A database containing 1,234 records of Corbicula fluminea in Texas was created based on published literature accounts, survey reports by Texas Parks and Wildlife Department, unpublished records from university and museum collections, personal communications and author's data. This invasive, exotic bivalve was first collected in Texas in the Neches River in 1958 and was next found in El Paso in 1964. Initial presence on opposite sides of the state supports invasion occurring from the west and east. Corbicula fluminea has since colonized all major drainage basins in Texas. By 2005, it was known from 162 lotic and 174 lentic waterbodies located in 180 of 257 Texas counties. There was a positive significant correlation between the percentage of invaded waterbodies by reservoir size (Pearson r2 = 0.78) and stream order (Spearman R = 0.65). Corbicula populations were found more often in larger reservoirs and higher-order streams and were usually rare to absent in the smallest. Unless precluded by lack of permanent water or inadequate physicochemical parameters, C. fluminea may colonize most of Texas streams greater than second order and all but the smallest impoundments.
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Vol. 24 • No. 2