Master of Science, The Ohio State University, 2025, Environment and Natural Resources
Ruffed grouse (Bonasa umbellus) populations in Ohio have experienced a precipitous decline since the 1980s, attributed to the loss of early successional habitats, forest maturation, and additional pressures such as West Nile Virus (WNV). This study evaluates the current state of ruffed grouse habitat in southeastern Ohio through a multi-scale approach that integrates presence-only species distribution modeling, field habitat assessments, and predictive analyses of forest management practices. The species distribution model, based on forest type, stand age, and forest loss data, identified areas with a high probability of grouse presence, primarily on state and federally managed lands. Key predictors of grouse presence included young forest stands (5–15 years old), particularly those with oak-hickory (Quercus spp.–Carya spp.) overstories, dense understories of red maple (Acer rubrum), greenbrier (Smilax spp.), and brambles (Rubus spp.), as well as steep, southeast- or east-facing slopes.
Field assessments conducted at Zaleski State Forest, Vinton State Forest, and Waterloo Wildlife Area confirmed the critical role of specific habitat features, including high stem densities, abundant forage, and downed woody debris, in supporting grouse populations. These areas demonstrated varying habitat qualities, with Zaleski offering the highest forage availability and Vinton showing the densest tree stands. Habitat suitability indices (HSI) derived from these assessments were further analyzed using the Forest Vegetation Simulator (FVS) to evaluate the impacts of different silvicultural treatments, including clearcutting, shelterwood cuts, and group selection. The results underscored the importance of active forest management in maintaining and enhancing high-quality habitat conditions for ruffed grouse.
This study highlights the importance of targeted conservation strategies to sustain Ohio's ruffed grouse populations. Recommendations include the implementation of rotational s (open full item for complete abstract)
Committee: Chris Tonra (Committee Member); Stephen Matthews (Committee Member); Robert Gates (Advisor)
Subjects: Animal Sciences; Animals; Biology; Ecology; Environmental Science; Forestry; Natural Resource Management; Wildlife Conservation; Wildlife Management; Zoology