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Zebra Mussels Monitoring in the St.Lawrence River

Since the first evidence of Zebra Mussels (Dreissena polymorpha) in the St. Lawrence River in 1989, a monitoring program to track the annual recruitment of the species has been established by Environment Canada. The annual abundance of Zebra Mussels attached on navigation buoys distributed along the river between Cornwall and Quebec City has yielded a continuous time series of Zebra Mussels recruitment since 199 . Strong annual variation in numbers of recruits and potential for colonization was shown to be related to summer river discharge. Recruitment is spatially heterogeneous and centers of high recruitment varies from year to year. Benthic surveys in 1992 and 1996 confirmed spatial patterns of Zebra Mussels distribution derived from recruitment monitoring.

In progress
Start Date
End Date
Scope of Study
Field Investigation
Scale of Phenomena
Lake Basin Connecting Channels
St.Lawrence River
Spread of Established ANS Populations
Rate of Spread
Annex Numbers
Research & Development
Surveillance and Monitoring

The Great Lakes - St. Lawrence Research Inventory is an
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up-to-date information about research projects in the
Great Lakes - St. Lawrence Region.