Normally, hormones such as prolactin and corticosterone influence bird behavior during the breeding season and affect their reproductive success. Ouyang, along with EEB assistant professor Michaela Hau, Roslin Institute professor Peter Sharp, Centre for Ecology & Hydrology ecophysiologist Alistair Dawson and Max Planck Institute for Ornithology technical assistant Michael Quetting found that hormone concentrations in wild house sparrows three weeks before the breeding system could predict how many offspring a breeding pair would later have. Sparrows with low levels of corticosterone before the breeding season were found to have raised the most offspring.
The study showed that prolactin and corticosterone play essential regulatory roles before reproduction. If individual hormonal composition is inherited, the discrepancies between individuals could explain relative evolutionary success intraspecies.
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