Skoog, A. C. Marine Sciences, University of Connecticut, annelie@amc.chalmers.se
Whitehead, K. C. School of Oceanography, University of Washington,

 
AMBIENT CONCENTRATIONS OF GLUCOSE AND COMBINED NEUTRAL ALDOSES AND THE EFFECT OF INORGANIC NUTRIENT CONCENTRATIONS ON MICROBIAL ASSIMILATION OF GLUCOSE IN THE NORTH PACIFIC.
 
Seawater incubations were carried out to investigate the effect of abundance of inorganic N and P on water column bacterial assimilation of carbon compounds and bacterial growth at a series of stations across the nutrient gradient between the nutrient poor North Pacific gyre and the nutrient rich Polar Gyre. Ambient concentrations of free glucose and combined neutral aldoses were determined. Incubations with seawater samples from varying depths were carried out at 6 stations across the gradient with tritium-labeled glucose and leucine and varying additions of nitrate, ammonium and phosphate. Preliminary results indicate samples from the northern, nutrient rich end of the transect have low concentrations of combined neutral aldoses, high glucose assimilation rates and high bacterial production. Glucose uptake and bacterial production in samples from the northern end of the transect increased when inorganic nutrients were added to the incubation. The variations in ambient concentrations of combined neutral aldoses, combined with the variations in nutrient concentrations, bacterial growth and glucose uptake indicate that microbial assimilation of N poor organic material depend on the ambient inorganic N concentration.
 
Day: Thursday, Feb. 4
Time: 09:30 - 09:45am
Location: Sweeney Center
 
Code: SS33TH0930S