Brown-MBL student Lindsay Brin successfully defended her PhD dissertation on September 6th, 2013 at Brown University. Lindsay, a student in the Department of Ecology and Evolutionary Biology at Brown University, conducted her doctoral research in the labs of Brown University Assistant Professor Jeremy Rich and MBL Ecosystems Center Senior Scientist Anne Giblin.
Brin’s research focused on the relationship between environmental factors and microbially-mediated nitrate reduction processes in coastal sediments, particularly denitrification, anammox and dissimilatory nitrate reduction to ammonium (DNRA). The rates and relative importance of these processes affect how much nitrogen (N) is available in coastal ecosystems for primary productivity and eutrophication, and are linked to climate through global marine N cycling. Understanding the controls on these processes is essential for predicting the effects of climate change and other environmental alterations on coastal ecosystems.
Brin illustrated the role of temperature, organic matter and nitrate in determining rates of nitrate reduction in New England coastal sediments, providing some of the first seasonal data on these processes and the first measurements of anammox and DNRA in these sediments. She demonstrated that warming and changes in organic matter availability could affect positive feedbacks on primary productivity by altering fluxes of N between the sediments and the water column, and further showed that DNRA may be an important unappreciated process in temperate continental shelf sediments.
During her graduate studies, Brin’s research was supported by a National Defense Science and Engineering Graduate Fellowship, a Stanley Watson Graduate Fellowship in Environmental Studies, and a Sounds Conservancy Grant.
In October, Lindsay will begin a National Science Foundation Postdoctoral Research Fellowship in Biology at the Potato Research Centre in Fredericton, NB, Canada, to study the effects of climate change, particularly altered snow cover, on N cycling in agricultural soils. Through a two year field study she will address the question of how does altered snow cover affect soil N cycling and microbial communities in the winter and through the following growing season.