Abstract
1 National Program on Environmental Health ? Biodiversity, Agriculture and Agri-Food Canada, Central Experimental Farm, K. W. Neatby Bldg., 960 Carting Ave., Ottawa, Ontario, K1A 0C6 Canada, redheads@agr.gc.ca (author for correspondence). 2 Department of Biology, Duke University, Durham, NC 27708-0338, U.S.A. 3 Department of Ecology and Evolution, University of Lausanne, Biology Building, CH-1015 Lausanne, Switzerland. 4 Department of Natural History, Royal Ontario Museum, and Department of Botany, University of Toronto, Toronto, Ontario, M5S 2C6 Canada.
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