Education: PhD, Oregon State University
CV: Download CV
Email Address: email@example.com
Location: Darling Marine Center
Mailing Address: Darling Marine Center, 193 Clarks Cove Road, Walpole, ME 04573
I am a microbial ecologist who addresses fundamental questions about the structure and function of microbial communities in marine ecosystems. I am most widely recognized for my work on the molecular diversity of denitrifying bacteria in soils and microbial controls on denitrification and anammox rates in marine systems. My current research continues along these themes in marine systems while expanding into new research areas. I am taking advantage of isotopes, microsensors, and next generation sequencing to investigate underlying mechanisms controlling these nutrient cycling processes.
My research focuses on three nitrogen cycling processes: denitrification, anammox, and more recently, dissimilatory nitrate reduction to ammonium (DNRA). Each process is carried out by a distinct group of microbes, each with their own unique phylogeny, biochemistry and perhaps ecology. However, in anoxic environments, all of these processes compete for the same resource, nitrate, thereby influencing availability of biologically available nitrogen (N) in ecosystems in different ways. As N is a key limiting nutrient, these processes are linked to the carbon cycle, water quality and climate change. In addition, human activities have more than doubled inputs of biologically available N, setting up a global experiment in which microbial activities ultimately determine the fate of N. A fourth and more recent focus of my research is on the influence of organic matter on successional patterns in microbial communities as it relates directly to the N cycle and more broadly to bacterial communities in the water column in Antarctica.
For a current list of publications please see google scholar