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Permanent URI for this collectionhttps://hdl.handle.net/1969.6/86486
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Browsing publications by Author "Bildstein, Keith L."
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Item Naphthalene moth balls do not deter mammalian predators at red-winged blackbird nests.(Journal of Field Ornithology, 1988) Gawlik, Dale E.; Hostetler, Mark E.; Bildstein, Keith L.Researchers often use predator repellents to deter mammalian predators from following their scent trails to nests. The effectiveness of repellents is largely unstudied. We tested naphthalene moth balls, a supposed repellent, and found them to be ineffective in deterring mammalian predators at unoccupied Red-winged Blackbird (Agelaius phoeniceus) nests that we supplemented with Northern Bobwhite (Colinus virginianus) eggs.Item Reproductive success and nesting habitat of the loggerhead shrike in north-central South Carolina.(Wilson Bulletin, 1990) Gawlik, Dale E.; Bildstein, Keith L.Breeding Loggerhead Shrikes (Lank ludovicianus) were studied in the Piedmont physiographic region of north-central South Carolina during the breeding seasons of 1986 and 1987. Sixty-three percent of shrike nests were in red cedar (Juniperus virginiana). Shrikes nesting in red cedar fledged one more young per nest than did shrikes nesting in other trees. First nests were significantly lower and somewhat closer to the trunk of the nest tree than were second nests, suggesting that climatic effects during the nesting season affected nest placement. Within 100 m of shrike nests, short-grass habitats (e.g., pasture, hay fields, and residential lawns) predominated, comprising, on average, more than 80% of the area. Short vegetation around nests may result in increased prey availability. The relatively high reproductive success of Loggerhead Shrikes in this study is similar to that reported by researchers elsewhere, and it does not explain the recent decline in shrike populations in the region.Item Seasonal Habitat Use and Abundance of Loggerhead Shrikes in South Carolina(Journal of Wildlife Management, 1993) Gawlik, Dale E.; Bildstein, Keith L.Loss of winter habitat has been implicated in the widespread declines of loggerhead shrik ludovicianus) populations; however, our understanding of what represents winter habitat for this s poor. Thus, we investigated whether shrikes in South Carolina used similar habitats throughout the found that during the breeding season shrikes inhabited areas dominated by short, grassy vegetation outside of the breeding season, they decreased (P = 0.047) their use of grassy habitats and increased (0.005) their use of cropland. Declines in shrike populations in the southeastern United States as w entire nation, respectively, were correlated (r = 0.83, n = 15, P < 0.001; r = 0.34, n = 113, P < 0 a loss of pastureland suggesting that this habitat may be limiting. Our data suggest that manage resident shrikes in the southeastern United States should include a patchwork of short grassy h sparsely vegetated bare areas at the scale of individual shrike territories.