Blacktail Shiner (Cyprinella lutrensis and C. venusta) in Texas, but Evidence of Introgression among Three Lineages of the C. lutrensis Species Group

摘要: Hybridization is more common in actinopterygian fishes than any other group of vertebrates. This especially true for members the family Cyprinidae; example, Hubbs found 68 different combinations inter-generic and intrageneric hybridization among cyprinids collected east continental divide. between two cyprinid species, red shiner blacktail (Cyprinella lutrensis C. venusta), has been described detail Georgia where an introduced species. However, not thoroughly assessed species are naturally sympatric. Our specific objectives were to determine extent ongoing using nuclear markers morphometrics historical introgression mitochondrial DNA (mtDNA). We 100 individuals from four locations along Bosque River additional Paluxy River. used amplified fragment length polymorphism (AFLP) verify identification hybrid status each individual. A total 56 AFLP fragments scored, with 82.14% (47 fragments) being polymorphic (95% criterion). Based on these markers, we only identified hybrids out 200 specimens analyzed; one River, Texas Texas. There no instances (mtDNA) into background did, however, discover sympatric occurrence three mtDNA lineages within a single gene pool; there was lineage venusta. Overall body shape truss network be statistically having shorter deeper body. The minimal amount inferred data, combination absence limited morphological overlap, indicates that pre- or postzygotic isolating mechanisms effectively minimize genetic exchange populations venusta river systems.