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1 September 2014 Occurrence of western scrub-jays (Aphelocoma californica) near forest edges in fragmented golden-cheeked warbler (Setophaga chrysoparia) habitat
Jessica A. Klassen, Heather A. Mathewson
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Abstract

The western scrub-jay (Aphelocoma californica) is a common nest predator and has been documented depredating nests of the federally endangered golden-cheeked warbler (Setophaga chrysoparia), a woodland songbird, in central Texas. We conducted opportunistic and transect surveys for western scrub-jays across two vegetation classes (woodland and shrub-scrub) to investigate the proximity of scrub-jays to golden-cheeked warblers breeding in a fragmented landscape. We used a chi-square test to compare the number of observed and expected scrub-jay detections for each vegetation class. To investigate if scrub-jays are an edge-occupying species, we compared the distance to nearest vegetation edge of actual scrub-jay detections to a null distribution of mean random distances. We found that scrub-jays occur in areas closer to vegetation class boundaries but do not appear to prefer one vegetation type over the other. Our findings suggest that golden-cheeked warblers may have higher nest predation risk in fragmented areas of their breeding range.

Jessica A. Klassen and Heather A. Mathewson "Occurrence of western scrub-jays (Aphelocoma californica) near forest edges in fragmented golden-cheeked warbler (Setophaga chrysoparia) habitat," The Southwestern Naturalist 59(3), 399-403, (1 September 2014). https://doi.org/10.1894/MCG-05.1
Received: 28 July 2013; Accepted: 1 April 2014; Published: 1 September 2014
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