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Title: Vanishing chromosomal inversion clines in Drosophila subobscura from Chile: Is behavioral thermoregulation to blame?
Author: Castaneda, L.E.
Balanyà i Maymó, Joan
Rezende, E.L.
Santos Maroño, Mauro
Keywords: Polimorfisme genètic
Drosòfila subobscura
Genètica molecular
Genetic polymorphisms
Drosophila subobscura
Molecular genetics
Issue Date: Aug-2013
Publisher: University of Chicago Press
Abstract: Chromosomal inversion clines paralleling the long-standing ones in native Palearctic populations of Drosophila subobscura evolved swiftly after this species invaded the Americas in the late 1970s and early 1980s. However, the new clines did not consistently continue to converge on the Old World baseline. Our recent survey of Chilean populations of D. subobscura shows that inversion clines have faded or even changed sign with latitude. Here, we investigate the hypothesis that this fading of inversion clines might be due to the Bogert effect, namely, that flies' thermoregulatory behavior has eventually compensated for environmental variation in temperature, thus buffering selection on thermal-related traits. We show that latitudinal divergence in thermal preference (T-p) has evolved in Chile for females, with higher-latitude flies having a lower mean T-p. Plastic responses in T-p also lessen latitudinal thermal variation because flies developed at colder temperatures prefer warmer microclimates. Our results are consistent with the idea that active behavioral thermoregulation might buffer environmental variation and reduce the potential effect of thermal selection on other traits as chromosomal arrangements.
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It is part of: American Naturalist, 2013, vol. 182, num. 2, p. 249-259
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ISSN: 0003-0147
Appears in Collections:Articles publicats en revistes (Genètica, Microbiologia i Estadística)

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