Graham Sustainability Institute

Quantifying Nutrient Retention by Lake Erie Coastal Wetlands

April 2018

The return of large harmful algal blooms to Lake Erie, as well as low oxygen levels (hypoxia) in lake bottom waters, have led to an intensified effort to understand, predict, and reduce nutrient loading to the lake. Coastal wetland restoration has been identified as a management tool for achieving an international goal of 40 percent reduction in phosphorus loading to Lake Erie. For example, wetland restoration is central to nutrient reduction plans for Sandusky Bay, Ohio. However, the capacity of different coastal wetlands to retain nutrients and improve water quality is not well understood.

This project will address key information gaps identified by land managers, regulators, and conservation groups involved in coastal wetland restoration and management efforts around Lake Erie. Specifically, these groups require more precise estimates of nutrient retention in wetlands in order to inform decisions around wetland management, hydrologic reconnection of diked wetlands, and the potential creation of coastal wetlands to manage nutrient run-off. The ability to quantify and communicate the role of wetlands in nutrient management is critical for the development of achievable plans for meeting agreed upon water quality targets for Lake Erie and Sandusky Bay.