Weak phylogeographic structure in the endemic western North American fairy shrimp <Emphasis Type="Italic">Branchinecta lynchi</Emphasis> (Eng,Belk and Erickson 1990) |
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| Authors: | Email author" target="_blank">Andres?AguilarEmail author |
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| Institution: | (1) School of Natural Sciences and Sierra Nevada Research Institute, University of California, Merced, 5200 North Lake Road, Merced, CA 95344, USA |
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| Abstract: | The vernal pool fairy shrimp (Branchinecta lynchi) (Eng et al. in J Crustac Biol 10:247–277, 1990) is broadly distributed throughout California’s Central Valley with disjunct populations in southern California and southern
Oregon. A survey of genetic variation at the mitochondrial cytochrome c oxidase subunit I (COI) gene was conducted from individuals
collected throughout the range of the species. Phylogenetic analysis of unique haplotypes could not resolve any significant
genetic partitions below the species level. A detailed analysis of samples from two pools indicates that sample sizes underestimate
overall variation, but that the general phylogeographic pattern still holds. Evidence was found for a putative long-distance
dispersal event between Central Valley sites and the Oregon site. These results indicate that geographically limiting stochastic
colonization followed by local diversification may be important in governing current genetic structure for this species. Future
and current conservation/restoration efforts should recognize the geographic limitations to population structure for this
species and focus on local endemic genetic variation. |
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