Skip directly to content

Minimize RSR Award Detail

Research Spending & Results

Award Detail

Doing Business As Name:University of Georgia Research Foundation Inc
  • Patricia L Yager
  • (706) 542-6824
Award Date:08/14/2009
Estimated Total Award Amount: $ 314,049
Funds Obligated to Date: $ 314,049
  • FY 2009=$314,049
Start Date:09/01/2009
End Date:08/31/2012
Transaction Type:Grant
Awarding Agency Code:4900
Funding Agency Code:4900
CFDA Number:47.078
Primary Program Source:040101 RRA RECOVERY ACT
Award Title or Description:Collaborative Research: Does competition for nitrogen between autotrophs and heterotrophs control carbon fluxes in the western coastal Arctic?
Federal Award ID Number:0910252
DUNS ID:004315578
Program:ANS-Arctic Natural Sciences
Program Officer:
  • Henrietta Edmonds
  • (703) 292-7427

Awardee Location

Street:310 East Campus Rd
Awardee Cong. District:10

Primary Place of Performance

Organization Name:University of Georgia
Street:310 East Campus Rd
Cong. District:10

Abstract at Time of Award

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Yager 0910252 University of Georgia Unds are provided to investigate the microbial controls on the productivity of a coastal Arctic ecosystem by focusing on the competition between autotrophs and heterotrophs for nitrogen (N). In the winter and summer waters near Barrow, Alaska, supplemented with complementary international research opportunities, the PIs propose to measure in situ concentrations of key microbial and biogeochemical constituents, relevant uptake activities, and expression of key N cycling genes to address two hypotheses: H1: The balance of autotrophy and heterotrophy in the Arctic is regulated both temporally and spatially by nitrate (NO3ˉ) and light. ? Phytoplankton out-compete heterotrophic bacteria for NO3ˉ during the well-lit spring and summer conditions. ? Heterotrophic bacterial uptake of NO3ˉ will be greater during the dark winter and under sea ice than in open water or well-lit summer conditions when bacteria are replete with phytoplankton-derived DON. ? NO3 -, combined with terrestrial DOC derived from riverine and groundwater flow, may provide the means for bacterial growth and respiration during the dark winter. H2: Microbial community structure will vary according to the seasonal light cycle and the sources of available N. The observed lag in bacterial response to phytoplankton growth is due to a community shift. ? Bacterial community composition will vary significantly between winter and summer. ? The composition and dynamics of bacterial communities will correspond to concentrations and sources of N. ? The expression of key N-cycling genes, N-uptake and regeneration, and DON uptake kinetics will vary with season and community composition.

Publications Produced as a Result of this Research

Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher. Some full text articles may not yet be available without a charge during the embargo (administrative interval).

Some links on this page may take you to non-federal websites. Their policies may differ from this site.

Garay, L., Wotkyns A.M., Lowry KE, Warburton J, Alderkamp A-C, and P.L. Yager "Teachers and researchers working together to enhance student learning." Elementa Sci. Anth., v.2, 2014, p.. doi:10.12952/journal.elementa.000034 

Connelly, T.L., S.E. Baer, J.T. Cooper, D.A. Bronk, B. Wawrik "Urea Uptake and Carbon Fixation by Marine Pelagic Bacteria and Archaea during the Arctic Summer and Winter Seasons" Applied and Environmental Microbiology, v.80, 2014, p.6013. doi:10.1128/AEM.01431-14 

Baer, S.E., T.L. Connelly, R.E. Sipler, P.L. Yager, D.A. Bronk "Effect of temperature on rates of ammonium uptake and nitrification in the western coastal Arctic during winter, spring, and summer." Global Biogeochemical Cycles, v., 2014, p.. doi:10.1002/2013GB004765 

For specific questions or comments about this information including the NSF Project Outcomes Report, contact us.