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Cytogenetics and Evolution of Simulium ornatipes Skuse (Diptera: Simuliidae). II. Temporal Variation in Chromosomal Polymorphisms and Homosequential Sibling Species

D. G. Bedo
Evolution
Vol. 33, No. 1, Part 2 (Mar., 1979), pp. 296-308
DOI: 10.2307/2407620
Stable URL: http://www.jstor.org/stable/2407620
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Cytogenetics and Evolution of Simulium ornatipes Skuse (Diptera: Simuliidae). II. Temporal Variation in Chromosomal Polymorphisms and Homosequential Sibling Species
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Abstract

Temporal fluctuations in patterns of linkage disequilibrium and heterozygote deficiency of chromosomal polymorphisms were analysed in four populations of the sibling species Simulium ornatipes A. Each population was subdivided into two groups, A1 and A2, in which Hardy-Weinberg frequency expectations are largely met. The possible causes of linkage disequilibrium and heterozygote deficiency in the pooled populations, i.e. migration, selection and non-random mating, are discussed. It is concluded that the two groups are reproductively isolated entities.

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