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Early life ecological conditions have well-documented short-term effects on offspring phenotype and survival, but the extent to which these effect carry-over into adulthood is much less known. Yet, unveiling such carry-over effects is essential to understand the evolution of parental life-history strategies. In altricial birds, the number of brood mates can affect competition regime and other nest...
Sex allocation theory predicts that parents are selected to bias their progeny sex ratio (SR) toward the sex that will benefit the most from parental quality. Because parental quality may differentially affect survival of sons and daughters, a pivotal test of the adaptive value of SR adjustment is whether parents overproduce offspring of the sex that accrues larger fitness advantages from high parental...
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