Abstract
Consistent individual differences in boldness have been identified in many species and can have important effects on fitness. In most animals, juveniles face different costs and benefits of risk-taking behavior than do adults. Furthermore, profound changes in hormones, morphology and environment often occur when juveniles become adults. Therefore, the boldness of individuals might change with ontogeny. In field crickets, adult males call to attract sexually receptive females, and male calling increases predation risk. We measured the repeatability of boldness (latency to emerge from a safe refuge) in both male and female crickets. Each cricket was tested once as a small nymph and once as an adult. We found that boldness was repeatable across metamorphosis in females, but not in males. Males became less bold with maturation, a result that we predicted because of the risk associated with calling for mates. We also found that in general, nymphs were bolder than adults and that individuals spent more time immobile in response to a predator cue when they were nymphs, versus when they were adults.
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Acknowledgements
Special thanks to L. Berger, A. Leonard, C. Szeto, M. Tam, and C. Young-Yin for their assistance in the laboratory and to Niels Dingemanse for discussion. This work was funded by the National Science Foundation (IBN-0076484; AH), and by the Academy of Finland (decisions 204837 and 127398; RK).
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Communicated by D. Gwynne
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Hedrick, A.V., Kortet, R. Sex differences in the repeatability of boldness over metamorphosis. Behav Ecol Sociobiol 66, 407–412 (2012). https://doi.org/10.1007/s00265-011-1286-z
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DOI: https://doi.org/10.1007/s00265-011-1286-z