Exploring the structure of genetic variation and the influences of demography on effective population size in the gag grouper Mycteroperca microlepi (Goode & Bean)

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Using 11 microsatellite markers, genetic analyses of three successive year-classes of gag Mycteroperca microlepis juveniles across the north-eastern Gulf of Mexico revealed a lack of spatial structure and very little temporal variation between year-classes. These results are consistent with long-term effective population sizes on the order of 30 000 adults. The importance of reproductive-style and sex-ratio variation is discussed as an important influence on long-term effective sizes.
Original languageAmerican English
JournalJournal of Fish Biology
StatePublished - 2006
Externally publishedYes


  • Mycteroperca microlepis
  • effective population size
  • sex ratio


  • Genetics
  • Marine Biology

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