Indiana CCA Conference 2018 Presentation



Soil & Water
Tue, Dec 18, 2018
10:00am to 10:50am


Soil & Water
Tue, Dec 18, 2018
3:00pm to 3:50pm


Grand Lake St Marys (GLSM) is a hypereutrophic lake situated in the primarily agricultural GLSM watershed of northwest Ohio. Over the past decade, numerous surveys have characterized the environmental quality of the lake as highly impaired. Elevated nutrient rich runoff levels coupled with the physical characteristics of the watershed have acted as catalysts for frequent harmful algal blooms resulting in no contact warnings and drinking advisories which have impacted the region environmentally and economically. In 2011, the watershed was officially declared distressed by the state of Ohio. Following this designation, a series of voluntary and obligatory best management practices, conservation initiatives, and rules were implemented in an effort to reduce nutrient loading on a watershed scale. These efforts included constructing wetlands and in-lake littoral areas, increasing the use of filter strips, riparian buffers, cover crops, improving manure management practices, such as transferring manure out of the watershed and increasing covered manure storage, and the implementation and enforcement of policies encompassing the maintenance of nutrient management plans and a watershed wide ban on winter manure application. Since 2011, nitrogen and phosphorus concentrations have greatly declined during the winter months (16-57%) as well as the remainder of the year (12-41%; with exception of spring SRP) during critical medium and high flow loading periods. Despite these impressive declines, however, nutrient levels remain too high. Thus, conservation work in GLSM is ongoing and includes the continued expansion of existing BMPs as well as addition of new wetlands to continue improving water quality region wide.     


Stephen Jacquemin

Associate Professor of Biology
Wright State University

Stephen Jacquemin graduated from Ohio Northern University in 2008 and earned a PhD in Environmental Science from Ball State University in 2013. Dr. Jacquemin’s research interests focus on understanding and improving water quality. Specifically, Dr. Jacquemin studies nutrient runoff and best management practices to reduce eutrophication rates in freshwater systems. In addition, he also studies the ecology and evolution of freshwater fishes and mollusks as they relate to environmental quality. The overarching mission of his work is to promote the conservation of aquatic resources through increased understanding of the various spatial and temporal patterns inherent in the environmental quality of the Ohio River and Great Lakes Watersheds.