1. College of the Atlantic, 105 Eden Street, Bar Harbor, ME 04609
2. Maine Natural History Observatory 317 Guzzle Rd., Gouldsboro, ME 04607
3. P.O. Box 571, Cape Neddick, ME 03902
4. Biological Sciences Department, California Polytechnic State University, San Luis Obispo, CA 93407and
5. Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa