THE UNIONID MOLLUSKS OF THE BIG AND LITTLE NEMAHA RIVER BASINS OF SOUTHEASTERN NEBRASKA AND NORTHEASTERN KANSAS

摘要

A qualitative survey of the unionid mollusks of the Nemaha basins resulted in the recovery of twenty-seven taxa and the confirmation of one additional taxon through museum records. The channelization of the basins, combined with siltation and possibly the impacts of various pollutants, have severely impacted the bivalve fauna of the region, eliminating of as many as 61 percent of the documented unionid taxa of the basins.