Vanishing chromosomal inversion clines in drosophila subobscura from Chile: Is behavioral thermoregulation to blame?

Luis E. Castañeda, Joan Balanyà, Enrico L. Rezende, Mauro Santos

Research output: Contribution to journalArticleResearchpeer-review

21 Citations (Scopus)

Abstract

Chromosomal inversion clines paralleling the longstanding 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 (Tp) has evolved in Chile for females, with higher-latitude flies having a lower mean Tp. Plastic responses in Tp 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. © 2013 by The University of Chicago.
Original languageEnglish
Pages (from-to)249-259
JournalAmerican Naturalist
Volume182
Issue number2
DOIs
Publication statusPublished - 1 Aug 2013

Keywords

  • Bogert effect
  • Chromosomal inversion polymorphism
  • Clinal variation
  • Phenotypic plasticity
  • Temperature
  • Thermal preferences

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