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Although interspecific competition has long been recognised as a major driver of trait divergence and adaptive evolution, relatively little effort has focused on how it influences the evolution of intraspecific cooperation. Here we identify the mechanism by which the perceived pressure of interspecific competition influences the transition from intraspecific conflict to cooperation in a facultative...
Most social aphids are found within plant galls, inside of which clonally‐derived family groups feed, and specialized larval castes forego reproduction and perform various cooperative tasks, including group defence. When unrelated aphids move between clones, conditions are ripe for conflict because galls and cooperative defence are shared resources that are vulnerable to exploitation. A key unknown...
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