期刊
CANADIAN JOURNAL OF FOREST RESEARCH
卷 44, 期 10, 页码 1265-1273出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjfr-2013-0534
关键词
Campephilus; fixed kernel estimator; optimum habitat; timber potential; vulnerable wildlife
类别
资金
- Idea Wild, Birders' Exchange
- Francois Vuilleumier Fund for Research on Neotropical Birds
- Manomet Observatory - Kathleen S. Anderson Award, and Sigma Xi Grants-in-Aid of Research (GIAR)
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET, Argentina)
The Magellanic Woodpecker (Campephilus magellanicus (King, 1827)) is a large, vulnerable species exhibiting geographic range retraction. We analyzed the size and location of forest areas used by these woodpeckers in consecutive years (2010-2012), as related to habitat characteristics, in an old-growth lenga (Nothofagus pumilio (Poepp et Endl.) Krasser) forest of Argentine Patagonia. Woodpeckers were tracked during the postbreeding season, and forest features were evaluated in plots within territories. Woodpecker density was 1.01 territories.100 ha(-1). The resident population apparently saturates the forest available in the study site; hence, territorial disputes were frequent between all pairs of adjacent families. Families used 39.3 +/- 13.6 ha during the postreproductive season and 63.2 +/- 12.3 ha across the three seasons, with interannual variability in both location and size of the areas used. Abundances of large live trees and of coarse woody debris were correlated with smaller, presumably high-quality, home ranges. Other forest attributes that are often important in woodpecker habitat (e. g., snag density) had little relationship with home-range size, but the high availability of resources in old-growth forests may mask their potential importance in a poorer quality habitat. Our results show that Magellanic Woodpecker family groups require a minimum of 100 ha in old-growth forest habitat; thus, forest patches in less favourable forest conditions (e. g., younger, managed, fragmented, mixed forests) should probably be much larger to support a resident pair or family. This habitat size would be a provisional minimum threshold to be used in management decisions involving the forests of Patagonia until alternative figures are derived from studies across multiple forest types.
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