Habitat selection and reproductive success of loggerhead shrikes in northwest missouri: a hierarchical approach
2001
ESELY Jr., JEFFREY D. | Bollinger, Eric K.
We studied the reproductive success and habitat selection of a migratory population of Loggerhead Shrikes (Lanius ludovicianus migrans) during the nesting season in northwest Missouri. The selection of breeding habitat was investigated at different spatial scales. Thirty-eight (67%%) of 57 nests were located in osage orange (Maclura pomifera) trees. Shrike territories (defined as the area ;le 200 m from the nest site) contained significantly more pasture, fenceline, and perch sites, but less corn, alfalfa, and forest than random sites. At larger spatial scales, more grassland was detected ;le300 m of shrike nests than random locations. However, no differences were detected between shrike nests and random sites when larger radii (600, 900, and 1500 m) were analyzed. Nest success (56%%) and productivity (3.63 young/successful pair) were similar to other North American means, and specific habitat variables appeared to have little association with nest success. However, nests located ;le15 m of roadways were significantly less successful (39%%) than interior nests (76%%).
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