Title page for ETD etd-01082004-180058


Type of Document Dissertation
Author Whitaker, Darroch M.
Author's Email Address dwhitake@vt.edu
URN etd-01082004-180058
Title Ruffed grouse (Bonasa umbellus) habitat ecology in the central and southern Appalachians
Degree PhD
Department Fisheries and Wildlife Sciences
Advisory Committee
Advisor Name Title
Stauffer, Dean F. Committee Chair
Haas, Carola A. Committee Member
Kirkpatrick, Roy L. Committee Member
Norman, Gary W. Committee Member
Oderwald, Richard G. Committee Member
Walters, Jeffery R. Committee Member
Keywords
  • habitat ecology
  • forest management
  • Appalachian Mountains
  • radiotelemetry
  • Bonasa umbellus
  • Ruffed Grouse
Date of Defense 2003-12-15
Availability unrestricted
Abstract
Ruffed grouse populations are low in Appalachian forests, possibly because low habitat quality negatively affects survival, condition, and reproduction. Through the Appalachian Cooperative Grouse Research Project (ACGRP) researchers tracked >1500 radioed grouse at 10 study sites (1996–2002). To improve our understanding of Appalachian grouse habitat ecology, I carried out two primary analyses of this database. First, grouse should be under selective pressure to minimize movements, so I studied factors associated with variation in home range size. Second, importance of a habitat is affected by an individual’s resource needs, and I investigated factors associated with variation in selection of “preferred” habitats. Both approaches yielded important insights into the species’ regional habitat ecology.

As elsewhere, clearcuts, which afford escape cover, formed the cornerstone of grouse habitat in the region. However, a number of other factors were also important. At the root of this was a divergence in habitat ecology between grouse inhabiting the two major forest types in the region. In oak-hickory forests nutritional constraint strongly influenced habitat use. Grouse home ranges increased 2.5´ following poor hard mast crops, and at these times grouse increased use of alternate foraging habitats. Grouse, especially females and broods, made extensive use of mesic bottomlands and forest edges, which in oak-hickory forests support relatively abundant soft mast and herbaceous forages. In contrast, grouse inhabiting mixed mesophytic forests were insensitive to hard mast, did not select bottomlands, reduced use of forest edges, and increased use of clearcuts. I feel that greater abundance of birch, cherry, and aspen, buds of which are a high quality winter food, relieves nutritional stress on grouse inhabiting mesophytic forests. A general inference was that grouse attempted to balance competing strategies of maximizing either survival or condition, and the expression of this tradeoff was mediated by forest composition.

Also presented here were studies of radiotelemetry error, roost site selection, and suitability of prescribed burning as a habitat improvement technique. In the closing chapter I make recommendations for managing Appalachian forests for grouse, which focus on improving winter foraging habitat, brood habitat, and escape cover, all of which are limiting in Appalachian forests.

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