Recent Topics Posters
White, Andrea L. , Boutin, Céline .
Intraspecific variation in germination characteristics and herbicide sensitivity in geographically distinct populations of eight wild plant species.
Several geographically distinct populations of eight wild plant species with distributions spanning Europe and/or North America were included in the present study. Variations in seed size, germination, and herbicide sensitivity between populations of the wild plant species were investigated. Seed weight differed significantly between populations of all species tested except Bellis perennis and Solidago canadensis. The stratification period and light intensity required for germination, as well as the maximum germination obtained, were different between populations for all species tested except Rumex crispus. Experiments simulating herbicide drift were conducted in a greenhouse using the commercial herbicide Aatrex Liquid 480, which contains the active ingredient atrazine. All populations of a species were tested at the same time. Results showed that herbicide sensitivity can vary appreciably between populations of the same species. Dose-responses were significantly different for all species. Natural and anthropogenic stressors and/or environmental characteristics may induce intraspecific variation among populations of species which could have significant ecological implications. Intraspecific variation between populations of the same species should be considered in risk assessments and the development of conservation strategies. Further testing is required to ascertain the exact nature of the variation identified in populations of the same species.
Log in to add this item to your schedule
1 - Convention on International Trade in Endangered Species (CITES), Environment Canada, Place Vincent Massey (4th floor), 351 St-Joseph Blvd., Gatineau, QC, K1A 0H3, Canada
2 - National Wildlife Research Centre, Environment Canada, Carleton University (Raven Rd.), Ottawa, ON, K1A 0H3, Canada
Presentation Type: Recent Topics Poster
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM