Data from: Better-surviving barn swallow mothers produce more and better-surviving sons

Andrea Romano, Alessandra Costanzo, Manuela Caprioli, Marco Parolini, Roberto Ambrosini, Diego Rubolini & Nicola Saino
Sex allocation theory predicts that parents are selected to bias their progeny sex ratio (SR) towards 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 accrue larger fitness advantages from high parental quality. However, this crucial test of the long-term fitness consequences of sex...
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