The introduction of the rusty crayfish, Orconectes rusticus, has large effects on freshwater communities by displacing native crayfish species and altering macroinvertebrate communities. We used laboratory studies of aggression, shelter use, and feeding to examine the relationship between O. rusticus and a crayfish native to the Northeast, Orconectes limosus, along with these species' consumption of native bivalves. Orconectes rusticus dominated O. limosus in aggression trials, and shelter trials showed that dominant crayfish obtained shelter over subordinate crayfish. Both species of crayfish consumed freshwater mussels (Unionidae) and fingernail clams (Sphaeriidae), preferring prey of smaller size and those that were not buried. These findings suggest that the invasion of O. rusticus may pose a threat to native crayfish and the already threatened bivalves of the Northeast.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.