Southwest Electric Power Company (SWEPCO) Lake in northwest Arkansas is a thermal cooling pond for the Flint Creek Power Station. This reservoir has been regularly stocked with Florida bass (Micropterus floridanus) on top of a pre-existent largemouth bass (M. salmoides) population since its creation in 1976. Allozyme analysis of diagnostic loci in 1995-1996 revealed that 62% of the alleles were Florida bass alleles and that most fish were FX hybrids (77%). Microsatellite analysis of diagnostic loci in 2006 revealed that 78% of the alleles were Florida bass alleles and that most fish were FX-Florida hybrid bass (59%), with the remainder designated as Florida bass. The ongoing stocking of Florida bass and the possibility of a selective advantage for Florida bass alleles in a thermal pond may account for these temporal reductions in largemouth bass allele frequencies.
Allen, R. and Johnson, Ronald L.
"Temporal Changes of Largemouth Bass Alleles in a Northern Arkansas Reservoir Stocked with Florida Bass,"
Journal of the Arkansas Academy of Science: Vol. 63
, Article 7.
Available at: http://scholarworks.uark.edu/jaas/vol63/iss1/7