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Social bet-hedging in vampire bats.

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Organisms may benefit from cooperating with nonrelatives to reduce social risks. Investing in more, lower-quality relationships, or "social bet-hedging," helps buffer against the loss of key partners, as seen in vampire bats.

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Area of Science:

  • Behavioral Ecology
  • Evolutionary Biology
  • Animal Social Networks

Background:

  • Cooperation with kin offers direct and indirect fitness benefits.
  • Cooperation with nonkin may seem less advantageous but can mitigate risks associated with limited kin networks.
  • Social environments can be unpredictable, necessitating strategies to reduce risks.

Purpose of the Study:

  • To investigate the concept of 'social bet-hedging' in cooperative relationships.
  • To determine if investing in a larger quantity of nonkin relationships reduces risks associated with partner loss.
  • To provide empirical evidence for social bet-hedging in a wild population.

Main Methods:

  • Studied food-sharing behavior in wild vampire bats (Desmodus rotundus).
  • Experimentally removed key food-sharing partners to assess the impact on resource acquisition.
  • Quantified the number of nonkin relationships each female maintained.

Main Results:

  • Females with more nonkin food-sharing partners experienced a smaller decrease in food intake when a primary partner was removed.
  • Investing in a greater quantity of nonkin relationships did not improve conditions under normal circumstances.
  • However, increased nonkin bonds enhanced resilience to the loss of crucial cooperative partners.

Conclusions:

  • The study provides evidence for social bet-hedging as a strategy to manage risks in social environments.
  • Investing in a larger number of weaker, nonkin relationships can buffer against the negative consequences of losing key partners.
  • Social bet-hedging influences the structure and formation of social networks, highlighting the importance of relationship quantity for stability.