Freshwater mussel (Bivalvia : Unionidae) survey of the Galena River basin, Wisconsin and Illinois

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I investigated the freshwater mussel assemblage of the Galena River basin in Wisconsin and Illinois in 2005-2006 to determine distribution and structure of the fauna. I collected 27 live individuals representing 5 species during 47 person-hours of sampling at 28 sites; I also found valves of an additional 20 species, including 5 species listed at the state level in Wisconsin and/or Illinois. Freshwater mussels were evident at 18, or 64%, of the sites. Regression analysis indicated an increase in extant species richness (r(2) = 0.21 1 F-0.05(2),F- 26 = 6.97, P = 0.02) and historic species richness (r(2) = 0,58, F-0.05(2),F- (26) = 40.18, P 0.0001) from upstream to downstream. Expanding drainage areas usually offer decreased gradients, more habitat complexities, and higher host fish diversity. A t-test concluded extant and historic species richness differed significantly (t(0.05(1),17) = 3.56, P = 0.003) suggesting that the assemblage has been reduced.
Original languageEnglish (US)
Pages (from-to)113--124
JournalTransactions of the Illinois State Academy of Science
Issue number1-2
StatePublished - 2008


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