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Related Experiment Video

Updated: Jul 18, 2025

The Joint Effect of Social Comparison and Social Distance on Evaluation of Intertemporal Choice Outcomes in Event-related Potential Studies
08:24

The Joint Effect of Social Comparison and Social Distance on Evaluation of Intertemporal Choice Outcomes in Event-related Potential Studies

Published on: August 25, 2023

757

Opposing Responses to Scarcity Emerge from Functionally Unique Sociality Drivers.

Albert B Kao, Amanda K Hund, Fernando P Santos

    The American Naturalist
    |August 22, 2023
    PubMed
    Summary

    Organisms benefit from group living, but face competition. This study shows that the primary benefit of sociality determines if group sizes shrink or grow when resources become scarce.

    Keywords:
    cooperationoptimal group sizeresource abundanceresource scarcitysocial behavior

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    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Behavioral Ecology

    Background:

    • Organisms across taxa form groups, gaining benefits like resource acquisition and predator defense.
    • However, group living incurs costs, primarily increased competition for resources.
    • Responses in group size to resource scarcity vary, with some species decreasing, while others maintain or increase group size.

    Purpose of the Study:

    • To explain the divergent responses of group sizes to resource scarcity across species.
    • To investigate the role of different sociality benefits in mediating group size adjustments under resource limitation.

    Main Methods:

    • Developed a conceptual framework and theoretical model based on a literature review.
    • Categorized resource-related benefits of sociality into six distinct classes.
    • Modeled the impact of these benefits on individual survival in groups under varying resource conditions.

    Main Results:

    • The dominant benefit of sociality significantly influences whether optimal group size increases, decreases, or remains constant with declining resource abundance.
    • Model predictions align with existing, albeit limited, empirical data across diverse taxa.
    • Resource competition is a key factor, but the specific benefits of sociality dictate the adaptive response.

    Conclusions:

    • Differences in how group size responds to resource declines are driven by the primary benefits of sociality for a given species.
    • Understanding the dominant sociality mechanism is crucial for predicting group dynamics under environmental change.
    • This framework provides a unified explanation for varied group size responses to resource scarcity.