Population genetics and gene variation in screwworms (Diptera: Calliphoridae) from Brazil |
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| Authors: | David B Taylor Richard D Peterson II Gonzalo E Moya-Borja |
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| Institution: | (1) Midwest Livestock Insects Research Laboratory, USDA-ARS, Department of Entomology, University of Nebraska, 68583 Lincoln, Nebraska;(2) USDA-ARS, Room 305, Plant Industry Building, East Campus, UNL, 68583 Lincoln, Nebraska;(3) Universidade Federal Rural do Rio de Janeiro, Rio de Janeiro, Brazil |
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| Abstract: | Allozyme variation in New World screwworm,Cochliomyia hominivorax (Coquerel), populations from Brazil was examined. Variability was observed in 8 of 13 enzyme loci and the frequency of the
most common allele was <0.95 for seven loci. Observed and expected heterozygosities were 0.159 and 0.165, respectively. Comparisons
of the Brazilian populations with previously studied populations from Costa Rica resulted in Nei's genetic distances of between
0.000 and 0.006, with the greatest distance being between populations within Brazil. Comparisons with Mexican populations
using only three loci resulted in genetic distances ≤0.031. Goodness-of-fit statistics for Hardy-Weinberg equilibrium and
Wright'sF statistics indicated small deviations from expected equilibrium genotype frequencies and low levels of differentiation between
populations within Brazil. Differentiation among screwworm populations from Brazil, Costa Rica, and Mexico was minimal. |
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| Keywords: | Cochliomyia hominivorax population genetics isozymes |
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