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A Comprehensive Evaluation of Three Mussel Beds in Reach 15 of the Upper Mississippi River. [electronic resource] (1997)

Author: Whitney, Scott D; Blodgett, K D; Sparks, Richard E; ILLINOIS NATURAL HISTORY SURVEY HAVANARIVER RESEARCH LAB
Subject: Biology; Ecology; Mussels; Ecology; Data processing; Density; Management; Monitoring; Recruiting; Sampling; Mississippi river; Low rate; Aquatic biology; Growth(physiology)
Publisher: Ft. Belvoir Defense Technical Information Center
Possible copyright status: NOT_IN_COPYRIGHT
Language: English
Call number: 42205
Digitizing sponsor: CARLI: Consortium of Academic and Research Libraries in Illinois
Book contributor: Lewis & Clark Community College and the National Great Rivers Research and Education Center
Collection: lewis_and_clark; americana
Notes: Page D-7 put into book upside down
Scanfactors: 6

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Description

Unionid mussels were collected by quadrat sampling at three mussel beds in Reach is 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 Plethohosus 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 within the mussel refuge, suggesting illegal harvest. Zebra mussels (Dreissena polymorpha) have become well established in Reach 15 with mean densities of 2,519 ZBM/m2 in July 1995 and unionid infestation at 48% by September 1995, Our data analysis and observations support the following management actions: (1) closing the commercial harvest of live Megalonaias nervosa lishing entire reaches of the UMR as mussel refuges, (3) developing population models to guide and assist the management of mussels, and (4) monitoring zebra mussel densities and impacts in the Mississippi River

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