Rediscovery of Labidesthes sicculus (Atherinidae) in Lake Texoma (Oklahoma-Texas)

摘要

Displacement of native species from their habitats has been linked to the introduction of nonindigenous species (Ross, 1991; Townsend and Crowl, 1991; Douglas et al., 1994). Ail example of this occurred in Lake Texoma (Oklahoma-Texas) where the abundance of native Labidesthes sicculus (brook silverside) decreased after the arrival of Menidia beryUina (inland silverside) in 1953. Riggs and Bonn (1959) reported L. sicculus as one of the most common species, second only to Dorosoma cepedianum (gizzard shad), in Lake Texoma from 1948 through 1952. However, it declined rapidly over the next 3 years, though it was still abundant in tributaries to the reservoir in 1955 (Dowell, 1956; Riggs and Bonn, 1959). By 1958, Riggs and Bonn (1959) no longer lbund specimens in the tributaries or reservoir despite considerable collecting effort. Contrary to this finding, in 1967, 2 adults were taken from the Buncombe Greek arm of the reservoir (Mense, 1967), and Smith and Powell (1971) collected a few individuals in Brier Creek, a tributary to Lake Texoma, suggesting that L. sicculus remained in the reservoir and tributary creeks, albeit in low abundance. However, W.J. Matthews (pers. comm.) stated that in more than 20 years of sampling Brier Creek, no L. sicculus have been taken, and a thorough sampling of Buncombe Creek in 1995 failed to produce a single specimen (Lienesch et al., 2000).