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Contrasting patterns of genetic structure and evolutionary history as revealed by rnitochondrial DNA and nuclear gene-enzyme variation betweenDrosophila melanogaster andDrosophila simulans

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Abstract

Drosophila melanogaster and its sibling speciesD. simulans have a cosmopolitan distribution. Studies on nuclear gene-enzyme variation from natural populations of these species reveal that the two have almost equal overall heterozygosity, yetD. simulans populations are significantly less differentiated. However, it is not clear whether this difference in population structure represents a difference in the genetic strategy with which they respond to the same adaptive challenges, or is the result of difference in species history. To help answer this question, we have undertaken an intensive survey of restriction fragment length polymorphisms of mitochondrial DNA (mtDNA) fromD. simulans; the results are compared with those fromD. melanogaster. We surveyed 69 isofemale lines ofD. simulans from four continents and seven lines from the Seychelles Islands. Ten restriction enzymes detected 104 restriction sites in the continental mtDNAs, of which only threeHinf1 sites were variable and account for fourHlnf1 (restriction variants) haplotypes. These four variants were all found in geographically distant locations. By contrast, twenty-three haplotypes were observed inD. melanogaster, many of which were observed in only one population. It would seem, therefore, that these two species have had different histories. Specifically, cosmopolitan populations ofD: simulans are probably products of a comparatively recent expansion from a source population in Africa. These results do not negate differences in their genetic strategy of adaptation, but they do show the importance of historical contingency in the present-day pattern of geographic variation.

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  1. Lawrence R. Hale

    Present address: Department of Biology, University of Prince Edward Island, C1A 4P3, Charlottetown, P. E. I., Canada

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  1. Department of Biology, McMaster University, L8S 4K1, Hamilton, Ontario, Canada

    Lawrence R. Hale & Rama S. Singh

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  2. Rama S. Singh
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Hale, L.R., Singh, R.S. Contrasting patterns of genetic structure and evolutionary history as revealed by rnitochondrial DNA and nuclear gene-enzyme variation betweenDrosophila melanogaster andDrosophila simulans . J Genet 70, 79–89 (1991). https://doi.org/10.1007/BF02927808

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