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The Journal of Heredity 1982:73(2):128-132
© 1982 The American Genetic Association 73:128-132

research-article

Genetic neighborhood structure of the salt marsh composite, Borrichia frutescens

Ann E. Antlfinger

Department of Botany and Institute of Ecology, University of Georgia Athens 30602

Abstract

The genetic neighborhood structure of the salt marsh composite, Borrichia frutescens, was determined with measured outcrossing rates and pollinator movements. Complete outbreeding was found for this species using the mixing mating model and genotypic frequency distributions for a polymorphic locus controlling the enzyme glutamate oxaloacetate transaminase (GOT). Pollinator observations confirmed this high outcrossing rate. Pollinator flight distributions were significantly leptokurtic within stands of B. frutescons suggesting restricted pollen flow. The foraging behavior of bees and butterflies were similar, but long-distance flights were not monitored. The effective neighborhood size of B. frutescens was 20–30 individuals and the neighborhood area was less than one square meter. Although this neighborhood structure suggests the potential for local differentiation, no deviations from random mating were observed in the genotypic frequency distributions of GOT.


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