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Kin selection promotes female productivity and cooperation between the sexes

posted Mar 16, 2017, 12:32 AM by Jacek Radwan   [ updated May 16, 2017, 7:05 AM by Piotr Bentkowski ]
Hamilton’s theory of kin selection explains the evolution of costly traits that benefit other individuals by highlighting the fact that passing genes to offspring is not the only way of increasing the representation of those genes in subsequent generations: Genes are also shared with other classes of relatives. Consequently, any heritable trait that affects fitness of relatives should respond to kin selection. In the article just published in Science Advances we tested this core prediction of kin selection theory by letting bulb mites (Rhizoglyphus robini) evolve in populations structured into groups of relatives or nonrelatives during the reproductive phase of the life cycle. In accordance with predictions derived from kin selection theory, we found that evolution in groups of relatives resulted in increased female reproductive output. This increase at least partly results from the evolution of male traits that elevate their partners’ fecundity. Thus, our results demonstrate that kin selection can mediate sexual conflict and, more generally, highlight the power and universality of kin selection. Press release (in Polish)