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Social isolation causes mortality by disrupting energy homeostasis in ants

Koto, Akiko ; Mersch, Danielle ; Hollis, Brian ; Keller, Laurent

In: Behavioral Ecology and Sociobiology, 2015, vol. 69, no. 4, p. 583-591

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    Titre
    • Social isolation causes mortality by disrupting energy homeostasis in ants
    Auteur
    • Koto, Akiko. Department of Ecology and Evolution, Quartier UNIL-Sorge, Batiment Biophore, University of Lausanne, 1015, Lausanne, Switzerland
    • Mersch, Danielle. Department of Ecology and Evolution, Quartier UNIL-Sorge, Batiment Biophore, University of Lausanne, 1015, Lausanne, Switzerland
    • Hollis, Brian. Department of Ecology and Evolution, Quartier UNIL-Sorge, Batiment Biophore, University of Lausanne, 1015, Lausanne, Switzerland
    • Keller, Laurent. Department of Ecology and Evolution, Quartier UNIL-Sorge, Batiment Biophore, University of Lausanne, 1015, Lausanne, Switzerland
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Behavioral Ecology and Sociobiology, 2015, vol. 69, no. 4, p. 583-591. Springer Berlin Heidelberg
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:331639
    Summary
    Social deprivation can have negative effects on the lives of social animals, including humans, yet little is known about the mechanisms by which social withdrawal affects animal health. Here we show that in the carpenter ant Camponotus fellah, socially isolated workers have a greatly reduced life span relative to ants kept in groups of ten individuals. By using a new tracking system, we found that social isolation resulted in important behavioral changes and greatly increased locomotor activity. The higher activity of single ants and their increased propensity to leave the nest to move along the walls suggested that the increased mortality of isolated ants might stem from an imbalance of energy income and expenditure. This view was supported by the finding that while isolated ants ingested the same amount of food as grouped ants, they retained food in the crop, hence preventing its use as an energy source. Moreover, the difference in life span between single and grouped individuals vanished when ants were not fed. This study thus underlines the role of social interactions as key regulators of energy balance, which ultimately affects aging and health in a highly social organism.