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Summary: Molecular Ecology (2001) 10, 295303
© 2001 Blackwell Science Ltd
Blackwell Science, Ltd
Population genetic structure of the lemon shark (Negaprion
brevirostris) in the western Atlantic: DNA microsatellite
variation
K. A. FELDHEIM,* S. H. GRUBER and M. V. ASHLEY*
*Department of Biological Sciences, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL 60076, USA, Division of
Marine Biology and Fisheries, Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, Miami, FL
33149, USA
Abstract
DNA microsatellite markers were used to characterize the population genetic structure of
the lemon shark, Negaprion brevirostris, in the western Atlantic. This study demonstrates
for the first time the usefulness of microsatellites to study population genetic structure
and mating systems in the Chondricthyes. Lemon sharks (mostly juveniles) were sampled
non-destructively from four locations, Gullivan Bay and Marquesas Key in Florida, Bimini,
Bahamas, and Atol das Rocas, Brazil. At least 545 individuals were genotyped at each of
four dinucleotide loci. The number of alleles per locus ranged from 19 to 43, and expected
heterozygosities ranged from 0.69 to 0.90. Relatively little genetic structure was found in
the western Atlantic, with small but significant values for estimators of FST and RST among
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