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26 July 2011 Haplotype variation in the spiny-cheek crayfish Orconectes limosus: colonization of Europe and genetic diversity of native stocks
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Abstract

The North American spiny-cheek crayfish, Orconectes limosus (Rafinesque, 1817), a widespread invader in Europe, seems to have been introduced there successfully only once. According to available literature, 90 individuals of unclear origin were released in Poland in 1890. Despite this apparent bottleneck, the species has successfully colonized various aquatic habitats and has displaced native crayfish species in many places. To test whether different European populations were likely to have come from a single source and to identify their possible origin, we analyzed the diversity of the mitochondrial gene for cytochrome c oxidase subunit I (COI) of O. limosus individuals from Europe and from its original range in North America, including the presumed source region of European populations, the Delaware River watershed (eastern USA). Two haplotypes were found in European populations. One haplotype was widespread; the other was present in a single population. In contrast, 18 haplotypes were detected in North America. This result supports the hypothesis of a single overseas introduction of O. limosus and suggests that the high invasion success of this species was not limited by an introduction bottleneck. Two divergent clades were detected in North American O. limosus populations. One, which includes the dominant haplotype in Europe, was found in a large part of the species' present range. The 2nd (diverging by >1%) was mostly restricted to a limited area in southeastern Pennsylvania. Orconectes limosus populations in the northern part of the species' North American range, at least some of which are nonindigenous themselves, may share the source area with European O. limosus. The endangered status of O. limosus populations in southeastern Pennsylvania and northeastern Maryland, where much of the species' genetic diversity resides, should be considered in conservation management.

The North American Benthological Society
Lenka Filipová, David A. Lieb, Frédéric Grandjean, and Adam Petrusek "Haplotype variation in the spiny-cheek crayfish Orconectes limosus: colonization of Europe and genetic diversity of native stocks," Journal of the North American Benthological Society 30(4), 871-881, (26 July 2011). https://doi.org/10.1899/10-130.1
Received: 28 September 2010; Accepted: 1 June 2011; Published: 26 July 2011
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