Plasticity for desiccation tolerance across Drosophila species is affected by phylogeny and climate in complex ways

Vanessa Kellermann, Ary A. Hoffmann, Johannes Overgaard, Volker Loeschcke, Carla M. Sgrò

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Comparative analyses of ectotherm susceptibility to climate change often focus on thermal extremes, yet responses to aridity may be equally important. Here we focus on plasticity in desiccation resistance, a key trait shaping distributions of Drosophila species and other small ectotherms. We examined the extent to which 32 Drosophila species, varying in their distribution, could increase their desiccation resistance via phenotypic plasticity involving hardening, linking these responses to environment, phylogeny and basal resistance. We found no evidence to support the seasonality hypothesis; species with higher hardening plasticity did not occupy environments with higher and more seasonal precipitation. As basal resistance increased, the capacity of species to respond via phenotypic plasticity decreased, suggesting plastic responses involving hardening may be constrained by basal resistance. Trade-offs between basal desiccation resistance and plasticity were not universal across the phylogeny and tended to occur within specific clades. Phylogeny, environment and trade-offs all helped to explain variation in plasticity for desiccation resistance but in complex ways. These findings suggest some species have the ability to counter dry periods through plastic responses, whereas others do not; and this ability will depend to some extent on a species placement within a phylogeny, along with its basal level of resistance.

Original languageEnglish
Article number20180048
Number of pages10
JournalProceedings of the Royal Society B: Biological Sciences
Volume285
Issue number1874
DOIs
Publication statusPublished - 14 Mar 2018

Keywords

  • Climate change
  • Desiccation
  • Phenotypic plasticity
  • Seasonality
  • Trade-off

Cite this

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abstract = "Comparative analyses of ectotherm susceptibility to climate change often focus on thermal extremes, yet responses to aridity may be equally important. Here we focus on plasticity in desiccation resistance, a key trait shaping distributions of Drosophila species and other small ectotherms. We examined the extent to which 32 Drosophila species, varying in their distribution, could increase their desiccation resistance via phenotypic plasticity involving hardening, linking these responses to environment, phylogeny and basal resistance. We found no evidence to support the seasonality hypothesis; species with higher hardening plasticity did not occupy environments with higher and more seasonal precipitation. As basal resistance increased, the capacity of species to respond via phenotypic plasticity decreased, suggesting plastic responses involving hardening may be constrained by basal resistance. Trade-offs between basal desiccation resistance and plasticity were not universal across the phylogeny and tended to occur within specific clades. Phylogeny, environment and trade-offs all helped to explain variation in plasticity for desiccation resistance but in complex ways. These findings suggest some species have the ability to counter dry periods through plastic responses, whereas others do not; and this ability will depend to some extent on a species placement within a phylogeny, along with its basal level of resistance.",
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Plasticity for desiccation tolerance across Drosophila species is affected by phylogeny and climate in complex ways. / Kellermann, Vanessa; Hoffmann, Ary A.; Overgaard, Johannes; Loeschcke, Volker; Sgrò, Carla M.

In: Proceedings of the Royal Society B: Biological Sciences, Vol. 285, No. 1874, 20180048, 14.03.2018.

Research output: Contribution to journalArticleResearchpeer-review

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