Abstract
Which task a social insect worker engages in is influenced by the worker’s age, genotype and the colony’s needs. In the honeybee, Apis mellifera, genotype influences both the age a worker switches tasks and its propensity of engaging in specialist tasks, such as water collecting, which only some workers will perform. In this study, we used colonies with natural levels of genetic diversity and manipulated colony age demography to drastically increase the stimuli for the generalist tasks of foraging and nursing, which all workers are thought to engage in at some point in their lives. We examined the representation of worker patrilines engaged in nursing and foraging before and after the perturbation. The representation of patrilines among foragers and nurses differed from that of their overall colony’s population. In the case of foraging, over- and underrepresentation of some patrilines was not simply due to differences in rates of development among patrilines. We show that replacement foragers tend to be drawn from patrilines that were overrepresented among foragers before the perturbation, suggesting that there is a genetic component to the tendency to engage in foraging. In contrast, the representation of patrilines in replacement nurses differed from that in the unperturbed nursing population. Our results show that there is a genetic influence on even the generalist tasks of foraging and nursing, and that the way patrilines in genetically diverse colonies respond to increases in task stimuli depends upon the task. The possible significance of this genetic influence on task allocation is discussed.
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Acknowledgements
We thank Michael Duncan and Julie Lim for technical assistance and members of the Behaviour and Genetics of Social Insects Laboratory at the University of Sydney for comments on earlier versions of the manuscript. We also thank R. E. Page and three anonymous reviewers for their comments and suggestions that greatly improved the manuscript. Funding was provided by a Marie Curie Outgoing International Fellowship within the 6th European Community Framework Programme (W.O.H.H.) and by the Australian Research Council (B.P.O.). The experiments were performed in accordance with the rules and regulations of Australia.
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Chapman, N.C., Oldroyd, B.P. & Hughes, W.O.H. Differential responses of honeybee (Apis mellifera) patrilines to changes in stimuli for the generalist tasks of nursing and foraging. Behav Ecol Sociobiol 61, 1185–1194 (2007). https://doi.org/10.1007/s00265-006-0348-0
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DOI: https://doi.org/10.1007/s00265-006-0348-0