Abstract
Field censuses, breeding experiments, and a quantitative model are used to obtain insight into the extent and consequences of genetic mixing between locally adapted populations of a desert spider. Typically, 9% of the matings of desert riparian spiders (non-aggressive phenotype) in native habitat involve an arid-land partner (aggressive phenotype). Mating was found to be random with respect to behavioral phenotype, but linearly related to both the rate of immigration and survival of immigrants from surrounding arid habitats in the riparian area. Genetic mixing between riparian and arid-land spiders produces offspring that exhibit lower rates of survival in riparian habitat. Two extreme behavioral phenotypes were also observed in the field studies: approximately 5% of the female spiders attacked all males they encountered while another 22% ran from all potential mates. Punnett square analyses of the potential genotypes produced by introgression between arid- and riparian-adapted spiders indicate that these extreme phenotypes appear in F2 generation hybrids and backcrosses. Because there is a costly wastage of gametes in the case of mixed phenotype mating, model results indicate that within three generations of the cessation of gene flow, the riparian population would be free of mixed genotypes and moving towards genetic differentiation.
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Riechert, S.E., Singer, F.D., Jones, T.C. (2001). High gene flow levels lead to gamete wastage in a desert spider system. In: Hendry, A.P., Kinnison, M.T. (eds) Microevolution Rate, Pattern, Process. Contemporary Issues in Genetics and Evolution, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0585-2_19
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DOI: https://doi.org/10.1007/978-94-010-0585-2_19
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