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Managing Invasive Species

July 28, 2020

Invasive species are moving beyond native habitats due to travel and transport, as highway corridors cut through the geologic barriers that once prevented spread. Construction activities can also introduce invasive species through the use of contaminated equipment or weedy soil and gravel.

Infestations of invasive species can reduce the productivity of agricultural and rangeland, disrupt ecological processes, harm recreation and land values, increase soil erosion, and create health risks for humans, animals and crops. Roadside infestations can create unsafe conditions for road users, damage roadways, and increase costs for mowing and spraying.

Transportation agencies must play an active role in preventing and controlling invasive species, but have limited budgets for long-term control and eradication. This webinar will introduce the science around invasive species movement, and identify areas in the transportation sector where prevention and control efforts could be focused.


Shauna Lehmann, Saskatchewan Ministry of Highways and Infrastructure

Shauna Lehmann is the Director of Environment at the Saskatchewan Ministry of Highways and Infrastructure, a board member on the Saskatchewan Invasive Species Council, and Chair of TAC’s Environment & Climate Change Council. Shauna’s passion for invasive species management began several years ago after attending a conference of the North American Invasive Species Management Association. Since she tends to talk about weeds a lot, she often finds random plant parts left on her desk with a note asking for identification – a practice she wouldn’t necessarily recommend, but it’s more entertaining than looking at photos.

The Transportation Association of Canada (TAC) makes no representations or warranties about the accuracy or suitability of any information presented in the webinars and related materials (such as handouts, presentation documents and recordings); all such content is provided to TAC’s members and webinar registrants on an ‘as is’ basis. TAC is not liable for any information provided by instructors and presenters of these webinars. TAC hereby disclaims all liability for any claims, losses, or damages in connection with use or application of these materials. TAC does not guarantee, warrant, or endorse the products or services of any firm, organization, or person. The information contained in these webinars and related materials is not intended to constitute legal advice or the rendering of legal, consulting, or other professional services of any kind. Users of these materials should not in any manner rely upon or construe the information or resource materials in these materials as legal, or other professional advice and should not act or fail to act based upon the information in these materials without seeking the services of a competent legal or other professional.