Abstract
Nest-site selection can be an important preemptive defense strategy for songbirds to reduce the risk of predation and is likely most effective when it incorporates both public and private information about predation. We examined the degree to which two songbirds, the Northern Cardinal (Cardinalis cardinalis, n = 160 pairs) and the Acadian Flycatcher (Empidonax virescens, n = 70 pairs), changed nest-site attributes (e.g., nest height, nest concealment, and vegetation density surrounding the nests) between subsequent within-season nesting attempts from 2006 to 2010 in Ohio. Specifically, we asked if birds adjusted nest-sites based upon information such as prior experience with nest predation, predator abundance, and predation risk. We predicted that, in cases where previous nests failed (private information) and/or sites had a greater risk of nest predation (public information), birds would make greater changes in nest characteristics such as nest height, concealment, and the vegetation density surrounding the nest to make presumably safer nest sites. Only cardinals, not flycatchers, showed evidence of using private and public information in changing nest-site attributes. There were greater changes in nest height when previous nests failed, and greater changes in nest concealment at riskier sites compared to those with low daily predation rates. These findings suggest that species differ in behavioral plasticity and use of information in ways that can both reflect and predict their ability to adapt to novel conditions.
Zusammenfassung
Verwendung von öffentlichen und nicht-öffentlichen Informationen zum Prädationsrisiko zur Nistplatzwahl innerhalb einer Brutsaison
Nistplatzwahl kann eine wichtige vorbeugende Strategie für Singvögel sein, um das Prädationsrisiko zu reduzieren und ist wahrscheinlich am effektivsten, wenn dazu sowohl öffentliche als auch nicht-öffentliche Informationen über Prädation berücksichtigt werden. Wir untersuchten, in welchem Maß zwei Singvogelarten, der Rotkardinal (Cardinalis cardinalis, n = 160 Paare) und der Buchentyrann (Empidonax virescens, n = 70 Paare), verschiedene Parameter in ihrer Nistplatzwahl (z. B. Nesthöhe, Sichtbarkeit des Nests und Vegetationsdichte im Umfeld des Nests) zwischen verschiedenen Brutversuchen innerhalb einer Saison zwischen 2006 und 2010 in Ohio änderten. Insbesondere untersuchten wir, ob die Vögel ihre Nistplätze anhand von Informationen wie frühere Erfahrung mit Prädation, Abundanz von Prädatoren und Prädationsrisiko anpassten. Wir sagten voraus, dass in Fällen, in denen eine Brut aufgrund von Prädation scheiterte (nicht-öffentliche Information) und/oder ein Ort ein größeres Prädationsrisiko hatte (öffentliche Information), die Vögel größere Änderungen in den Parametern ihrer Nistplätze zeigten, wie Nesthöhe, Sichtbarkeit des Nests und die Vegetationsdichte im Umfeld des Nests, um mutmaßlich sicherere Nistplätze zu erreichen. Nur der Rotkardinal, nicht aber der Buchentyrann, zeigte Hinweise auf die Verwendung von nicht-öffentlichen und öffentlichen Informationen für eine Veränderung der Parameter in der Nistplatzwahl. Es gab größere Änderungen in der Nesthöhe, wenn frühere Bruten misslangen und größere Änderungen in der Sichtbarkeit des Nests an risikoreicheren Orten im Vergleich mit solchen mit niedriger täglicher Prädationsrate. Diese Feststellungen deuten darauf hin, dass Arten sich in einer Art und Weise in der Plastizität ihres Verhaltens und dem Gebrauch von Informationen unterscheiden, die ihre Fähigkeit zur Anpassung an neue Bedingungen sowohl widerspiegeln als auch voraussagen kann.
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Acknowledgments
Funding for this research was provided by NSF DEB-0340879 and DEB-0639429 to A. D. Rodewald, Ohio Division of Wildlife and U.S. Fish and Wildlife Service through the State Wildlife Grant program, and the Ohio Agricultural Research and Development Center. We are grateful for the dedication and hard work of I. Ausprey, T. Jones, D. Narango, S. Rose, D. Shustack, and J. Smith-Castro with this research. We also appreciate the work of many other students, field assistants, and volunteers that have contributed to this project. Franklin County Metro Parks, Columbus Recreation and Parks, Ohio Division of Wildlife, Gahanna Parks and Recreation, Kenneth and Rosemary Caldwell, and the Ohio Wesleyan University generously granted permission to use their lands as sites. We thank A. Janke, S. Matthews, C. Whelan, and one anonymous reviewer for their helpful comments and suggestions. This study was conducted using protocol approved by the Institutional Animal Care and Use Committee at Ohio State University and within the laws established by the United States of America.
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Kearns, L.J., Rodewald, A.D. Within-season use of public and private information on predation risk in nest-site selection. J Ornithol 154, 163–172 (2013). https://doi.org/10.1007/s10336-012-0882-7
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DOI: https://doi.org/10.1007/s10336-012-0882-7