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1 March 2009 Characteristics of Foraging Perch-sites Used by Loggerhead Shrikes
Miles E. Becker, Peter A. Bednekoff, Michael W. Janis, Donald C. Ruthven
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Perch-sites are a necessary component of Loggerhead Shrike (Lanius ludovicianus) foraging habitat, yet little is known about the influence of perch characteristics on perch use. We hypothesized that Loggerhead Shrikes would selectively forage from taller, bare perches with less foliar obstruction to potentially increase prey detection rates. Shrikes in our study area foraged from trees ∼10% taller than those available and on dead or partially dead trees more often than expected (P = 0.005). Deciduous trees with a leafy canopy in summer were more likely to be used when bare in winter. Removing all obstacles to prey detection did not increase perch preference. Shrikes perched more often and for more total time on constructed artificial perches surrounded by dead branches (50% of used; 166 sec/territory) than on treatments with leafy branches (14%; 32 sec) or no branches (36%; 50 sec). Our results suggest trees that are more useful are those with a good view of potential prey and which also provide cover from potential attacks by predators. This study demonstrates the relevance of perch-site characteristics to Loggerhead Shrike foraging habitat and we suggest consideration for perch-site characteristics in future conservation efforts.

Miles E. Becker, Peter A. Bednekoff, Michael W. Janis, and Donald C. Ruthven "Characteristics of Foraging Perch-sites Used by Loggerhead Shrikes," The Wilson Journal of Ornithology 121(1), 104-111, (1 March 2009).
Received: 13 February 2008; Accepted: 1 August 2008; Published: 1 March 2009
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