Abstract
The existence of personalities has been explored in various invertebrates, but a comprehensive investigation of personality differences across individuals in a eusocial insect has not yet been conducted. The study of personality differences across individuals within the same behavioral caste may contribute to an understanding of how social insects divide labor within the nest. Here, we define and investigate three dimensions of personality within the worker caste of a model social insect, the honey bee Apis mellifera, as follows: (1) consistent individual behavioral differences over time, (2) consistent individual behavioral differences across contexts, and (3) the presence of correlated suites of behaviors. To test whether honey bee workers exhibit dimensions 1 and 2, we repeatedly assessed responses of groups of same-age bees in cages to stimuli that are relevant to bee life history. To test for dimension 3, we examined behavior within a colony context by using observation hives to record the behaviors of individual bees across their lifetimes. Our results provide some evidence for all three dimensions of personality in honey bee workers. In particular, our data suggest some individuals may be more likely to be highly interactive with other workers (e.g., engaging in food sharing), while other individuals are consistently less interactive. These findings expand upon and contribute to previous models for the organization of worker division of labor in honey bees, suggesting that consistent behavioral differences (personalities) of workers within a behavioral caste have the potential to contribute to subcaste division of labor.
Significance statement
Behavioral ecologists have become increasingly interested in animal personalities, individual behavioral differences that are consistent over time and in different contexts, with recent focus on understanding the occurrence of personalities across taxa and their adaptive value. The existence and function of personality differences among individuals in complex societies, such as eusocial insects, remain understudied. Here, we provide the first comprehensive investigation of whether workers of the highly eusocial honey bee show hallmarks of personality. Although these workers demonstrate well-documented behavioral changes as they age, we uncovered some aspects of their behavior, in particular, their tendency to physically interact with other bees, remain somewhat consistent even as they age and change roles within the colony. We suggest that individual-level personality differences have the potential to contribute to colony division of labor by creating variation in individual tendencies to perform different tasks.
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Acknowledgments
We would like to thank the members of the Toth lab for the helpful suggestions on these experiments and feedback on the manuscript. We would like to thank Kate Hunter for the assistance with behavioral observations and Eric Gangloff for the guidance on statistical analyses.
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The authors declare that they have no conflict of interest.
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Communicated by O. Rueppell
This manuscript is a contribution to the special issue Integrative Analysis of Division of Labor—Guest Editors: Simon K. Robson, James F. A. Traniello.
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ESM 1
Supplemental Figure 1. Box-and-whisker plots of age polyethism of bees in observation hives. The pattern of behavioral transition observed in this study reflected patterns observed in previous studies (Seeley 1982; Winston 1987). Red represents interactive tasks and blue represents non-interactive tasks. (DOC 82 kb)
ESM 2
Supplemental Table 1. Spearman rank correlations of same behaviors performed within a context and different behaviors performed in different contexts. P-values are shown after a Benjamini-Hochberg correction. (DOC 36.5 kb)
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Walton, A., Toth, A.L. Variation in individual worker honey bee behavior shows hallmarks of personality. Behav Ecol Sociobiol 70, 999–1010 (2016). https://doi.org/10.1007/s00265-016-2084-4
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DOI: https://doi.org/10.1007/s00265-016-2084-4