Please join SAFS and the College of the Environment today for Freshwater Sciences faculty search candidate, Becca Barnes‘ seminar, entitled Nitrogen and Landscapes: An Alpine to Urban Perspective.
Freshwater Sciences Faculty Search Candidate Seminar
Dr. Becca Barnes,
Tuesday, April 16
4:00 p.m., Fisheries (FSH) 102
Humans have severely altered the nitrogen cycle through energy and food production activities, resulting in the over-fertilization of our planet. New, anthropogenically-created, fixed nitrogen enters the ecosystem through a variety of methods – from acid deposition to fertilizer application – often impacting systems far removed from the initial source. The ability of the receiving landscape to process these inputs is dependent on ecosystem type (e.g. soil development, vegetation type) and hydrology and thus global change drivers (warming temperatures, urbanization) will likely change the landscape’s ability to modulate incoming nitrogen. Given that rivers and streams effectively integrate the physical, biological, and chemical processes of the watersheds they drain, we can use their biogeochemistry as an indicator of ecosystem health. Further, by examining the stream stoichiometry we can understand how in-stream processes regulate nitrogen exports to the coast. Research utilizing long-term datasets, observational studies, and experimental methods will illustrate (1) the importance of hydrology in the removal and retention of nitrogen within alpine and urban watersheds, (2) the role of organic matter on the processing of nitrogen, and (3) the need to consider a landscape’s legacy in assessing how nitrogen export will respond to global change and environmental management decisions.