Intralocus Sexual Conflict and Environmental Stress
2014 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 68, no 8, 2184-2196 p.Article in journal (Refereed) Published
Intralocus sexual conflict (IaSC) occurs when selection at a given locus favors different alleles in males and females, placing a fundamental constraint on adaptation. However, the relative impact of IaSC on adaptation may become reduced in stressful environments that expose conditionally deleterious mutations to selection. The genetic correlation for fitness between males and females (r(MF)) provides a quantification of IaSC across the genome. We compared IaSC at a benign (29 degrees C) and a stressful (36 degrees C) temperature by estimating r(MF)s in two natural populations of the seed beetle Callosobruchus maculatus using isofemale lines. In one population, we found substantial IaSC under benign conditions signified by a negative r(MF) (-0.51) and, as predicted, a significant reduction of IaSC under stress signified by a reversed and positive r(MF) (0.21). The other population displayed low IaSC at both temperatures (r(MF): 0.38; 0.40). In both populations, isofemale lines harboring alleles beneficial to males but detrimental to females at benign conditions tended to show overall low fitness under stress. These results offer support for low IaSC under stress and suggest that environmentally sensitive and conditionally deleterious alleles that are sexually selected in males mediate changes in IaSC. We discuss implications for adaptive evolution in sexually reproducing populations.
Place, publisher, year, edition, pages
2014. Vol. 68, no 8, 2184-2196 p.
Adaptation, condition dependence, genetic quality, sexual selection, sexually antagonistic, temperature
Ecology Evolutionary Biology
IdentifiersURN: urn:nbn:se:uu:diva-232012DOI: 10.1111/evo.12439ISI: 000340470600003OAI: oai:DiVA.org:uu-232012DiVA: diva2:746817
FunderSwedish Research Council, 621-2010-5266EU, European Research Council, AdG-294333