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Title: An investigation of freshwater mussels (Unionidae) in the Tennessee River below Kentucky Lock and Dam
Authors: Miller, Andrew C.
Payne, Barry S.
Keywords: Freshwater mussels--Tennessee River--Geographical distribution
Unionidae--Effect of dams on
Stream animals--Kentucky
Publisher: Environmental Laboratory (U.S.)
U.S. Army Engineer Waterways Experiment Station.
Series/Report no.: Technical Report;EL-91-8
Abstract: A survey to assess community characteristics, density, population demography of dominant species, and the likelihood of finding endangered species of freshwater mussels (Unionidae) was conducted between river miles (RM) 22.4 and 19.0 in the lower Tennessee River during the period 31 August to 3 September 1990. Data were collected to analyze impacts of construction and operation of a second lock at Kentucky Lock and Dam, RM 22.4. Twenty-three species and 4,768 freshwater mussels were obtained in 287 qualitative collections. The bivalve fauna was dominated by two thick-shelled species, Amblema plicata (39.43 percent) and Fusconaia ebena (39.41 percent). Six species comprised 1 to 10 percent of the collection, and 15 species made up less than 1 percent of the collection. No Federally listed endangered species were found. Species diversity was moderate, and evenness was low. Unionid density at six sites in the area to be dredged ranged from 9.2 to 128.0 individuals per square meter. Corbicula fluminea density ranged from 6.0 to 26.4 individuals per square meter, which was considerably less than values reported in this river reach in 1969. The total commercial value of four species (A. plicata, Megalonaias nervosa, F. ebena, and Quadrula quadrula) within the area that will be dredged was estimated at $101,707. Total density of snails ranged from 8.0 to 86.8 individuals per square meter; the fauna was dominated by Pleurocera canaliculatum, with lesser numbers of Lithasia armigera and L. verrucosa. Impacts due to construction and operation of the second lock can be partially offset by creating submerged habitat with dredged material along an eroding bank downriver of the lock and dam (RM 19.0 to 21.0).
Appears in Collections:Technical Report

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