Graduate Thesis Or Dissertation
 

Diurnal bird use of snags on clearcuts in central coastal Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/h415pc75c

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  • The effect of snag retention on clearcuts on breeding bird populations was evaluated in the Douglas-fir (Pseudotsuga menziesii) dominated forest in central coastal Oregon. Diurnal bird species on 14 clearcut sites (< 4 years old) were censused during two breeding seasons. On clearcuts containing high numbers of snags, cavity-nesting birds accounted for approximately 30% of total bird species richness and density. Six cavity-nesting species were commonly observed and can be expected to breed successfully on clearcuts if enough snags of the proper characteristics are provided. Non-cavity nesting bird species populations were unaffected by the presence of snags but they frequently used snags for perching and singing. Cavity-nesting bird species richness and density were positively correlated with increasing snag density. These correlations were even stronger when only large (> 10 ha) clearcuts, or only snags containing potential nest sites, were evaluated. Certain characteristics of snags increased their likelihood of being used as nest sites by cavity-nesting birds. Hard snags were preferred by virtually all species over soft snags. Cavity-nesting birds selected snags taller than 6.3 in. Snags with diameters between 78-102 cm received greater use and the presence of existing cavities increased the likelihood of subsequent use. Large numbers of unsuitable snags (< 3.4 in tall, < 28 cm diameter) provided few nest sites and will not meet the needs of cavity-nesting birds. Nest sites of all species of cavity-nesting birds displayed wide ranges in snag heights and diameters suggesting the need to provide an array of snag types on clearcuts.
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Déclaration de droits
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  • PDF derivative scanned at 300 ppi (256 B&W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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