Ministry of Forests

Cariboo Region Research Section

Bird Communities in Interior Douglas-fir Forests (IDFdk3) in the Cariboo Forest Region

Breeding bird communities were compared between stands resulting from three silvicultural systems (simulated shelterwood, single tree selection, low vloume single tree selection) and old, uneven aged Douglas-fir forest in the IDFdk3 biogeoclimatic unit within the Cariboo Forest Region.  Species composition and density shifted in response to type of silvicultural system.  Low volume selection silvicultural system used on mule deer winter range caused the leasrt change in the bird community while the simulated shelterwood (diameter limit haravesting) caused the most change.  Red-breasted nuthatches and golden-crowned kinglets declined significantlyu in response to all silvicultural systems and pileated woodpeckers and white-winged crossbills preferred old forests.  Many species increased in abundance due to the more open forest structure created by single tree selection and diameter limit harvesting.  Correlation analyses pointed to basal area of large trees.  Canopy Diversity Index, density of aspen, distance to water and amount of old forest as important variables in determining density of different bird species.  Douglas-fir stands adjacent to wetlands and lakes, and spruce and aspen stands have rich and abundant bird communities:  therefore, need to be maintained in the IDF landscape.  This study supports recommendations in the Biodiversity Guidebook (Forest Practices Code of British Columbia) for NDT4.

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