2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | THE STOICHIOMETRY OF LAKE RESTORATION | Virtual Platform
THE STOICHIOMETRY OF LAKE RESTORATION
Lakes in human-dominated landscapes are increasingly eutrophic and impaired. Managers have thus employed a variety of strategies to reduce nutrient loading and restore ecosystem function. In the agriculturally-dominated state of Iowa, a statewide nutrient reduction strategy and lake restoration program has targeted reduction in nitrogen pollution while legacy phosphorus in soils and sediments continues to release P to lakes. We examined the stoichiometric consequences of these restoration activities using an 18 -year dataset from 130 publicly significant lakes in Iowa. Nutrient reduction strategies have successfully reduced N concentrations in both restored and unrestored lakes. However, P concentrations have increased in unrestored lakes while restored lakes exhibited no significant change in P. As a result, water column TN:TP has generally decreased in Iowa lakes over the past two decades. Surprisingly, this has not coincided with corresponding changes in phytoplankton or Cyanobacteria biomass. Our results suggest that stoichiometric trait shifts in zooplankton communities led to consistent top-down control on phytoplankton biomass. The general lack of responses in key metrics like phytoplankton and Cyanobacteria biomass to restoration could be explained by these stoichiometric shifts.
- Nutrients
- Restoration
- Pollution
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Presenters/Authors
Eric Moody
(), Middlebury College, ekmoody@middlebury.edu;
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Gardner Olson
(), Middlebury College, golson@middlebury.edu;
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Grace Wilkinson
(), University of Wisconsin-Madison, wilkinso@iastate.edu;
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