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A comprehensive evaluation of three mussel beds in Reach 15 of the Upper Mississippi River


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Unionid mussels were collected by quadrat sampling at three mussel beds in Reach 15 of the Upper Mississippi River (UMR) between July 1994 and September 1995. A total of 7,107 unionids were collected representing 26 species, including the federally endangered Lampsilis higginsi, state endangered Plethobasus cyphyus and Cumberlandia monodonta, and state threatened Ellipsaria lineolata. Mean densities at our study sites ranged from 53.4 to 118.3 mussels/m2. Comparisons with data collected at these same sites in the early 1980s revealed significant declines in unionid abundance, sporadic recruitment, and extremely slow growth rates. Height-frequency histograms for commercially harvested species remain truncated at the legal harvest size [...]



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  • Upper Midwest Environmental Sciences Center (UMESC)



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Illinois Natural History Survey Aquatic Ecology Technical Report 1996(7), Havana. Reprinted by U.S. Geological Survey, Environmental Management Technical Center, Onalaska, Wisconsin

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