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Related Experiment Videos

Social evolution: lazy wasps look to the future.

Ashleigh Griffin1

  • 1Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, King's Buildings, Edinburgh EH9 3JT, UK. a.griffin@ed.ac.uk

Current Biology : CB
|August 8, 2006
PubMed
Summary

Female hairy-faced hover wasps exhibit varying foraging behaviors to aid dominant breeders. This research reveals that these helpers make decisions based on future expectations, influencing their level of assistance.

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Area of Science:

  • Behavioral Ecology
  • Evolutionary Biology
  • Animal Behavior

Background:

  • Female hairy-faced hover wasps (Helophilus pendulus) are known to act as helpers.
  • These helpers forage for the offspring of a dominant breeder within their social group.
  • There is variation in the foraging effort among individual helpers.

Purpose of the Study:

  • To investigate the decision-making process of female hairy-faced hover wasps regarding their foraging effort.
  • To determine if future expectations influence helping behavior in this species.
  • To understand the adaptive significance of varying levels of assistance in social insect populations.

Main Methods:

  • Observational studies of foraging activity in natural populations.
  • Behavioral assays to quantify individual helping effort.

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  • Analysis of factors influencing foraging decisions, including potential future reproductive opportunities.

    • Main Results:

    • Significant variation in foraging rates was observed among individual female helpers.
    • Helper foraging effort was correlated with future prospects, suggesting a predictive element in their behavior.
    • The study identified key factors that influence a helper's decision to invest more or less in provisioning the dominant breeder's young.

    Conclusions:

    • Female hairy-faced hover wasps make strategic decisions about helping based on future outlooks.
    • This future-oriented decision-making is a crucial factor in the evolution of cooperative breeding systems.
    • Understanding these complex behaviors provides insights into the ecological and evolutionary pressures shaping sociality in insects.