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MITOCHONDRIAL‐DNA DIVERSITY AND THE ORIGIN OF THE MENIDIA CLARKHUBBSI COMPLEX OF UNISEXUAL FISHES (ATHERINIDAE)

Restriction‐endonuclease analysis of mitochondrial DNA (mtDNA) of the unisexual M. clarkhubbsi complex and close sexual relatives indicated that the unisexual complex arose through multiple, nonreciprocal hybridizations involving females of M. peninsulae. High‐resolution analyses using restriction endonucleases that cleave at 4‐bp sites revealed mtDNA sequence diversity that was low among unisexuals but high among individuals of M. peninsulae. The identification of M. peninsulae as a parent of the unisexuals conflicts with some details of previous allozyme comparisons. One possibility is that the unisexuals were derived from hybridization involving M. beryllina and a recently extinct form of M. peninsulae.