Etheostoma spectabile pulchellum (Orangethroat darter) and E. radiosum paludosum (Orangebelly darter) inhabit, but do not co-occur, in the Washita River, Oklahoma. Behavioral isolation between these two allopatric taxa has evolved to an intermediate degree that is consistent with their genetic distance. Behavioral isolation is asymmetric. Mating was commonly observed between E. r. paludosum females and E. s. pulchellum males, but only rarely between E. r. paludosum males and E. s. pulchellum females.
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The American Midland Naturalist
Vol. 150 • No. 2
October 2003
Vol. 150 • No. 2
October 2003