Author: Andrew C. Miller
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ISBN:
Category : Freshwater mussels
Languages : en
Pages : 56

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Languages : en
Pages : 0

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A survey to assess community characteristics, density, population demography of dominant species, and the presence of rare or endangered species of mussels (Family: Unionidae) was conducted in selected reaches of the Quiver River and Bogue Phalia, Mississippi, in 1994 and 1995 for the U.S. Army Engineer District, Vicksburg. Results are being used to assess the economic value of mussels in the project area and to determine the environmental effects of proposed maintenance dredging. The project area included a section of the Quiver River between its confluence with the Big Sunflower River immediately north of Highway 82 in Sunflower County to the Leflore-Tallahatchie county line. In the Bogue Phalia, the study area consisted of a reach between Highway 82 and Rosedale, west-central Bolivar County. Twenty-two species of native freshwater mussels were collected in the Quiver River; 26 sites were sampled using qualitative methods, and a total of 2,238 mussels were collected. The dominant mussel was Amblema p. plicata, which comprised over 67 percent of the mussel fauna. Plectomerus dombeyanus comprised 20 percent of the mussels. Overall species diversity (0.67 to 0.90) was low, mainly because of the dominance of A. p. plicata. Evidence of recent recruitment was low; approximately 7 percent of the species and 0.15 percent of the individuals collected were less than 30 mm total shell length. Overall mean density ranged from less than 8.6 individuals/square meter at River Mile (RM) 6.4 to 92.3 individuals/square meter at RM 19.7.

Author: Andrew C. Miller
Publisher:
ISBN:
Category : Freshwater mussels
Languages : en
Pages : 80

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Author: Andrew C. Miller
Publisher:
ISBN:
Category : Dredging
Languages : en
Pages : 134

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Languages : en
Pages : 0

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In October 1999, 14 sites along Luxapalila Creek between Steens, Mississippi, and Waterworks Road Bridge (River Mile 6.2), were searched for freshwater mussels (Family: Unionidae). All collecting was done by hand and without divers. The purpose was to obtain information that could be used to assess the effectiveness of reasonable and prudent measures and their terms and conditions to reduce impacts to mussels caused by downstream channelization that took place in 1994 to 1996. In addition, results would be used to determine the likelihood of future losses (or incidental take) of federally listed mussel species in the project area. Fifteen species of freshwater mussels, in addition to Corbicula fluminea (Asian clam), were collected. Live specimens of the endemc, federally listed threatened Pleurobema decisum (southern clubshell) was collected at one site. The most abundant living species were Quadrula asperata (Alabama orb) and Lampsilis sframinea claiboniensis (southern fatmucket) which comprised 31.2 and 19.5 percent of the fauna. The third and fourth most abundant species, Tritogonia vemicosa (pistolgrip) and Lampsilis omata (southern pocketbook), comprised 18.7 and 10.9 percent of the collection. The remaining 11 species each comprised less than 4 percent of the fauna. Mussel abundance has changed little in this stream, based upon results of a survey conducted in 1992 and studies conducted in 1997 and 1998.

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Languages : en
Pages : 0

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In 1997 divers and waders were used to search for freshwater mussels in Luxapalila Creek between Steens, MS, and Waterworks Road bridge (River Mile 6.2). The purpose was to obtain information that could be used to assess the effectiveness of reasonable and prudent measures and their terms and conditions to reduce impacts to mussels caused by downstream channelization. In addition, results would be used to determine the likelihood of future losses (or incidental take) of federally listed mussel species in the project area. Luxapalila Creek is within the range of the following endemic mussels: Pleurobema perovatum (ovate clubshell mussel) and Plearobema decisum (southern clubshell mussel), listed as endangered; and Medionidus acutissimus (Alabama moccasinshell mussel) and Lampsilis perovalis (orange-nacre mucket mussel), listed as threatened Fifteen species of bivalves, including Corbicula fluminea (Asian clam), were collected. Two federally listed endemic species were found: live specimens of L. perovalis and shells of P. decisum. The most abundant living species were Quadrula asperata (Alabama orb) and Lampsilis straminea claiborensis (southern fatmucket), which comprised 44.3 and 19.3 percent of the fauna. The third most abundant species, Lampsilis ornata (southern pockethook), comprised slightly more than 10 percent of the collection, and the remaining 12 species (including C. fluminea) each comprised less than 6 percent of the fauna. The species list for this creek is now 25. When these results were compared with findings from a study conducted by the U.S. Fish and Wildlife Service in 1992, it was determined that there have been few recent changes in the mussel community.

Author: Andrew C. Miller
Publisher:
ISBN:
Category : Freshwater mussels
Languages : en
Pages : 42

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