Authors’ addresses: Margaret T. Shaw and Robert McGrail, Departments of Biology and Computer Science, Bard College, Annandale, NY 12504. Felicia Keesing, Department of Biology, Bard College, Annandale, NY 12504 and Institute of Ecosystem Studies, Millbrook, NY 12545. Richard S. Ostfeld, Institute of Ecosystem Studies, PO Box AB, 65 Sharon Turnpike, Millbrook, NY 12545, Telephone: 845-677-5343, Fax: 845-677-5976, E-mail:
Acknowledgments: This is a contribution to the program of the Institute of Ecosystem Studies.
Financial support: This research was funded by a Research Experiences for Undergraduates (REU) grant from the National Science Foundation (DBI-9988029) to the Institute of Ecosystem Studies in Millbrook, NY, a grant from the National Institutes of Health to Richard S. Ostfeld and Felicia Keesing (R01 AI-040076), and a grant from the National Science Foundation to Richard S. Ostfeld and C. D. Canham (DEB-0075277).
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