Olson, K. R.; Jones, R. L.; Lang, J. M.
University of Illinois at Urbana-Champaign, Dept. of Natural Resources and Environmental Sciences, W-401c, N–407, and N-405 Turner Hall, 1102 S. Goodwin Ave., University of Illinois, Urbana, IL 61801.
Dr. Olson is corresponding author. E-mail: [email protected]
Received Feb. 3, 2004; accepted May 4, 2004.