Canadian Forest Service Publications

Changes in a forest bird community during an outbreak cycle of the spruce budworm in Northwestern Ontario. 2009. Holmes, S.B.; Sanders, C.J.; Fillman, D.; Welsh, D. A. Bird Populations 9: 13 - 28.

Year: 2009

Issued by: Great Lakes Forestry Centre

Catalog ID: 31482

Language: English

Availability: PDF (request by e-mail)

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We report here changes in the forest bird community of a 10.4 ha study plot located in boreal mixedwooJ forest of northern Ontario, Canada, between 1966 and 1998. During this period, the region was subject to a severe outbreak of the spruce budworm (Ckomtomura fumferana). Overall, community response to increasing Lmdworm prevalence was positive, although response pattern differed among species. All bird species that increased in population size did so during the increasing phase of the budworm cycle. By the time the budworm outbreak readied its peak in 1989-1990, both in terms of liudworm density and defoliation, bird numbers had already been declining for five or more years, suggesting that the advantages conferred by a superabundant food supply were offset by negative effects on habitat. Key wards', community composition, competition, forest birds, habitat, numerical response, spruce budworm outbreak.