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Sexual cannibalism as a female resistance trait: a new hypothesis.
Evolution; International Journal of Organic Evolution 2024 January 28
Female spiders and praying mantises are renowned for their cannibalism of male partners before, during, or after mating. While several hypotheses have been proposed to explain species-specific examples of sexual cannibalism, much variation remains unexplained, including why the timing of cannibalism varies across taxa. Here, I outline how sexually cannibalistic behaviour could evolve via sexually antagonistic selection as a type of behavioural resistance to male-imposed mating costs, and how such a generalisable interpretation provides a framework for understanding the evolution of both sexual cannibalism in females and anti-cannibalistic traits in males. I discuss how differences between mating systems that physiologically constrain males to mate only once (monogyny) or twice (bigyny) and systems where the sexes can potentially mate multiply (polygyny and polyandry) are likely to influence how sexual conflict shapes cannibalistic behaviour. I review key examples from the literature that suggest how sexually cannibalistic behaviour might function as a female resistance trait and provide comprehensive predictions for testing this hypothesis empirically.
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