2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2019 | 3:15 PM - 3:30 PM | IMPACTS OF SHORELINE RESTORATION AND SOURCE OF NUTRIENT ENRICHMENT ON MACROPHYTE AND EPIPHYTIC ALGAL COMMUNITIES | 151 ABC
IMPACTS OF SHORELINE RESTORATION AND SOURCE OF NUTRIENT ENRICHMENT ON MACROPHYTE AND EPIPHYTIC ALGAL COMMUNITIES
Macrophytes are critical to littoral zones by providing sediment stability, habitat refugia, and nutrient cycling. Epiphytic algae reside on macrophyte surfaces and their proximity can alter resource availability (i.e., nutrients, light). As bioindicators, both macrophytes and algae are increasingly used to detect aquatic anthropogenic alterations. With an industrial past, Muskegon Lake (MI) has undergone human disturbances, such as shoreline hardening and sediment contamination. Lake restoration included shoreline softening; we conducted a macrophyte survey (2009-2012, 2018) to assess immediate and long-term ecological improvements. Survey results suggest that macrophyte biomass and densities have recovered from initial restoration, and post-restoration communities may be more resilient to annual hydrologic variations. One factor potentially influencing macrophyte and epiphytic algae dynamics is the source of nutrient loading (i.e., water column or sediment), as each primary producer has differential access to nutrients. To address the role of nutrient source, a mesocosm experiment was conducted using the macrophyte Vallisneria americana. Nitrogen and phosphorus were added to the water column and/or sediment of 12 mesocosms in a factorial design to evaluate macrophyte biomass and algal community structure changes. Preliminary results indicate water column nutrients stimulate higher epiphytic algae growth.
- Algae
- Restoration
- Mesocosm
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Presenters/Authors
Paige Kleindl
(), Annis Water Resources Institute-Grand Valley State University, kleindlp@mail.gvsu.edu;
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Alan Steinman
(), Annis Water Resources Institute-Grand Valley State University, steinmaa@gvsu.edu;
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