PHYLOGENETIC-RELATIONSHIPS AMONG 4 MEMBERS OF STIZOSTEDION (PERCIDAE) DETERMINED BY MITOCHONDRIAL-DNA AND ALLOZYME ANALYSES

Phylogenetic relationships among four Stizostedion species were examined using mitochondrial DNA (mtDNA) and allozyme analyses. Twenty‐six allozyme loci were scored, and mtDNA variation was examined using 24 restriction endonucleases, yielding 48–57 restriction sites among the species. Genetic distance analyses show that the two North American species (S. canadense and S. vitreum) cluster in one group, while the two European species (S. hciopercu and S. vogense) form a second group. Nei's genetic distance between these two groups was 0.7 ± 0.2 for allozymes, while the corresponding mtDNA sequence divergence was 14.8 ± 2.0%, suggesting that these two groups diverged approximately 10 million years ago. Thus, these data are consistent with the hypothesis that Stizostedion colonized North America during the Pliocene. Copyright © 1991, Wiley Blackwell. All rights reserved