Geography best explains global patterns of genetic diversity and postglacial co‐expansion in marine turtles
| Autor: | Eugenia Naro-Maciel, Brendan N. Reid, Anelise Torres Hahn, Nancy N. FitzSimmons, Marcelo Gehara |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine Internationality Population Climate change 010603 evolutionary biology 01 natural sciences Coalescent theory 03 medical and health sciences Quantitative Trait Heritable Genetics Animals Ice Cover Seawater Glacial period Endemism education Phylogeny Ecology Evolution Behavior and Systematics Probability Genetic diversity education.field_of_study Geography Ecology Genetic Variation Bayes Theorem Turtles 030104 developmental biology Demographic change Approximate Bayesian computation |
| Zdroj: | Molecular Ecology. 28:3358-3370 |
| ISSN: | 1365-294X 0962-1083 |
| DOI: | 10.1111/mec.15165 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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