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Choice of high-quality mates versus avoidance of low-quality mates.
Evolution; International Journal of Organic Evolution 2018 November 14
Research in sexual selection assumes that individuals attempt to choose high-quality mates, and that sexual signals evolve to indicate high quality. But it may often be more important to instead discriminate and avoid low-quality mates, thus reducing the likelihood of large penalties in fitness. We show, using simulations, that avoidance of low-quality mates (i.e., rejecting low-quality and accepting either high- or medium-quality mates) evolves in socio-ecological circumstances such as monogamy with moderate opportunities for choice, costly choice, or abundant low-quality mates. We also show that this strategy is qualitatively different from choosing high-quality mates (i.e., preferring high-quality over medium- and low-quality mates). Rather than selecting signals that distinguish high- from low- and medium-quality mates, avoiding low-quality mates selects for signals or cues attuned at discriminating low-quality mates from the remaining (e.g., low-cost signals, absence of signaling mistakes). This may help explain the high diversity of sexual signals in nature, and their high evolutionary turnover with frequent losses and replacements (rather than reductions/increases of the same signal) over evolutionary time.
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