I am an ecosystem ecologist who studies biogeochemical cycles and linkages between physical, chemical and biological structure and function in streams, rivers and lakes. Linking biogeochemical patterns and controlling factors often requires understanding the underlying structure of microbial, algal, and animal communities. Therefore, my research occurs at the interface of ecosystem and community ecology. I am particularly interested in research questions that have both fundamental and applied implications, such as how land use change and ecosystem disturbances alter nutrient processing, uptake and export from watersheds and energy flow through food webs. One unifying theme of my research is the role of nutrient and organic matter subsidies on stream ecosystem and food web function.