Abstract of
Dowling, T.E., G.R. Smith, and W.M. Brown. 1989. Reproductive
isolation and introgression between Notropis cornutus and
Notropis chrysocephalus (Family Cyprinidae): Comparison of
morphology, allozymes, and mitochondrial DNA. Evolution
43(3):620-634.
Replicate natural populations of these two minnows show different
character combinations in different environments. Morphology,
allozymes, and mtDNA segregation is completely uncorrelated.