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Lake Simcoe ecosystem changes: response to zebra mussels and climate change

The aquatic invasive species known to be in the lake and their dates   of introduction (where known) include:  - Common carp (Cyprinus carpo) - 1896  - Rainbow smelt (Osmerus mordax) - 1962  - Eurasian watermilfoil (Myriophillum spicatum) - 1984  - Curly-leaf pondweed (Potamogeton crispus)- 1961-1984  - Black crappie (Pomoxis nigromaculatus) - 1987  - Zebra mussel (Dreissena polymorpha) - early 199 s  - Spiny water flea (Bythotrephes longimanus) - 1993  - Bluegill (Lepomis macrochirus) - 2     - Quagga mussel (Dreissena bugensis) - 2  4  - Rusty crayfish (Oronectes rusticus) - 2  4  - Round goby (Neogobius melanostomus) - 2  6    Zebra mussels have physically restructured lake trout spawning   habitats and have altered P cycling and energy flow in the nearshore   areas of Lake Simcoe. The rainbow smelt invasion was linked to   decline in the lake whitefish population and the invasion of the   lake by zebra mussels has been linked to system-wide changes   including changes in water quality and increased production of   aquatic plants. The expected relationships between phosphorus   increase and oxygen depletion in Lake Simcoe has been complicated by   the presence of zebra mussels.     In studies in Lake Erie and Lake Ontario where the dreissenid   mussels invaded a decade earlier than Lake Simcoe, the filtering of   the mussels has resulted in increased water transparency and   increased concentration of particulate and dissolved P in the   nearshore areas. The increased water clarity and increased P in   areas colonized by dreissenid mussels appears to have caused a   dramatic increase in nuisance blooms of the filamentous green   benthic alga Cladophora in these lakes. At the same time, the   biomass of algae in the offshore of these lakes declined. However,   it is not possible to infer if the offshore decline is linked to the   increase in algal biomass in the nearshore or whether it is part of   a response to some other larger scale ecological process affecting   lakes both with and without dreissenid mussels.    (climate change); (zebra mussels); (Dreissena polymorpha);   (Dreissenids); (Dreissenid); (zebra mussel); (aquatic invasive   species); (AIS); (aquatic nuisance species); (ANS); (Lake Simcoe);   (Ontario); (algal bloom); (algal blooms); (phosphorous);   (eutrophication)

Status
In progress
Type
Project
Start Date
End Date
Scope of Study
Field Investigation
Laboratory Investigation
Literature / Existing Data
Scale of Phenomena
Ecosystem
Organism
Impact of Pollutants
Exotic Species
Nutrients, Including Phosphorus
Land Use and Habitat
Shoreline
State Province
Ontario
Control And Mitigation
Integrated Control Strategy
Annex Numbers
Control of Phosphorus
Research & Development
Annex 17
Cause-effect inter-relationships of productivity and ecotoxicity
Mass transfer of pollutants between GL Basin Ecosystem components
General
Annex
  • Annex Numbers
    Annex Numbers
    Control of Phosphorus
    Research & Development
  • Annex 17
    Annex 17
    Cause-effect inter-relationships of productivity and ecotoxicity
    Mass transfer of pollutants between GL Basin Ecosystem components

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