Indirect selection of thermal tolerance during experimental evolution of Drosophila melanogaster

Catriona Condon, Ajjya Acharya, Gregory J. Adrian, Alex M. Hurliman, David Malekooti, Phivu Nguyen, Maximilian H. Zelic, Michael Angilletta

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Natural selection alters the distribution of a trait in a population and indirectly alters the distribution of genetically correlated traits. Long-standing models of thermal adaptation assume that trade-offs exist between fitness at different temperatures; however, experimental evolution often fails to reveal such trade-offs. Here, we show that adaptation to benign temperatures in experimental populations of Drosophila melanogaster resulted in correlated responses at the boundaries of the thermal niche. Specifically, adaptation to fluctuating temperatures (16-25°C) decreased tolerance of extreme heat. Surprisingly, flies adapted to a constant temperature of 25°C had greater cold tolerance than did flies adapted to other thermal conditions, including a constant temperature of 16°C. As our populations were never exposed to extreme temperatures during selection, divergence of thermal tolerance likely reflects indirect selection of standing genetic variation via linkage or pleiotropy. We found no relationship between heat and cold tolerances in these populations. Our results show that the thermal niche evolves by direct and indirect selection, in ways that are more complicated than assumed by theoretical models.

Original languageEnglish (US)
Pages (from-to)1873-1880
Number of pages8
JournalEcology and Evolution
Volume5
Issue number9
DOIs
StatePublished - May 1 2015

Keywords

  • Chill coma
  • Genetic correlation
  • Knockdown
  • Selection experiment
  • Thermal adaptation
  • Trade-offs

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Nature and Landscape Conservation

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    Condon, C., Acharya, A., Adrian, G. J., Hurliman, A. M., Malekooti, D., Nguyen, P., Zelic, M. H., & Angilletta, M. (2015). Indirect selection of thermal tolerance during experimental evolution of Drosophila melanogaster. Ecology and Evolution, 5(9), 1873-1880. https://doi.org/10.1002/ece3.1472