Yu, Y. SUNY at Stony Brook, yiyu@ic.sunysb.edu
Scranton, M. SUNY at Stony Brook, mscranton@notes.cc.sunysb.edu
Taylor, G. T. SUNY at Stony Brook, gtaylor@notes.cc.sunysb.edu

 
BACTERIAL TURNOVER OF SELECTED LOW MOLECULAR WEIGHT ORGANIC MOLECULES IN THE HUDSON RIVER ESTUARY
 
DOC in aquatic ecosystems represents a large pool of energy and nutrients for heterotrophic microorganisms. In this study we examine the relationship between turnover of low molecular weight organic matter and bacterial production, primary production and allochthonous inputs. We measured the contribution of metabolism of acetate, glucose and glycolate to heterotrophic bacterial activity and to the flux of DOC in western Long Island Sound (WLIS) and the lower Hudson River Estuary (HRE). Four stations in WLIS and HRE were sampled at three depths on 12 cruises from Oct.1996 to Sept.1998. Both concentrations and turnover rate constants were measured for the labile monomers. The acetate concentrations in WLIS were generally in the range of 0 to 3 uM, with the higher concentration found in bottom water during the summers of 1997 and 1998 when the water column became quite stratified and bottom water turned hypoxic. The acetate concentrations in HRE varied from 0 to 16.3 uM. The turnover times of acetate were in the rage of 3.1 hr to 3.9 days. Glucose and glycolate concentrations were measured using a kinetic approach, and were all in the nanomolar range. Uptake rates will be compared to temperature, primary production, bacterial production and oxygen consumption.
 
Day: Thursday, Feb. 4
Time: Poster
Location: Sweeney Center
 
Code: SS33TH0535S