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I examined use and selection of nest trees by six species of primary cavity-nesting birds in the interior Douglas-fir Biogeoclimatic Zone (IDF) near Kamloops, British Columbia. Analyses were based on 243 active nests located during 1984 and 1985. Presence of heartwood decay was the most important tree characteristic influencing selection of nest trees; all bird species strongly preferred trees bearing fruiting bodies of heartrot fungi. Most nests occurred in trembling aspen (Populus tremuloides) and paper birch (Betula papyifera). Douglas-fir (Pseudotsuga menziesii var. glauca) and hybrid spruce (Picea engelmannii x glauca) were not used for nesting, probably because their pattern of decay was unfavourable for cavity-nesting. However, dead conifers appeared to be importatn foraging substrates. In trembling aspen, infection with heartwood decay occurred in live trees, leaving a sound sapwood shell protecting nest holes excavated in the softened heartwood. Such trees were preferred by the stronger excators, Ye
Keisker, D.G.. 1987. Nest Tree Selection by Primary Cavity-nesting Birds in South-central British Columbia. Ministry of Environment and Parks. Wildlife Report. R13
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