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St. Louis River Estuary, Lake Superior, and Green Bay, Lake Michigan: Impacts of Water Levels on Invertebrate & Fish

Valerie Brady;Dan Breneman
Development of regulation plan performance indicators describing water-level regime impacts on the northern wetlands at St. Louis River Estuary, Lake Superior, and Green Bay, Lake Michigan. Invertebrate taxa habitat richness and fish habitat richness were selected as representative performance indicators for overall wetland health at both sites. Coastal wetland macroinvertebrates are the intermediate link in the food chain for many Great Lakes forage fish and juvenile predatory fish. Wetland invertebrates convert plant and algal biomass into a food resource for forage and juvenile predatory fish. Likewise, coastal wetlands serve as spawning grounds, nurseries and feeding areas for many Great Lakes fishes, and many species use these wetlands during some part of their life history. Performance indicators developed were based on Great Lakes Environmental Indicator data collected in 2002-2003.
Ecosystem PI 03: Northern Wetland Macroinvertebrates
Ecosystem PI 04: Northern Wetland Fish
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Supporting Content (Show)
Main Topics
Lake Superior Regulation
Questions We Asked
What constitutes improved plan performance?
Does the plan reduce environmental impacts?
View all 3 questions we asked
How vulnerable are interest groups to extremes?
Key Findings
Plan 2012 will be more robust and provide important benefits compared to Plan 77A
Plan 2012 performs similar to Plan 77A under 20th century NBS
Ecosystems Evaluation
Performance Indicators
View all 3 tasks
Coping Zones