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As part of cooperative efforts among state and federal agencies in the preparation for response to an avian influenza virus H5N1 outbreak in North America, we conducted aerial surveys during May and June, 2007, to investigate the chronology, distribution and areas of aggregation, and species of waterfowl present in Wrangell-St. Elias National Park and Preserve (the Park). Surveys were flown along transects spaced at 2-mile intervals throughout probable waterfowl habitat within the Park and were replicated in three consecutive weeks between 24 May and 13 June. Estimates of waterfowl abundance in the Park declined from a high of 25,115.8 (SE = 4,096.9) in week 1 to 15,159.2 (SE = 2,973.8) in week 2 to 13,762.5 (SE...
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Relatively little is known about Arctic Warblers (Phylloscopus borealis) that breed in central Alaska. We monitored Arctic Warbler populations in two adjacent but distinct habitat types in central Alaska (high elevation, ?open shrub? and lower elevation, ?dense shrub?). We collected 95 nests over three breeding seasons to learn more about nest-building behavior, nest mass, composition, fledging success, and nest parasites. Females were the sole builders of ground nests, which were primarily comprised of moss, grass, and a lining of moose (Alces alces) hair. Dry weight of nests was ?20Â g, but differed up to ?3-fold within each habitat type each season. Nests from open shrub habitats were more massive and contained...
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Relatively little is known about Arctic Warblers (Phylloscopus borealis) that breed in central Alaska. We monitored Arctic Warbler populations in two adjacent but distinct habitat types in central Alaska (high elevation, ?open shrub? and lower elevation, ?dense shrub?). We collected 95 nests over three breeding seasons to learn more about nest-building behavior, nest mass, composition, fledging success, and nest parasites. Females were the sole builders of ground nests, which were primarily comprised of moss, grass, and a lining of moose (Alces alces) hair. Dry weight of nests was ?20Â g, but differed up to ?3-fold within each habitat type each season. Nests from open shrub habitats were more massive and contained...
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