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Strong phenotypic plasticity limits potential for evolutionary responses to climate change

Vicencio Oostra,M. Saastamoinen,B. Zwaan,C. Wheat

Published 2018 in Nature Communications

ABSTRACT

Phenotypic plasticity, the expression of multiple phenotypes from one genome, is a widespread adaptation to short-term environmental fluctuations, but whether it facilitates evolutionary adaptation to climate change remains contentious. Here, we investigate seasonal plasticity and adaptive potential in an Afrotropical butterfly expressing distinct phenotypes in dry and wet seasons. We assess the transcriptional architecture of plasticity in a full-factorial analysis of heritable and environmental effects across 72 individuals, and reveal pervasive gene expression differences between the seasonal phenotypes. Strikingly, intra-population genetic variation for plasticity is largely absent, consistent with specialisation to a particular environmental cue reliably predicting seasonal transitions. Under climate change, deteriorating accuracy of predictive cues will likely aggravate maladaptive phenotype-environment mismatches and increase selective pressures on reaction norms. However, the observed paucity of genetic variation for plasticity limits evolutionary responses, potentially weakening prospects for population persistence. Thus, seasonally plastic species may be especially vulnerable to climate change. Phenotypic plasticity—the ability to express multiple phenotypes from the same genome—is a widespread adaptation to environmental variability. Here, Oostra et al analyze transcriptomes of an African butterfly with distinct seasonal phenotypes, and observe lack of variation for plasticity, limiting potential for evolutionary responses to climate change.

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