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Yukie Sato, Martijn Egas, Maurice W. Sabelis and Atsushi Mochizuki Male–male aggression peaks at intermediate relatedness in a social spider mite Ecology and Evolution 3

Version of Record online: 2 JUL 2013 | DOI: 10.1002/ece3.661

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Inclusive fitness theory predicts that when individuals live in groups or colonies, aggression should peak at intermediate levels of average relatedness in the colony. Here, we study how male–male aggression varies with average relatedness in naturally occurring colonies of the social spider mite Stigmaeopsis miscanthi. In support of theory, male–male aggression and weapon size strongly peak at intermediate average relatedness.

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