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Effect of Stressful and Nonstressful Growth Temperatures on Variation of Sternopleural Bristle Number in Drosophila melanogaster

Oleg A. Bubliy, Volker Loeschcke and Alexandra G. Imasheva
Evolution
Vol. 54, No. 4 (Aug., 2000), pp. 1444-1449
Stable URL: http://www.jstor.org/stable/2640640
Page Count: 6
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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.
Effect of Stressful and Nonstressful Growth Temperatures on Variation of Sternopleural Bristle Number in Drosophila melanogaster
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Abstract

The effect of stressful (31⚬C) and nonstressful (25⚬C) growth temperatures on quantitative variation and developmental stability (fluctuating asymmetry) of Drosophila melanogaster was examined in a short-term selection experiment on sternopleural bristle number. Realized heritabilities based on 10 generations of selection in an upward direction did not differ between the two temperature regimes, which indicated that additive genetic variation was not affected by a high, stressful temperature. Phenotypic variability and fluctuating asymmetry of sternopleural bristles were significantly higher under stressful conditions when averaged over generations, although most pairwise comparisons in separate generations showed nonsignificant differences between temperatures.

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