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| European green crabs (Carcinus maenas) in the northeastern Pacific: Genetic evidence for high population connectivity and current-mediated expansion from a single introduced source population Tepolt, C.K.; Darling, J.A.; Bagley, M.J.; Geller, J.B.; Blum, M.J.; Grosholz, E.D. (2009). European green crabs (Carcinus maenas) in the northeastern Pacific: Genetic evidence for high population connectivity and current-mediated expansion from a single introduced source population. Diversity Distrib. 15(6): 997-1009. https://dx.doi.org/10.1111/j.1472-4642.2009.00605.x
In: Diversity and Distributions. Blackwell: Oxford. ISSN 1366-9516; e-ISSN 1472-4642
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Canada, British Columbia Fauna > Aquatic organisms > Aquatic animals > Shellfish > Marine organisms > Marine crustaceans Genetic diversity INE, USA, California, San Francisco Bay INE, USA, Oregon INE, USA, Washington Life history Migrant species Population characteristics > Population number Population characteristics > Population structure Spreading Taxa > Species > Introduced species Carcinus maenas (Linnaeus, 1758) [WoRMS]; Crustacea [WoRMS]; Decapoda [WoRMS] British Columbia [Marine Regions]; Oregon [Marine Regions]; San Francisco Bay [Marine Regions]; Washington [Marine Regions] Marien/Kust |
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Location The central west coast of North America, encompassing California, Oregon, and Washington (USA) and British Columbia (Canada). Methods We collected 1040 total samples from 21 sites representing the major episodes of population establishment and expansion along the west coast of North America. Microsatellite markers were used to assess genetic diversity and structure at different time points in the species’ spread, to investigate connectivity between embayments and to estimate both short-term effective population sizes and the number of original founders. Assignment testing was performed to determine the likely source of the introduction. Results Carcinus maenas in western North America likely derived from a single introduction of a small number of founders to San Francisco Bay, CA from the east coast of North America. Throughout its western North American range, the species experiences periodic migration between embayments, resulting in a minor loss of genetic diversity in more recently established populations versus the populations in the area of initial establishment. Main conclusions Low genetic diversity has not precluded the ability of C. maenas to successfully establish and spread on the west coast of North America. An efficient oceanographic transport mechanism combined with highly conducive life history traits are likely the major drivers of C. maenas spread. Evidence for a single introduction underscores the potential utility of early detection and eradication of high-risk invasive species. |
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