Thompson Bishop el at. • SWAINSON'S WARBLER NESTING ECOLOGY 
735 
only is the fecundity of the population we studied 
comparable to studies in non-industrial forests, in 
many instances it surpasses those landscapes. 
Additional breeding populations need to be 
studied to assess the feasibility of the industrial 
forest as a management scenario for Swain son's 
Warblers. The principal impact we observed on 
Swainson’s Warbler productivity was Brown¬ 
headed Cowbird parasitism. The effects of 
parasitism on hatching and fledgling production 
should be considered a significant threat to this 
species. Cowbird abundance across the Swain- 
son's Warbler range should be monitored. 
AC KNOWLEDG M ENTS 
We thank the many field technicians and volunteers who 
assisted during the study, and recognize those who directly 
contributed to the nest observations for this manuscript: 
B. B Desjardins. L. C. Bruce. D. K. Bruce. S. C. Garriock. 
and J. C. Norwalk. K. A. Peters provided valuable 
instruction, support, and insight into studying Swainson's 
Warblers. Funding was provided by International Paper 
Co.. North Carolina Museum of Natural Sciences. National 
Audubon Society. North Carolina State University, and 
National Council for Air and Stream Improvement. Wc 
particularly thank S. E. DuBose and W. T. Smith at 
International Paper Co. for then support. Members of the 
Woodbury Hunt Club provided logistical and moral 
support, particularly L. E. Gunter, C. S. Easterling, and T. 
L. and C. A. Lewis. We thank the reviewers, T. J. Benson 
and G. R. Graves, and editor. C. E. Braun, for their critiques 
of this manuscript. 
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