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Table 2.5. Characteristics of pileated woodpecker cavity trees compared to characteristics of available trees at the site and stand scales, Alberta, 1993–98. Available treesa Cavity trees Site scale Stand scale n = 472 n = 1594 n = 939 Live deciduous trees Proportion Conclusionb Proportion Conclusionb Proportion Conclusionb Conks 0.597 Use > Ab 0.263 Use > Ab 0.179 Use > Ab Dead branch stubs 0.578 Use > Ab 0.232 Use > Ab 0.232 Use > Ab Stem cracks 0.220 Use > Ab 0.095 Use > Ab 0.102 Use > Ab Stem swelling 0.129 Use > Ab 0.022 Use > Ab 0.009 Use > Ab Stem crook 0.083 Use > Ab 0.017 Use > Ab 0.004 Use > Ab n = 139 n =199 n = 101 Dead trees Proportion Conclusionb Proportion Conclusionb Proportion Conclusionb Intact top (snag) 0.288 Use < Ab 0.558 Use < Ab 0.802 Use < Ab Broken top (stub) 0.712 Use > Ab 0.442 Use > Ab 0.198 Use > Ab <50% bark 0.676 Use > Ab 0.156 Use > Ab 0.099 Use > Ab 0.324 Use < Ab 0.839 Use < Ab 0.901 Use < Ab ≥50% bark Decay class 1–2 0.705 Use > Ab 0.467 Use > Ab 0.545 Use > Ab Decay class 3–4 0.295 Use < Ab 0.528 Use < Ab 0.455 Use < Ab a Includes only trees >29 cm dbh and >7m height; smaller and shorter trees were rarely used by pileated woodpeckers as cavity trees. b Use versus abundance comparisons, Bailey 95% confidence intervals.

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Pwp 2001 04 rpt phdthesis pileatedwoodpeckerhabitatecologyinabfoothills  

http://foothillsri.ca/sites/default/files/null/PWP_2001_04_Rpt_PhDThesis_PileatedWoodpeckerHabitatEcologyinABFoothills.pdf

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