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American Zoologist 1989 29(3):863-871; doi:10.1093/icb/29.3.863
© 1989 by The Society for Integrative and Comparative Biology
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Allozyme Variation in a Natural Population of the Nile Crocodile1

ROBIN LAWSON, CHRISTOPHER P. KOFRON2 and HERBERT C. DESSAUER
Osher Foundation Laboratory for Molecular Systematics and Department of Herpetology, California Academy of Sciences San Francisco, California 94118 Department of Biological Sciences, Stanford University Stanford, California 94305
Department of Biological Sciences, University of Zimbabwe Harare, Zimbabwe
Department of Biochemistry and Molecular Biology, Louisiana State University Medical Center New Orleans, Louisiana 70112

Blood samples were collected for allozyme studies from 92 Crocodylus niloticus from the Runde River in Gonarezhou National Park, southern Zimbabwe. Two (glucose phosphate isomerase and erythrocyte acid phosphatase) of 27 protein coding loci were polymorphic when examined by starch-gel electrophoresis. This amount of variability is similar to that found in another crocodilian, Alligator mississippiensis and is not unusually low as has been found in a number of large vertebrates. In a single semi-isolated population, allele frequencies at both polymorphic loci were in Hardy-Weinberg equilibrium suggesting a random mating pattern with no severe bottleneck effect in the founding of this population. Population F-statistics suggest that panmixia exists within and among the three main breeding sites studied.


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