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Authors: Hagan J.M.¹; Meehan A.L.²

Source: Forest Science, Volume 48, Number 2, 1 May 2002 , pp. 231-242(12)

Abstract:

We evaluated the effectiveness of habitat variables derived at two spatial scales for explaining the presence or absence of 20 bird species at 363 point count stations in an extensive industrial forest in Maine. Sixteen stand-level (microhabitat) and seven landscape-level (within 1 km radius, or 3.14 km²) variables were used in stepwise logistic regression models to evaluate the relative roles of these two spatial scales for explaining each species' occurrence at a point count station. Species were classified as either early-successional (n = 6) or late-successional (n = 14) species for analysis. Three regressions were run for each of the 20 species: (1) stand variable only, (2) landscape variable only, and (3) stand and landscape variables combined. Regression models that included only stand-level variables averaged significantly higher model concordance scores than regression models that included only landscape variables. For 17 of 20 species, regressions that included only stand-level variables better explained the presence or absence of a species at a point than did regression that included only landscape-level variables. The presence of two species was better explained by landscape variables, and the presence of one species could not be explained by either stand- or landscape-level variables. Because many variables were positively associated with presence of some species and negatively associated with other species, management for particular stand- or landscape-level features must be preceded by a determination of which species are more important to conserve. FOR. SCI. 48(2):231–242.

Keywords: Avian; forestry; landscape; microhabitat; habitat loss; fragmentation; wildlife; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resources; natural resource management

Document Type: Miscellaneous

Affiliations: 1: Senior Scientist Manomet Center for Conservation Sciences, 14 Maine Street, Suite 404, Brunswick, Maine, 04011, Phone: (207) 721-9040; Fax: (207) 721-9144 jmhagan@ime.net 2: Biologist Maine Department of Inland Fisheries and Wildlife, 650 State St., Bangor, Maine, 04401, Phone: (207) 941-4483 amy.Meehan@state.me.us