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Phenotypic Plasticity and Reaction Norms in Temperate and Tropical Populations of Drosophila melanogaster: Ovarian Size and Developmental Temperature

Jean-Marie Delpuech, Brigitte Moreteau, Joelle Chiche, Eliane Pla, Joseph Vouidibio and Jean R. David
Evolution
Vol. 49, No. 4 (Aug., 1995), pp. 670-675
DOI: 10.2307/2410320
Stable URL: http://www.jstor.org/stable/2410320
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.
Phenotypic Plasticity and Reaction Norms in Temperate and Tropical Populations of Drosophila melanogaster: Ovarian Size and Developmental Temperature
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Abstract

The plasticity of ovariole number relative to developmental temperature was studied in three populations of Drosophila melanogaster at both ends of the cline: a temperate French population and two equatorial Congolese. Ovary size was much greater in the French flies, in agreement with an already known latitudinal cline. Among isofemale lines, significant differences in genetic variability were observed between populations with a maximum variability at intermediate temperatures. Parameters of phenotypic variability (CV and FA) were not statistically different among lines or populations, but a significant increase at low temperature was demonstrated for both. The shapes of the response curves (i.e., the norm of reaction) were analyzed by adjusting the data to a quadratic equation. The parameters of the equation were highly variable among lines. On the other hand, the temperature for maximum value of ovarioles (TMV) was much less variable and exhibited only a slightly significant difference between temperate and tropical flies (22.2⚬C vs. 22.7⚬C). During its geographic extension toward colder places, D. melanogaster underwent a large, presumably adaptative, increase in ovariole number but very little change in the norm of reaction of that trait.

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