A survey for molluscs in the White River near Newport, Arkansas, 1986
Miller, Andrew C.; Harris., John L.
Abstract: A survey for live molluscs and shells was made on 27-30 October 1986 in the White River, near Newport, Arkansas, river mile 254.6 to 230.7. Molluscs were collected at 12 dredged material disposal sites using divers equipped with SCUBA, and by hand on shore and in shallow water. Twenty-four species of unionid molluscs, in addition to the Asiatic clam, Corbicula fluminea, were collected alive and seven additional species were found only as shells. The existing fauna is dominated by thick-shelled species, Quadrula pustulosa (26.0 percent), Fusconaia ebena (22.4 percent), Ellipsaria lineolata (9.9 percent), Obovaria olivaria (7.3 percent), and Obliquaria reflexa (5.2 percent). Live species that made up less than 1 percent of the community included Anodonta grandis grandis, Corbicula fluminea, Cyprogenia aberti, Lampsilis teres, Lasmigona complanata, Potamilus laevissima, Tritogonia verrucosa, and Truncilla truncata. Live mussels were found in 1- to 2-m linear strips of sand and gravel within 20 m of shore, or in depositional zones with mud substrate. The endangered Potamilus capax and Lampsilis orbiculata were not collected alive; however, relict shells of the latter species were found at seven sites. Fresh L. orbiculata shells were collected at river mile 236.2 where previous workers reported finding this species alive, Other important sites on this reach of the White River for mussels are at river miles 250.0 (left descending bank) and 241.9 (right descending bank). The mussel fauna in this reach of the river has been stressed by maintenance dredging and to some extent by commercial harvesting and hypolimnetic reservoir releases upriver. However, evidence of recent recruitment was found for 10 species of unionids, many of which were collected in close proximity to previously dredged areas.
Environmental Laboratory (U.S.)
Freshwater mussels--White River (Ark.); Dredging--Environmental aspects; Endangered species