Complex effects of helper relatedness on female extra-pair reproduction in a cooperative breeder

Gabriela Karolina Hajduk, Andrew Cockburn, Helen Osmond & Loeske Kruuk
In cooperatively-breeding species, the presence of male helpers in a group often reduces the breeding female’s fidelity to her social partner, possibly because there is more than one potential sire in the group. Using a long-term study of cooperatively-breeding superb fairy-wrens (Malurus cyaneus) and records of paternity in 1936 broods, we show that the effect of helpers on rates of extra-pair paternity varied according to the helpers’ relatedness to the breeding female. The presence of...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
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