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Arcadia Marsh, Lake Michigan, and Saginaw Bay, Lake Huron: Impacts of Water Levels on Sediment-Water Phosphorous Flux

Alan Steinman;Mary Ogdahl, Donald Uzarski, Matt Cooper
Development of regulation plan performance indicators describing water-level regime impacts on sediment-water phosphorus flux in Arcadia Marsh, Lake Michigan, and Saginaw Bay, Lake Huron. The performance indicator is the total soluble reactive phosphorus (SRP) mass released (kg) as a result of re-wetting of desiccated wetland sediments in Arcadia Lake and Saginaw Bay. In most aquatic ecosystems, external load is usually viewed as the major source of nutrients, but in certain systems such as shallow lakes and wetlands, internal loading derived from desiccation and re-wetting of sediments due to a varying hydrologic regime can alter the magnitude and timing of nutrient release (primarily N and P) from wetland sediments. Desiccation and re-wetting experiments were performed on cores collected from Arcadia Marsh and Saginaw Bay in April 2010. Changes in SRP release affect the productivity of benthic and planktonic algae as well as submergent vegetation.
Ecosystem PI 07: Sediment-water phosphorus flux
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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?
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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
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Coping Zones