Evidence for panmixia despite barriers to gene flow in the hooked mussel, Ischadium recurvum (Mytilidae; Brachidontinae) along the North American coastline
| Autor: | Megan Whitaker, Jasmine Starnes, Yvette L. Garner, Frank M. Fontanella |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Gene Flow Pleistocene Population Climate change Biology 010603 evolutionary biology 01 natural sciences DNA Mitochondrial 03 medical and health sciences Genetics Animals Glacial period Biomass education Molecular Biology education.field_of_study Panmixia Ecology Ischadium recurvum biology.organism_classification Phylogeography 030104 developmental biology Biological dispersal Mytilidae Animal Distribution |
| Zdroj: | Mitochondrial DNA. Part A, DNA mapping, sequencing, and analysis. 30(1) |
| ISSN: | 2470-1408 |
| Popis: | The discovery of phylogeographic patterns within broadly distributed marine species can be particularly challenging because absolute physical barriers to dispersal can be inconspicuous. Genetic boundaries often lie where ocean currents meet, forming sharp physical and ecological gradients, which may act as barriers to successful migrants. In eastern North America, coastal species often show phylogeographic differentiation associated with two recognized genetic barriers: the Gulf/Atlantic and the Virginia/Carolina discontinuities. We examined 185 specimens of the intertidal hooked mussel Ischadium recurvum collected from 15 locations along the eastern coastline of North America to examine phylogeographic, migration and historical demographic patterns associated climate change associated with Pleistocene glacial patterns. Hypothesis testing using Bayes factors in Migrate-n rejected the presence of phylogeographic breaks consistent with either maritime discontinuity and favoured a panmictic population model. The migration rate from the Gulf to the Atlantic was approximately three times higher than the migration from the Atlantic to the Gulf whereas the Carolina-Virginia migration rates were nearly equal. The summary statistics (Tajima's D, Fu's Fs) were significant and the demographic analyses (mismatch distributions, Bayesian skyline plot) were consistent with patterns of population expansion following glacial retreat during the Pleistocene epoch. |
| Databáze: | OpenAIRE |
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