Urea uptake and carbon fixation by marine pelagic bacteria and archaea during the Arctic summer and winter seasons.

ABSTRACT: How Arctic climate change might translate into alterations of biogeochemical cycles of carbon (C) and nitrogen (N) with respect to inorganic and organic N utilization is not well understood. This study combined 15N uptake rate measurements for ammonium, nitrate, and urea with 15N- and 13C-based DNA stable-isotope probing (SIP). The objective was to identify active bacterial and archeal plankton and their role in N and C uptake during the Arctic summer and winter seasons. We hypothesized that bacteria and archaea would successfully compete for nitrate and urea during the Arctic winter but not during the summer, when phytoplankton dominate the uptake of these nitrogen sources. Samples were collected at a coastal station near Barrow, AK, during August and January. During both seasons, ammoniu

SUBMITTER: Connelly TL 

PROVIDER: S-EPMC4178671 | biostudies-literature | 2014 Oct

REPOSITORIES: biostudies-literature