Abstract
Aggression is a context-dependent behavior that often represents an adaptive trade-off with other energetically demanding phenotypes. Diseases can impose strong selection pressures on an organism, impacting the expression of aggression if the behavior is physiologically or genetically linked to disease resistance traits. However, aggression is also often a “sickness behavior” modulated directly by infection to conserve energy. Here we examine the cause-effect relationships between aggression and infection in the honey bee (Apis mellifera), a species with a heavy disease burden in which aggression has been correlated with diverse positive health outcomes. We induced infection in individual worker bees that differ in baseline aggression levels as a function of their colony-of-origin. We evaluated whether baseline aggression alters the response to infection, including the expression of disease-resistance behaviors and immune genes (defensin-1, hymenoptaecin, and vitellogenin). We found limited impact of baseline aggression on immune gene expression and the behavioral response to infection, but showed that infection can cause a change in aggression, at least in some cases. Though we cannot rule out the idea that high aggression is protective against infection, we find greater support for the idea that low aggression may be an energy-conserving “sickness behavior.” Future work concerning the evolutionary ecology of aggression and disease resistance in honey bees should consider the bidirectional relationship between these phenotypes, as well as the range of possible genetic and physiological mechanisms that connect them.
Significance statement
Genetic and physiological relationships between disease resistance traits and other behavioral phenotypes like aggression may impact how both traits are expressed in a particular ecological context, and ultimately, how these traits evolve. These relationships are particularly complex in social species, where social interactions both modulate aggressive behaviors and are involved in the response to infection. In honey bees, where pathogen loads and other stressors are prevalent, high aggression predicts health resilience. Here we show that high aggression co-occurs with some behavioral traits that improve the outcome of infection like grooming behaviors. Infection also causes a change in immune function and to an extent aggression, suggesting low aggression that is to some degree an energy conservation measure in sick honey bees.
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We thank Seth Biedenbender for help setting up behavioral experiments.
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This work is supported by the National Institute of Food and Agriculture, US Department of Agriculture Hatch Program under accession number 1012993, the Foundation for Food and Agriculture Research Pollinator Health Fund (Grant ID: 549049), the Kentucky Science and Engineering Foundation (3489-RDE-019), and the University of Kentucky Bucks for Brains Summer Research Program.
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Carr, H.M., Palmer, J.H. & Rittschof, C.C. Honey bee aggression: evaluating causal links to disease-resistance traits and infection. Behav Ecol Sociobiol 74, 108 (2020). https://doi.org/10.1007/s00265-020-02887-0
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DOI: https://doi.org/10.1007/s00265-020-02887-0