Title page for ETD etd-10022007-145359

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
  • Gypsy moth
Date of Defense 1994-03-05
Availability restricted
The 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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