Young male blue tits are less successful in fathering offspring outside their breeding pair, not because of a lack of experience, but because they are outcompeted by older males, Bart Kempenaers and colleagues from the Max Planck Institute for Biological Intelligence in Germany report in a study publishing April 16 in the open-access journalMany birds form breeding pairs but will also mate and produce offspring outside of that pairing -- known as"extra-pair" paternity.
The authors add,"Our study indicates that the generally observed low extra-pair siring success of first-year males is due to competition with older males. This age effect is thus mediated by the social environment, at least in the blue tit."Chicago A new long-term study finds that male acorn woodpeckers breeding polygamously in duos or trios of males actually fathered more offspring than males breeding alone with a single female, contrary to ...
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Older male blue tits out-compete young males when it comes to extra-marital breedingYoung male blue tits are less successful in fathering offspring outside their breeding pair, not because of a lack of experience, but because they are outcompeted by older males, Bart Kempenaers and colleagues from the Max Planck Institute for Biological Intelligence in Germany report in a study published in the open-access journal PLOS Biology.
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