Abstract
Non-direct effects of predation can be an important component of the total effect of predation, modulating animal population and community dynamics. The isolated effects of predation risk on the spatial organisation of the breeding bird community, however, remains poorly studied. We investigated whether an experimentally increased predation risk prior to reproduction affected breeding territory selection and subsequent reproductive strategies in three Mediterranean cavity-nesting birds, i.e., the little owl Athene noctua, European roller Coracias garrulus and scops owl Otus scops. We found that territories used the previous year were more likely to be re-occupied when they belonged to the safe treatment rather than to the risky treatment. The first choice of breeders of all three species was for safe territories over risky ones. When all breeding attempts in the season (i.e., final occupation) were considered, breeders also preferred safe to risky sites. In addition, little owls laid larger eggs in risky territories than in safe territories. Our study provides experimental evidence of a rapid preventive response of the three most abundant species in a cavity-nesting bird community to a short-term manipulation of predation risk. This response highlights the key role of the non-direct effects of predation in modulating avian community organisation.
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Acknowledgments
We would like to thank Esa Lehikoinen and Jukka T. Forsman for their constructive suggestions to the manuscript. This study was funded by the Spanish Ministry of Education and Science/FEDER (CGL2008-00718). Authorisation for carrying out the experiments was granted by Consejería de Medio Ambiente, Junta de Andalucía.
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Communicated by Esa Lehikoinen.
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Parejo, D., Avilés, J.M. Predation risk determines breeding territory choice in a Mediterranean cavity-nesting bird community. Oecologia 165, 185–191 (2011). https://doi.org/10.1007/s00442-010-1723-0
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DOI: https://doi.org/10.1007/s00442-010-1723-0