2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 9:30 AM - 9:45 AM | NITROGEN LIMITATION OF LAKE SUPERIOR COASTAL WETLANDS | 430 B
NITROGEN LIMITATION OF LAKE SUPERIOR COASTAL WETLANDS
Nitrate concentrations are relatively high and rising in the offshore waters of Lake Superior. Coastal habitats, on the other hand, appear to exhibit closer stoichiometric balance between N and P with primary productivity potentially limited by N availability. We conducted biofilm nutrient amendments in coastal wetlands along the south shore of Lake Superior. We predicted that N limitation was related to surrounding watershed land cover and coastal geomorphology, and that N limitation would vary within wetlands. Our results suggest that algal biofilms in Lake Superior coastal wetlands are N limited in general and that both coastal geomorphology and surrounding land cover influence N limitation. The strongest N limitation occurred in wetlands protected from wave energy and pelagic mixing and surrounded by forested land. Tributary sediment deposition reduced biofilm productivity and influenced within-wetland nutrient limitation patterns. Coastal wetlands represent important nutrient gateways that link tributaries to the Lake Superior nearshore. As climate and land use patterns change throughout the Great Lakes basin, N cycling within the coastal margin is likely to change as well, which could have broad implications that are not currently understood.
- Biogeochemistry
- Limitation
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Presenters/Authors
Matthew Cooper
(), Burke Center for Freshwater Innovation, Northland College, mcooper@northland.edu;
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Aletha Hefko
(), Northland College, hefkoa821@myemail.northland.edu;
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Michele Wheeler
(), Wisconsin Department of Natural Resources, Michele.Wheeler@wisconsin.gov;
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