Bird abundance in forests managed for timber and wildlife resources
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Bird abundances and species composition were compared in the western Sierra Nevada between 1983 and 1984, and between 1986 and 1987 in stands that were managed by even- and uneven-aged silvicultural systems (treatments) for both timber and wildlife resources. Residency status had no significant relationship with bird numbers between treatments. Of the 26 bird species analyzed, significant yearly variation in numbers was found for 10 species between 1983 and 1984 and six species between 1986 and 1987. Significant treatment effects were shown for 10 species during 1983 and 1984 and 10 species during 1986 and 1987; a tendency was found for higher numbers on uneven-aged stands. Maintenance of a somewhat natural mix of tree species may have reduced possible treatment effects on bird numbers. If managed for maintenance of high tree-species diversity and other wildlife needs, even- and uneven-aged stands may support similar bird communities. 1992.
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