Published April 22, 2021 | Version v4

Extra-pair paternity explains cooperation among neighbours in a bird

  • 1. University of Latvia
  • 2. University of Bergen
  • 3. Daugavpils University
  • 4. University of Tartu
  • 5. University of Auckland
  • 6. University of Turku

Description

In many social animals, females mate with multiple males, but the adaptive role of female extra-pair mating is not fully understood. This data set tests whether male pied flycatchers (Ficedula hypoleuca) engaging in extra-pair copulations with neighbouring females were more likely to assist their neighbours in predator mobbing. It shows that extra-pair sires joined mobs more often, approached predators more closely, and attacked predators more aggressively than males without extra-pair offspring in the neighbouring nest. Our results support theoretical predictions suggesting that extra-pair mating incentivizes males to assist in nest defences. 

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