CBE Spring 2017 Seminar Series Presents a Seminar with Joy Buongiorno
- Thursday, March 30, 2017 from 4:10pm to 5:00pm
- Roberts Hall - view map
Joy Buongiorno is a PhD candidate in microbiology at the University of Tennessee in Knoxville, working with Dr. Karen Lloyd. At this week's seminar, Joy will present “High-resolution microbial community abundance and composition analysis of two iron-rich fjords, Kongsfjorden and Van Keulenfjorden, Svalbard (79degN): Implications for climate response.” Please see her presentation abstract below.
Presentation abstract: As global temperatures continue to rise in response to atmospheric greenhouse gas concentrations (IPCC, 2007), polar regions are experiencing tangible environmental alterations. Most noticeably, calving of ice shelves in the Antarctic and glacial retreat in the Arctic have been observed, leaving the question of what impact these processes will have on ecosystem biodiversity and element cycling. In the high Arctic, which is the most sensitive to a warming climate, glacial retreat has the potential to disrupt biogeochemical cycles. This is because shrinking glaciers will no longer act as conduits of turbid sediment, which in turn will enhance penetration of sunlight into the fjord and foster blooms of phytoplankton that feed benthic microbial communities. In this way, increased organic matter delivered to sediments may induce a positive feedback of increased greenhouse gas emission as this organic matter is degraded. Here, we investigate the current microbial community structure of sediments underlying glaciers within Kongsfjorden and Van Keulenfjorden, Svalbard (79°N). Kongsfjorden sediments are deposited under Kongsbreen and Kronebreen, which are retreating at a rate of 0.5 km yr-1 (Lefauconnier et al., 1994). Runoff from these hematite-rich glaciers feeds iron into the fjord, which collects in the anoxic sediments and drives a unique subsurface geochemical profile where sulfate becomes reoxidized as far down as 20 centimeters below the surface. In order to characterize the microbial abundance and community composition within these sediments, we extracted DNA at 1 cm intervals as deep as 20 centimeters into the sediment. We place these data into the context of paleoenvironmental fluctuations in temperature to resolve any patterns associated with response to climate variability which may help make predictions about microbial response with future warming.
If you would like to meet with Joy, please contact her at JBuongio@vols.utk.edu
- Center for Biofilm Engineering