alexa Evaluating How Chela Size Influences the Invasion Potential of an Introduced Crayfish (Orconectes rusticus)
Agri and Aquaculture

Agri and Aquaculture

Fisheries and Aquaculture Journal

Author(s): James E Garvey

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In northern Wisconsin lakes, the crayfish Orconectes rusticus is replacing O. propinquus, a previous invader, and O. virilis, a native crayfish. Because chela size dictates success in aggressive encounters, predatory defense and reproduction, interspecific size differences could lend insight to this ongoing replacement. To quantify chela size differences among these three species, we measured chela lengths and widths of Form II (FII, nonreproductive) males, Form I (FI, reproductive) males and females. For FI and FII males, both O. rusticus and O. propinquus had larger chelae than similar-sized O. virilis. Females differed only slightly in chela size. Females had smaller chelae than their male conspecifics. Chela size differences, coupled with differential body size, likely contributes, via differential predatory susceptibility and reproductive success, to the replacement of O. propinquus and O. virilis by O. rusticus.

This article was published in The American Midland Naturalist and referenced in Fisheries and Aquaculture Journal

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