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- Title
Phylogeography and trans-Pacific divergence of the rocky shore gastropod Nucella lima.
- Authors
Nicole Cox, L.; Zaslavskaya, Nadezhda I.; Marko, Peter B.; Rocha, Luiz
- Abstract
Aim We have used phylogeographical and multilocus coalescent population genetic methods to reconstruct the Pleistocene biogeographical history of a broadly distributed north Pacific rocky shore gastropod, Nucella lima. Location Northern Pacific rim, from south-eastern Alaska to Hokkaido Island. Methods We gathered DNA sequence data from three loci from N. lima, whose current distribution spans the entire North Pacific rim. We used a combination of population genetic summary statistics ( Tajima's D, Fu's F S and Φ ST), isolation-with-migration divergence models, and extended Bayesian skyline plots to reconstruct the recent biogeographical history of this species. Results The largest values of Φ ST across all loci were always between eastern and western samples. Population divergence models indicated no gene flow and mid- Pleistocene divergence times (> 600 ka) between eastern and western populations. Mitochondrial DNA diversity in the east was low, and coalescent-based estimates of effective population size were significantly smaller in the east 20,000 years ago, at the end of the last glacial period. Main conclusions The results are consistent with a hypothesis in which north Pacific populations were separated into eastern and western refugia by 317 ka with no gene flow since the split. Eastern populations probably underwent a severe bottleneck in population size during the last glacial period. The contrasting demographic histories of eastern and western populations are consistent with the general palaeobiogeographical pattern of greater climate-related extinction of marine taxa in the eastern Pacific.
- Subjects
PACIFIC Ocean; PHYLOGEOGRAPHY; LIMA (Mollusks); GASTROPODA; POPULATION genetics; PLEISTOCENE Epoch; CLIMATE change
- Publication
Journal of Biogeography, 2014, Vol 41, Issue 3, p615
- ISSN
0305-0270
- Publication type
Article
- DOI
10.1111/jbi.12217