Nest-site selection, nest survival, productivity, and survival of Spruce Grouse in Wisconsin

• Published in: The Wilson journal of ornithology Vol. 125; no. 3; pp. 570 - 582
• Main Authors: Anich, Nicholas M., Worland, Mike, Martin, Karl J.
• Format: Journal Article
• Language: English
• Published: Fort Collins The Wilson Ornithological Society 01.09.2013; Wilson Ornithological Society
• Subjects: Animal behavior; Animal nesting; Behavior; Bird nesting; Birds; black spruce; Climate change; concealment; Conifers; Environmental aspects; Falcipennis canadensis; Female animals; Females; Grouse; Habitats; Hens; jack pine; MAJOR ARTICLES; Nest building; nest survival; nest-site selection; Nesting sites; Spruce Grouse; survival; Swamps; Vegetation; Young animals; Great Lakes region; Ontario; Wisconsin; Michigan; United States; Minnesota
• ISSN: 1559-4491; 1938-5447
• DOI: 10.1676/12-168.1

Spruce Grouse (Falcipennis canadensis) are listed as threatened in Wisconsin, and the boreal habitats in which they occur are likely to be threatened by changing climatic conditions. However, the limited information available on Spruce Grouse in the Upper Great Lakes region makes it unclear which habitat features are important for Spruce Grouse nesting in Wisconsin. We radiotracked 30 female Spruce Grouse in northern Wisconsin from 2007–2012 and located 25 nests. Eighteen of 25 nests were beneath black spruce (Picea mariana) trees. Only three nests were in upland, and only one in a stand of jack pines (Pinus banksiana), in contrast to studies from Michigan and Ontario. Overall concealment was a good predictor of nest sites for Spruce Grouse, but not a good predictor of nest survival. Nest survival was associated with moderately dense and uniform 0–0.5 m lateral vegetation cover. Seventeen of 25 nests were successful, with a daily survival rate of 0.985, overall productivity of 1.0 young/female, and 1.9 young/successful nest. Annual survival of adult males was estimated at 54%, adult females at 40%, and juvenile survival at 14% and 24% by two different methods. Estimates of λ of 0.65 and 0.67 suggest a declining population, but the upper confidence limit exceeds 1, not ruling out a stable or slightly increasing population. Protecting black spruce swamps will protect important nesting habitat for Spruce Grouse in Wisconsin.