Relative Variability of Hybrids Between the Darters, Etheostoma Spectabile and Percina Caprodes

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Abstract
A sample of F1 hybrids between the orangethroat darter, Etheostoma spectabile (Agassiz), and the logperch, Percina caprodes (Rafinesque), stocks from the San Gabriel River, Texas, varies widely in a number of morphologic characters. A similar variability of natural hybrids is often used as a criterion for hybrid fertility. Assuming hybrid fertility based only on high variability of wild hybrids is to be avoided. Hybrids of the same combination from Colorado River, Texas, stocks are no more variable that their parental stocks.