Influence of the social context on division of labor in ant foundress associations

Raphaël Jeanson, Jennifer Fewell

    Research output: Contribution to journalArticle

    29 Citations (Scopus)

    Abstract

    Previous studies indicate that division of labor can arise spontaneously in social groups. The comparison between normally social populations and forced associations of solitary individuals allows us to dissect the mechanisms by which tasks are distributed within a group and to ask how selection acts on division of labor during the incipient stages of sociality. In some ant species, newly mated queens form cooperative associations during nest initiation, in which individuals specialize on different tasks. The harvester ant Pogonomyrmex californicus shows geographical variation across populations in colony-founding strategies: solitary founding (haplometrosis) and group founding (pleometrosis). This system provides a unique opportunity to investigate how social context affects division of labor during social evolution. We created groups containing normally solitary, normally group founding, or mixed groups of solitary and social queens to examine how social phenotype affects division of labor. We also examined how group size affects task specialization by comparing pairs of queens with groups of 6 queens. Division of labor arose consistently across all associations. Groups of haplometrotic or pleometrotic queens differentiated into an excavation and a brood care specialist. In mixed groups, the haplometrotic queens took the role of excavator whereas the pleometrotic queens mainly tended brood. Our data also show that the intensity of specialization was greater in larger associations, consistent with current models of group size and division of labor. We discuss these data in the context of how emergence and selection act on the evolution of division of labor within incipient social groups.

    Original languageEnglish (US)
    Pages (from-to)567-574
    Number of pages8
    JournalBehavioral Ecology
    Volume19
    Issue number3
    DOIs
    StatePublished - 2008

    Fingerprint

    polyethism
    Ants
    labor division
    queen insects
    ant
    Formicidae
    Population
    group size
    Pogonomyrmex californicus
    Phenotype
    colony founding
    excavators
    brood rearing
    geographical variation
    cooperatives
    eclosion
    phenotype
    nest
    excavation
    nests

    Keywords

    • Behavioral differentiation
    • Division of labor
    • Foundress associations
    • Pogonomyrmex californicus
    • Response threshold model

    ASJC Scopus subject areas

    • Animal Science and Zoology
    • Ecology
    • Behavioral Neuroscience

    Cite this

    Influence of the social context on division of labor in ant foundress associations. / Jeanson, Raphaël; Fewell, Jennifer.

    In: Behavioral Ecology, Vol. 19, No. 3, 2008, p. 567-574.

    Research output: Contribution to journalArticle

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