Abstract
Because time spent in refuge may be costly if prey lose opportunities to forage, fight, or mate, prey allow predators to approach closer before beginning to flee when opportunity costs are high. Because the same opportunity costs may apply to refuge use as to escape, prey should make similar trade-offs between risk of emerging and cost of remaining in refuge. In the Iberian rock lizard, Lacerta monticola, we studied the effects of sex, reproductive season, speed of predator approach, and potential loss of mating opportunities on time spent in refuge following simulated predatory attacks. Lizards of both sexes adjusted refuge use to the level of risk by spending more time in refuge when approached rapidly than slowly. Females remained in refuge for equal times in the mating and postreproductive seasons, but males emerged sooner during the mating season, suggesting adjustment to a cost of lost opportunity to search for mates during the mating season. When a tethered female was nearby, males emerged from refuge earlier than if no female was present, indicating a trade-off between risk and mating opportunity. Approach speed affected emergence time when females were absent, but not when a female was present. Approach speed did not affect the probability that, after emerging, a male would return to court the female. For males that courted females intensely (bit them) before entering refuge, approach speed did not affect latency to emerge, but males that courted less intensely emerged sooner if approached slowly than rapidly. These findings show that males adjust the length of time spent in refuge to both risk of predation and reproductive cost of refuge use.
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Acknowledgements
We thank two anonymous reviewers for constructive and helpful comments, and "El Ventorrillo" MNCN Field Station for use of their facilities. Financial support was provided to J.M. and P.L. by the MCYT project BOS 2002-00547and to W.E.C. by an International Travel Grant from Purdue University. W.E.C. is grateful for logistical help by Valentín Pérez-Mellado. The experiments were performed under license from the Agencia del Medio Ambiente de la Comunidad de Madrid (Spain).
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Martín, J., López, P. & Cooper, W.E. Loss of mating opportunities influences refuge use in the Iberian rock lizard, Lacerta monticola . Behav Ecol Sociobiol 54, 505–510 (2003). https://doi.org/10.1007/s00265-003-0659-3
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DOI: https://doi.org/10.1007/s00265-003-0659-3