Abstract
Predators may select more often to attack the more vulnerable prey or those with an inferior health status. Thus, prey should be able to assess their own vulnerability to predation and modify their antipredatory behavior accordingly. When approached by predator skuas, unguarded penguin chicks flee short distances, and usually aggregate in dense packs, but there is a clear interindividual variability in their responses under similar conditions. We hypothesized that this variability in escape responses might be related to the perceived vulnerability to predation of each individual chick. We simulated predator attacks to chinstrap penguin chicks and analyzed the sources of variation in their escape response, such as the presence of adults or the density of other chicks, and the sex, age, body condition, and health status of responding chicks. Chicks allowed shorter approach distances when they had a better health condition (i.e., a greater T-cell-mediated immunity, CMI), when they were younger, and when the density of adults around was higher. Sex and density of other chicks were not important. Similarly, chicks fled from the experimenter to longer distances when they had a lower CMI and when the density of adults was lower. Therefore, escape characteristics of chicks depended on the presence of adults that can deter predators and on the health-dependent vulnerability of chicks.
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Acknowledgements
We thank JL Tella and JL Quinn for the helpful comments on the manuscript. This study was based on the Spanish Army Base “Gabriel de Castilla”; transport to and from Deception Island was provided by the Spanish Navy ship “Las Palmas”. We thank the cooperation offered by all participants in the Spanish Antarctic campaign 2002/2003 and especially to JC, the “man with long sideburns”, for his persistent companionship. Financial support was provided by the Spanish Antarctic Program, MCYT project BOS 2001-3170. The manipulations and experimental procedures were approved by the Scientific Committee for Antarctic Research (SCAR).
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Martín, J., de Neve, L., Polo, V. et al. Health-dependent vulnerability to predation affects escape responses of unguarded chinstrap penguin chicks. Behav Ecol Sociobiol 60, 778–784 (2006). https://doi.org/10.1007/s00265-006-0221-1
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DOI: https://doi.org/10.1007/s00265-006-0221-1