Abstract
Predation influences the ecology and behaviour of prey species and it is well known that the risk of predation affects prey’s decision making. We investigated whether predation risk through moon phase and exposure to the faecal odour of a natural predator, the red fox Vulpes vulpes, affect feeding behaviour and physiological response in wood mice (Apodemus sylvaticus). Antipredatory response was studied by live trapping under new and full moon in odourless control areas and areas experimentally manipulated with red fox fresh faeces. Food intake by individuals was determined as the amount of bait remaining in each trap and the physiological response was measured non-invasively analysing faecal corticosterone metabolites (FCM). Traps treated with faeces of red fox were the most avoided, and this avoidance was more significant during full moon. Food intake by wood mice varied according to the moon phase being significantly lower under full moon nights. We found sex, breeding condition and weight of individuals explaining the variation found in FCM concentrations, but no changes in FCM levels due to moon phase or exposure to red fox faeces were detected. These results indicate that wood mice avoid red fox faecal odour and this antipredatory response as well as feeding behaviour are significantly influenced by moon phase. However, no physiological response was found due to predation risk suggesting that wood mice do not take these predation cues enough reliable to experience physiological changes.
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Acknowledgments
The authors wish to thank the Comunidad Autónoma of Madrid (Spain) for providing the permits required to conduct this study. We are grateful to Itziar Cabrero for her help in the field, to Cañada Real Open Center, especially to José España, for supplying the red fox faecal material needed to carry out the experiments. We thank Rupert Palme for performing the EIA in the Biochemistry lab at the Vetmeduni Vienna and for his generous revision of this manuscript and making useful comments to improve it. We would also like to thank Edith Klobetz-Rassam and Nino Arias for excellent help with the laboratory analysis. In addition, we would like to thank Dr. Vincenzo Penteriani and an anonymous referee for their useful comments and suggestions to improve this manuscript. Á. Navarro-Castilla was supported by a FPU scholarship from the Ministerio de Educación y Ciencia of Spain.
Ethical standards
In this research, we fulfilled all the regulations concerning to handling and treatment of animals in accordance with the European Communities Council Directives of 24 November 1986 (86/609/EEC) for animal experiments. Manipulations of animals were done under the permit of the Comunidad Autónoma de Madrid (Spain) reference number 10/422505.
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Navarro-Castilla, Á., Barja, I. Does predation risk, through moon phase and predator cues, modulate food intake, antipredatory and physiological responses in wood mice (Apodemus sylvaticus)?. Behav Ecol Sociobiol 68, 1505–1512 (2014). https://doi.org/10.1007/s00265-014-1759-y
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DOI: https://doi.org/10.1007/s00265-014-1759-y