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Egalitarian cooperation linked to central oxytocin levels in communal breeding house mice. | LitMetric

Egalitarian cooperation linked to central oxytocin levels in communal breeding house mice.

Commun Biol

Mammalian Behaviour & Evolution Group, Department of Evolution, Ecology and Behaviour, University of Liverpool, Leahurst Campus, Neston, CH64 7TE, UK.

Published: September 2024

AI Article Synopsis

  • Adult female relationships are crucial for studying diversity in animal social systems, particularly in how they cooperate for reproductive success.
  • In house mice, females with higher oxytocin levels in a specific brain region (the PVN) show more effective and equal cooperation when raising young together, resulting in more offspring.
  • However, oxytocin levels do not influence reproductive success when females do not cooperate, suggesting that this hormone plays a key role in fostering egalitarian social connections that can impact evolutionary fitness.

Article Abstract

Relationships between adult females are fundamental to understanding diversity in animal social systems. While cooperative relationships between kin are known to promote fitness benefits, the proximate mechanisms underlying this are not well understood. Here we show that when related female house mice (Mus musculus domesticus) cooperate to rear young communally, those with higher endogenous oxytocin levels have more egalitarian and successful cooperative relationships. Sisters with higher oxytocin concentrations in the paraventricular nucleus (PVN) of the hypothalamus weaned significantly more offspring, had lower reproductive skew and spent more equal proportions of time in the nest. By contrast, PVN oxytocin was unrelated to the number of weaned offspring produced in the absence of cooperation, and did not vary in response to manipulation of nest site availability or social cues of outgroup competition. By linking fitness consequences of cooperation with oxytocin, our findings have broad implications for understanding the evolution of egalitarian social relationships.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11436823PMC
http://dx.doi.org/10.1038/s42003-024-06922-yDOI Listing

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