Abstract
Intraspecific differences in the dispersal propensity of animals have been linked to interindividual variation in inherent tendencies (i.e., personality or behavioral type) that influence multiple aspects of an individual’s behavior. Studies linking dispersal propensity and personality often (1) focus on defining behavioral tendencies with a single behavioral trait rather than multiple, (2) do not recognize that invertebrates may have behavioral tendencies that influence dispersal, and (3) do not consider how the behavioral type of other individuals affects the dispersal propensity of an individual. We documented multiple foraging behaviors of an aquatic predatory insect (Notonecta irrorata) and found that Notonecta individuals differ in their inherent behavioral tendency (i.e., degree of boldness); all foraging behaviors were correlated such that riskier behaviors were exhibited by the same individuals. We conducted an experiment in which we varied which behavioral types of Notonecta were placed in outdoor pools (passive, bold or both types present) and quantified how long it took for individuals to disperse. Passive and bold individuals had a similar propensity to disperse but the dispersal propensity of each behavioral type was influenced by the behavioral type of other conspecifics present in the pool. Our work reveals that (1) invertebrates have inherent behavioral tendencies that vary among individuals but these tendencies do not necessarily impact all of the behavior displayed by the individual (i.e., impact foraging but not dispersal) and (2) the inherent behavioral tendency of other individuals with which an animal co-occurs can affect habitat patch dynamics such as predation, competition, or colonization.
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Acknowledgements
We would like to thank AJK’s thesis committee, Drs. Susan McRae and Heather Vance-Chalcraft, for valuable comments that improved this study. We also thank Samantha Kitchen, née Parrish, for helping with collection of organisms, set up of experiments, and comments.
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AJK and DRC conceived and designed the study, AJK conducted the experiments, AJK and DRC analysed the data, AJK and DRC wrote the manuscript.
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Communicated by Jill Lancaster.
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Kitchen, A.J., Chalcraft, D.R. An individual’s propensity to disperse is dependent on the behavioral type of its peers but not its own behavioral type. Oecologia 194, 403–413 (2020). https://doi.org/10.1007/s00442-020-04769-8
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DOI: https://doi.org/10.1007/s00442-020-04769-8