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Sea-level driven glacial-age refugia and post-glacial mixing on subtropical coasts, a palaeohabitat and genetic study

TitleSea-level driven glacial-age refugia and post-glacial mixing on subtropical coasts, a palaeohabitat and genetic study
Publication TypeJournal Article
Year of Publication2016
AuthorsDolby G.A, Hechinger R., Ellingson R.A, Findley L.T, Lorda J., Jacobs D.K
JournalProceedings of the Royal Society B-Biological Sciences
Date Published2016/11
Type of ArticleArticle
ISBN Number0962-8452
Accession NumberWOS:000390349900006
Keywordsapproximate bayesian; approximate bayesian computation; Baja California; comparative phylogeography; computation; estuaries; eucyclogobius-newberryi teleostei; gillichthys-mirabilis; ice ages; last glacial maximum; north pacific; population-structure; Recolonization; southern california; temperature; tidewater goby

Using a novel combination of palaeohabitat modelling and genetic mixture analyses, we identify and assess a sea-level-driven recolonization process following the Last Glacial Maximum (LGM). Our palaeohabitat modelling reveals dramatic changes in estuarine habitat distribution along the coast of California (USA) and Baja California (Mexico). At the LGM (approx. 20 kya), when sea level was approximately 130 m lower, the palaeo-shoreline was too steep for tidal estuarine habitat formation, eliminating this habitat type from regions where it is currently most abundant, and limiting such estuaries to a northern and a southern refugium separated by 1000 km. We assess the recolonization of estuaries formed during post-LGM sea-level rise through examination of refugium-associated alleles and approximate Bayesian computation in three species of estuarine fishes. Results reveal sourcing of modern populations from both refugia, which admix in the newly formed habitat between the refuges. We infer a dramatic peak in habitat area between 15 and 10 kya with subsequent decline. Overall, this approach revealed a previously undocumented dynamic and integrated relationship between sea-level change, coastal processes and population genetics. These results extend glacial refugial dynamics to unglaciated subtropical coasts and have significant implications for biotic response to predicted sea-level rise.

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