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Report: Lillooet Regional Invasive Species Society Aquatic Invasives Project 14.W.SON.04
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If you have any questions on the information presented, or require additional report data or attachments, please contact the Report Contact
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The Lillooet Regional Invasive Species Society (LRISS) with the BC Hydro Fish and Wildlife Compensation Program
grant has formally initiated an Aquatic Invasive Species (AIS) program.
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Author: J. Rasmussen
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Old Reference Number: FWCP Project - 16.W.SON.04
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Date Published: Mar 2016
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Report ID: 50222
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Audience: Government and Public
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The Lillooet Regional Invasive Species Society (LRISS) with the BC Hydro Fish and Wildlife Compensation Program
grant has formally initiated an Aquatic Invasive Species (AIS) program. This project focused on creating an AIS
Strategy and Action plan as well as a field program. LRISS crews surveyed and treated high priority shorelines.
In the past, our program has focused primarily on terrestrial plants, but we found two invasive species in our
region that are found in aquatic environments: Japanese Knotweed (Fallopia japonica.) and Yellow Flag Iris (Iris
pseudacorus). These species as well as other AIS, like invasive mussels, have the ability to impact salmon
spawning sites, riparian habitat as well as important BC Hydro infrastructure. It was essential that we treat the
known sites and start a formal AIS program with goals and actions.
The goals of this project included:
1. Develop an Aquatics Action Plan.
2. Inventory lakes, riparian and wetland habitat for aquatic invasives.
3. Treat selected priority sites in order to gain a better understanding of time and costs for treatment
(treatment options and plans will be identified in the Aquatics Action Plan).
4. Partner with stakeholders, local community associations and First Nations to educate their members
about invasive identification and best management practices to prevent establishment and spread.
5. Participate in local events to raise awareness of this project and the threat of aquatic invasives in our
area (there is an Education and Awareness component of the Action plan).
All of the goals were successfully met for this project. An Aquatics Invasive Species Strategy and Action Plan for
our region have been developed and LRISS will start implementing it this year. LRISS participated in events and
meetings to share information about this project. We had a display at the Bridge River Summer Festival in Gold
Bridge as well as participated in the Tyaughton Lake Rate Payers AGM to educate people about AIS and this
project. LRISS submitted an article to the Mountain Telegraph (distribution primarily the Bridge River Valley
residents) and posted to social media details of the project. LRISS has also secured partnerships with the Seton
Lake First Nations and the Tyaughton Lake Rate Payers to manage and treat AIS in their areas.
The field component focused on surveys and treatment. Using the Ministry of Forests, Lands and Natural
Resource Operations Invasive Alien Plant Programs survey procedures, LRISS crews surveyed 150 kilometers of
shoreline primarily targeting Knotweed species and Yellow Flag Iris. Downton, Carpenter, Tyaughton and
portions of Seton Lake shorelines were surveyed. Seven Yellow Flag Iris sites were treated and approximately
700 kilograms of plant matter was removed. It was clear during our treatment on west Seton Lake and
Tyaughton Lake that we would not be able to remove all of the Yellow Flag Iris patches during this project. LRISS
crews ensured that all patches were mapped (22) using our IPad GISPro Application for future treatment. IAPP
surveys were completed for all of the sites that were treated. Survey information establishes whether a site has
changed in size and if treatment is effective.
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