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Adult sex ratios in the wild are usually female biased early in the season due to differential survival of males and females over winter but become increasingly male biased over time Zulian et al. Females may also respond to competition for males with direct aggression, potentially injuring competitors [7,8]. Mate guarding and male body condition shape male fertilization success and female mating system in the common quail. As a consequence of sperm limitation, males are expected to strategically allocate their Our study suggests that the perceived risk of sperm competition can influence male mate choice in the eastern mosquito fish. Males may have evolved mechanisms to adjust investment in reproduction in order to maximize fertilization oppor- tunities while minimizing the potential trade-offs between reproduction and other life-history traits Wedell et al. For male mate choice to be adaptive, choosy individuals need be sensitive to changes in sperm competition risk and to be able to adjust their mating preferences accordingly.
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Sperm depletion in the golden orb-weaving spider, Nephila clavipes Other means of sperm competition could include improving the sperm itself or its packaging materials spermatophore. The Handbook of Evolutionary Psychology 2nd ed.
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