David Clements completed his B.Sc. in Ecology and Evolution at Western University. He researched mite interactions in apple orchards for his Ph.D. at Queen’s in Kingston, Ontario. As a postdoc at the University of Guelph he studied integrated weed management. Clements teaches botany and ecology, including field courses on Salt Spring Island and Hawaii. He researches invasive riparian plants, Garry oak ecosystems and climate change. He has published more than 80 scientific papers. He manages TWU’s field research sites: the main campus Ecosystem Study Area, the Blaauw Eco Forest nearby and the Crow’s Nest Ecological Research Area on Salt Spring Island. He has frequently visited Yunnan Province in China studying the global invasive plant, mile-a-minute. In 2018 he did a sabbatical at Charles Sturt University in Australia. A founding board member of the Christian environmental organization, A Rocha Canada, Clements continues to serve on the science advisory committee.
He has been actively involved in the Canadian Weed Science Society (President in 2013-2014), the Weed Science Society of America and many other scientific societies. He has been an associate editor for the Canadian Journal of Plant Science, Weed Research, Pacific Science, and Invasive Plant Science and Management. He edits a series on the biology and impact of invasive species for Pacific Science and is co-editor for a series in Invasive Plant Science and Management on the biology of invasive plants. He is also actively involved in local stewardship groups, and writes the Green Beat column for the Langley Advance Times newspaper.
Research & Scholarship
Recent funded projects
Central Park Climate Change Resilience Research Project, Contract (2019-2020)
Research team: Vanessa Jones, Virginia Oeggerli, Natalie Cook, Delia Anderson, Jessica Brouwer
Faculty co-advisors: Paul Brown, Geraldine Jordan and David Jordan
Funding Source: City of Burnaby
Total Funding: $55,314
NSERC Discovery Development Grant (2017-2019): “Does ecotype variation in invasive species foster adaptation to local climates and ultimately to climate change?”
Funding Source: Natural Sciences and Engineering Research Council of Canada
Total Funding: $20,000
Murdock College Science Research Program - Ramp Up Grant (2016-2018): Garry oak ecosystem research & invasive knotweed biology
Funding Source: MJ Murdock Charitable Trust
Total Funding: $257,457
Portion of Funding Received: $17,780
Provost Research Grant (2016): “Changes in age structure and diet of invasive centrarchid fish populations under management by electrofishing”
Funding Source: Trinity Western University (TWU)
Total Funding: $2,355
Government of Canada Summer Jobs Program (2016): Northern red-legged frog monitoring study
Funding Source: Government of Canada
Total Funding: $4,764
Recent NSERC USRA students (~$9000 each):
Curtis Abney (2015): Northern red legged frog habitat study
Delia Anderson (2019): Red/far red light effects on knotweed seed germination and growth
Maria Goncharova (2019): Water disturbance and knotweed seed germination
Maria Goncharova (2020): Water disturbance and knotweed seedling establishment
Recent Weed Science Society of America Award students ($2000 USD each):
Matthew Strelau (2016): Potential Glyphosate Resistance in Fallopia x bohemica in British Columbia
Virginia Oeggerli (2020): Bohemian Knotweed (Reynoutria xbohemica) Seedling Response to Reduced Photosynthetic Active Radiation
B.Sc., University of Western Ontario, London, Ont., Canada 1986
Ph.D., Queen's University, Kingston, Ont., Canada 1991
Awards & Honors
Endeavour Research Fellowship - $18,500, awarded by the Australian Department of Education and Training (2018)
Canadian Weed Science Society of America Excellence in Weed Science (2014 winner)
LEPS Stewardship Volunteer of the Year Award Recipient (2009)
- Shen S, Xu G, Li D, Jin G, Liu S, Clements DR, Yang Y, Rao J, Chen A, Zhang F, Zhu X. (2019). Ipomoea batatas (sweet potato), a promising replacement control crop for the invasive alien plant Ageratina adenophora (Asteraceae) in China. Management of Biological Invasions. 10(3): 559-572.
- Shen S, Xu G, Li D, Jin G, Liu S, Clements DR, Yang Y, Rao J, Chen A, Zhang F, Zhu X, Weston LA.
- (2019). Potential use of sweet potato (Ipomoea batatas (L.)Lam.) to suppress three invasive plant species in agroecosystems (Ageratum conyzoides L., Bidens pilosa L., and Galinsoga parviflora Cav.). Agronomy. 9(6): 318.
- Xu G, Shen S, Zhang Y, Clements DR, Yang S, Li J, Dong L, Zhang F, Jin G, Gao Y. (2019). Designing cropping systems to improve the management of the invasive weed Phalaris minor Retz.. Agronomy. 9(12): 809.
- Clements DR, Day MD, Oeggerli V, Shen SC, Weston LA, Xu GF, Zhang FD, Zhu X. (2019). Site-specific management is crucial to control of a global weed, Mikania micrantha. Weed Research. 59(3): 155-169.
- Xu G, Shen S, Zhang Y, Clements DR, Yang S, Li J, Dong L, Zhang F, Jin G, Gao Y. (2019). Designing cropping systems to improve the management of the invasiveweed Phalaris minor Retz.. Agronomy. 9(12): 809.
- Abney CR, Balzer SW, Dueckman A, Baylis A, Clements DR. (2019). Early spring and early vanishing wetlands as harbingers of the future? The climate change trap for ephemeral-pond-breeding frogs such as the Northern Red-legged Frog (Rana aurora). Northwest Science. 93(1): 52-65.
- Shen S, Xu G, Chen F, Clements DR, Gu X, Ji S, Zhang L, Yang H, Zhang F, Yin K, Zhang, H Li H, Wu D.(2018). Effects of Aphidius gifuensis release on insect community and diversity in tobacco fields of Yunnan Province, China. Pakistan Journal of Biological Sciences. 21(6): 284-291.
- Xu G, Shen S, Zhang F, Zhang Y, Kato-Noguchi H, Clements DR. (2018). Relationship between allelopathic effects and functional traits of different allelopathic potential rice accessions at different growth stages. Rice Science. 25(1): 32-41.
- Strelau M, Janse van Rensburg M, Clements DR. (2018). Dose-response methodology for variant populations of Bohemian knotweed (Reynoutria ×bohemica Chrtek & Chrtková). Canadian Journal of Plant Science. 98(6): 1380-1383.
- Shen S, Xu G, Li D, Clements DR, Jin G, Liu S, Yang Y, Chen A, Zhang F, Kato-Noguchi H. (2018). Allelopathic potential of sweet potato (Ipomoea batatas) germplasm resources of Yunnan Province in southwest China. Acta Ecologica Sinica. 38(6): 444-449.
- Shen S, Xu G, Li D, Clements DR, Jin G, Liu S, Yang Y, Chen A, Zhang F, Hisashi KN. (2018). Allelopathic effects of three sweet potato cultivars (Ipomoea batatas) on the invasive plant Mikania micrantha. Pakistan Journal of Biological Sciences. 21(1): 8-15.
- Strelau M, Clements DR, Webb C, Prasad R. (2018). The Biology of Canadian Weeds. 156. Daphne laureola L.. Canadian Journal of Plant Science. 98(4): 947-948.
- Strelau M, Clements DR, Benner J, Prasad R. (2018). The Biology of Canadian Weeds. 157. Hedera helix
- L. and Hedera hibernica (G. Kirchn.) Bean. Canadian Journal of Plant Science. 98(5): 1005-1022.
- Young SL, Clements DR, DiTommaso A. (2017). Climate dynamics, invader fitness, and ecosystem resistance in an invasion-factor framework. Invasive Plant Science and Management. 10(3): 215-231.
See other publications on Research Gate at: https://www.researchgate.net/profile/David_Clements
Affiliations & Memberships
- A Rocha Canada
- American Scientific Affiliation
- Au Sable Institute of Environmental Studies
- Canadian Weed Science Society
- Climate Crisis Langley Action Partners
- Fraser Valley Invasive Species Society
- Invasive Species Council of British Columbia
- Langley Environmental Partners Society
- Langley Field Naturalists
- Invasive Species Council of Metro Vancouver
- Northwest Science Society
- Plant Canada
- Salmon River Enhancement Society
- Weed Science Society of America
- Weed science
- Christian environmental theology
- Threatened ecosystems/restoration
- Invasive species biology
- Principles of Biology (BIOL 113)
- Introduction to Biology I, Ecology and Biodiversity (BIOL 103)
- Biology of Vascular Plants (BIOL 212/312)
- Biology of Nonvascular Plants (BIOL 214/314)
- Environmental Studies Internship (GENV 374)
- General Ecology (BIOL 381)
- Plant Ecology (BIOL 316)
- Tropical Botany (BIOL 318)
- Ideas that Inspire (FNDN 201)
- Christian Perspectives in the Sciences: Life Sciences (NATS 481)
- Senior Thesis Supervision (BIOL/ENVS 409/410)