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Temperature Effects on Life History Variation in Drosophila simulans

P. A. Murphy, J. T. Giesel and M. N. Manlove
Evolution
Vol. 37, No. 6 (Nov., 1983), pp. 1181-1192
DOI: 10.2307/2408840
Stable URL: http://www.jstor.org/stable/2408840
Page Count: 12
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Temperature Effects on Life History Variation in Drosophila simulans
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Abstract

Temperature exerts a profound influence on the phenotypic expression of life history traits in Drosophila simulans. This population does not appear well adapted to high temperatures. Heritability estimates were low to zero for all traits when averaged over all temperature treatments. Although this might be interpreted as evidence precluding the possibility of further directional evolution of fitness traits in a temperature variable environment, the high proportion of additive effects at specific temperatures allows other interpretations. Our data do not support the suggestions of Parsons (1982) or Derr (1980) that additive variance is preponderantly important under conditions of extreme stress. Genotype by environment interactions appear to be very important in the determination of life history phenotypes of Drosophila simulans. We feel that the genetic architecture of fitness traits may be primarily influenced by variable selection pressures and possibly by genotype-specific habitat choice in wild populations.

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