Selection in a fluctuating environment and the evolution of sexual dimorphism in the seed beetle Callosobruchus maculatus
2012 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 25, no 8, 1564-1575 p.Article in journal (Refereed) Published
Sexual dimorphism can be affected by environmental variables such as temperature. There are two hypotheses regarding sex differences in plasticity in a changing environment: the adaptivecanalization hypothesis, and the condition–dependence hypothesis. Here we use a quantitativegenetic framework to test these hypotheses and to investigate both immediate changes in, and theevolution of, sexual dimorphism in response to a changing environment (with and withoutfluctuations). We found a decreased sexual size dimorphism in higher temperature and femalesresponded more plastically than males, supporting the condition dependence hypothesis. However,selection in a fluctuating environment can alter sex-specific patterns of genetic and environmentalvariation, indicating support for the adaptive canalization hypothesis. Also, genetic correlationsbetween sexes (rMF) were affected by fluctuating selection, suggesting a facilitated independent evolution of the sexes. Thus, the selective past of a population is highly important for theunderstanding of the evolutionary dynamics of sexual dimorphism.
Place, publisher, year, edition, pages
2012. Vol. 25, no 8, 1564-1575 p.
Environmental change, genetic variance, experimental evolution, split brood experiment, sex-specific plasticity, sex-specific environmental sensitivity, insects, condition dependency, genetic correlations
Research subject Animal Ecology
IdentifiersURN: urn:nbn:se:uu:diva-159280DOI: 10.1111/j.1420-9101.2012.02541.xISI: 000306402800011PubMedID: 22594940OAI: oai:DiVA.org:uu-159280DiVA: diva2:443662