1. LTER Network Office, Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131-1091;
2. Program in Ecology and Conservation Biology, Department of Biological Sciences & The Museum, Texas Tech University, Lubbock, Texas 79409-3131;
3. Kellogg Biological Station and the Department of Zoology, Michigan State University, Hickory Corners, Michigan 49060;
4. Department of Biological Sciences, University of Alabama, Tuscaloosa, Alabama 35487-0344;