Adjusting phenotypes via within- and across-generational plasticity

GABRIELA A AUGE; LINDSAY D LEVERETT; BRIANNE EDWARDS; KATHLEEN DONOHUE

NEW PHYTOLOGIST

WILEY-BLACKWELL PUBLISHING, INC

Año: 2017

0028-646X

There is renewed interest in how trans-generationalenvironmental effects, including epigenetic inheritance, contribute to adaptiveevolution.  The contribution of across-generation plasticity to adaptation, however, needs to be evaluated within the context of within-generation plasticity, which is often proposed to contribute more efficiently to adaptation because of the potentially greater accuracy of progeny than parental cues to predict progeny selective environments.  We highlight recent empirical studies of transgenerational plasticity, and find they do not consistently support predictions based on the higher predictive ability of progeny environmental cues.  We discuss these findings within the context of the relative predictive ability of maternal and progeny cues, costs and constraints of plasticity in parental and progeny generations, and the dynamic nature of the adaptive value of within andacross-generation plasticity that varies with the process of adaptation itself.  Such contingent and dynamically variable selection could account for the diversity of patterns of within- and across-generation plasticity observed in nature, and can influence the adaptive value of the persistence of environmental effects across generations.