"Botanists are more civilized than zoologists" - Humbled goose biologist, Akimiski Island, Nunavut Territory, 1998
Department of Biology|
University of Toronto Mississauga
Department of Ecology & Evolutionary Biology
University of Toronto
3359 Mississauga Road|
Mississauga, Ontario, L5L 1C6, Canada
Interests: I study ecological interactions between plants and their natural enemies (herbivores and pathogens). My recent research has centred on the effects of natural enemies on non-native species; ongoing projects focus on the question of whether escape from natural enemies promotes the survival and spread of exotic plants, and whether escape from enemies is more likely in marginal populations. Other research has included studies of seed ecology and of the effects of grazing by northern goose populations. Associate Editor, Ecology and Biological Invasions. Short curriculum vitae.
Graduate Student Opportunities
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|Canada Thistle||Invasive species as sources of natural enemies. Do invasive plants act as reservoirs for diseases, pathogens, and insects that can attack nearby native plants? The principal study site for this work has been the Koffler Scientific Reserve at Jokers Hill.||Jason Verbeek investigated this issue using the European invader Canada Thistle (Cirsium arvense) as a model system.|
|Common Burdock||Interactions between invaders and their natural enemies in marginal populations. Do invasive plants escape their enemies near their geographic range limits? We have investigated this along a transect from southern Ontario to as far north as Moosonee and Churchill.||Krystal Nunes investigated these and related issues with Canada Thistle (Cirsium arvense). Daz Kambo and Kelvin Lee worked on this problem, using Burdock (Arctium minus) as a model species.|
|Jokers Hill Forest||Experimental studies of the influence of pathogens and predators (including earthworms) on seed mortality. This work has involved studies of both old field plants and forest trees. The principal study site has been the Koffler Scientific Reserve at Jokers Hill.||Colin Cassin studied impacts of invasive earthworms on seeds of forest plants. Michelle Schafer investigated whether different fungal communities make some habitats more dangerous to seeds. Deborah Manners considered influences of pathogens on survival of tree seeds.|
|Beetles on St. Johnswort||Testing the Enemy Release Hypothesis of plant invasions. This is the idea that non-native plants may have an advantage over natives because they lost their enemies (herbivores and pathogens) during the invasion process. This work was centred at the Koffler Scientific Reserve at Jokers Hill.||Steve Hill studied how phylogenetic isolation influences enemy release; Sean Blaney studied whether enemy release applies to pathogens and predators of seeds.|
|Beetles on Ragweed||Biology of Common Ragweed (Ambrosia artemisiifolia). Ragweed is a North American native which has widely invaded Europe, Asia, and elsewhere. We have studied this plant both in its native range and in areas where it has been introduced.||James MacKay studied whether isolated populations experience less damage by natural enemies. Andrew MacDonald investigated whether natural enemies have a significant impact on fitness.|
|Akimiski Island Saltmarsh||Changes in arctic habitats used by nesting Snow Geese. Foraging by these birds and other geese has significant impacts on vegetation surrounding their breeding colonies. Study sites have included areas on the coasts of Hudson and James Bay, as well as Akimiski Island, Bylot Island and Southampton Island.||Pamela O studied effects of grazing by geese on the grass Festuca rubra. Jennie McLaren examined the effects of geese on soil. In 2008 I revisited transects I sampled 10 years earlier on Akimiski to determine how vegetation used by geese has changed. In 2010, I sampled vegetation in Snow Goose colonies on Southampton.|
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