Genetic structure of summer flounder (Paralichthys dentatus) populations north and south of Cape Hatteras

  • Jones W
  • Quattro J
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Abstract

Genetic divergence among samples of summer flounder (Paralichthys dentatus, Linnaeus) was estimated to evaluate the effect of Cape Hatteras, a well-known zoogeographic barrier in the western Atlantic Ocean, on intraspecific gene flow. Previous studies based on meristic and morphometric variation and tagging data suggested that gene flow might be limited among summer flounder populations north and south of Cape Hatteras, although the high vagility of both juveniles and adults suggests otherwise. We analyzed genetic diversity revealed in the mitochondrial DNA (mtDNA) control region in samples of juveniles and adults collected in 1992 to 1995 from coastal sites from Buzzard's Bay, Massachusetts to Charleston, South Carolina. In contrast to previous morphological studies, analyses of mtDNA variation reveal no significant population subdivision centered around Cape Hatteras.

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Authors

  • W. J. Jones

  • J. M. Quattro

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