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Using a Comparative Species Approach to Investigate the Neurobiology of Paternal Responses
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Large-brained birds display lower extra-pair paternity.

Yating Liu1,2, Zhengjun Wu1,2, Wenbo Liao3

  • 1Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guangxi Normal University, Guilin, China.

Integrative Zoology
|February 18, 2022
PubMed
Summary
This summary is machine-generated.

Extra-pair paternity (EPP) in birds is less common in species with larger relative brain sizes. This suggests that enhanced cognitive abilities may promote stable pair bonds over seeking extra-pair mating opportunities.

Keywords:
brain sizecognitive abilityextra-pair paternitylife historysexual selection

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Ornithology

Background:

  • Extra-pair paternity (EPP) influences reproductive success and sexual selection in birds.
  • The "relationship intelligence hypothesis" posits that cognitive abilities are crucial for maintaining pair bonds.

Purpose of the Study:

  • To investigate the relationship between EPP frequency, brain size, testis size, and life-history traits in 315 bird species.
  • To test the role of cognitive abilities in shaping mating strategies.

Main Methods:

  • Phylogenetically controlled comparative analyses were used.
  • Path analysis was employed to examine correlations between EPP, relative brain size, testis size, and life-history traits, controlling for body mass and shared ancestry.

Main Results:

  • EPP frequency showed a negative correlation with relative brain size.
  • EPP frequency was positively correlated with testis size.
  • No significant links were found between EPP frequency and life-history traits such as incubation period, fledging period, clutch size, egg mass, or longevity.

Conclusions:

  • Larger-brained bird species tend to have lower EPP frequencies.
  • Enhanced cognitive abilities in birds may favor stable pair bonding and mutualism over increased EPP.
  • Brain size, rather than life-history traits, appears to be a significant factor influencing mating strategies related to EPP.