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Arcadia Marsh, Lake Michigan: Impacts of Water Level Fluctuations on Wetland Vegetation

Douglas Wilcox;
Development of regulation plan performance indicators describing water-level regime impacts on wetland meadow marsh community in Arcadia Marsh, Lake Michigan. The performance indicator is the wetland-specific surface area estimate of meadow marsh vegetation (hectares) in Arcadia Marsh. Meadow marsh vegetation develops between the maximum long-term high water level and the long-term mean. Meadow marsh plant communities are highly diverse and often occur within a relatively narrow hydrologic range in comparison to other wetland vegetation communities. The presence of meadow marsh is a positive indicator of wetland plant biodiversity and natural water-level regimes. Changes in the surface area (percent) of meadow marsh were determined by photointerpretation of imagery over a span of 17 years (1954-2010). Arcadia marsh is representative of many drowned river mouth wetlands along the north-eastern shore of Lake Michigan.
Ecosystem PI 06: Wetland Meadow Marsh, Arcadia Marsh
Arcadia Lake Ecosystem
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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