicine

Biochemistry & Molecular Biology

Ecology

Evolutionary Biology

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Reid, BN; Naro-Maciel, E; Hahn, AT; FitzSimmons, NN; Gehara, M, Geography best explains global patterns of genetic diversity and postglacial co-expansion in marine turtles, Molecular Ecology, 2019, 28 (14), pp. 3358-3370

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