Type of Document Dissertation Author Kasbohm, John W. URN etd-10022007-145359 Title Response of black bears to gypsy moth infestation in Shenandoah National Park, Virginia Degree PhD Department Fisheries and Wildlife Sciences Advisory Committee
Advisor Name Title Vaughan, Michael R. Committee Chair Kirkpatrick, Roy L. Committee Member Scanlon, Patrick F. Committee Member Stauffer, Dean F. Committee Member Voshell, J. Reese Jr. Committee Member Keywords
- Gypsy moth
Date of Defense 1994-03-05 Availability restricted AbstractThe effects of gypsy moth infestation on the Shenandoah National Park (SNP) black
bear population and habitat were studied during 1985 - 1991 by comparing radio
telemetry, population, and behavioral data from preinfestation years (1982 - 1986) and
years with extensive defoliation (1987 - 1991). Gypsy moth defoliation (> 60% canopy
loss) increased from 546 ha in 1986 (1 % of the study area), to 2,304 ha in 1987 (4%),
6,227 ha in 1988 (12%), and 17,736 ha in 1989 (34%). Chestnut oak and red oak habitat
types received the greatest defoliation; 60% and 45% of these habitat types suffered
greater than 60 % canopy loss in the North and Central Districts, respectively. Infestation
resulted in a 99% reduction in acorn production in defoliated stands. Maximum daily
temperatures 0.5 m above the ground in defoliated stands averaged 4.7 ± 0.3 C, 4.3 ±
0.4 C, and 2.5 ± 0.3 C warmer (P < 0.01) than in nondefoliated stands during peak
defoliation, refoliation, and post-refoliation periods, respectively.
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