Meon, B. University of Delaware, bmeon@udel.edu
Kirchman, D. University of Delaware, kirchman@udel.edu

 
DYNAMICS OF FREE AND COMBINED AMINO ACIDS AND CARBOHYDRATES DURING AN EXPERIMENTAL PHYTOPLANKTON BLOOM
 
As a consequence of the rapid changes in primary production and algal biomass, blooms are likely to produce changes in the amount and composition of dissolved organic carbon (DOC) due to exudation products of algae, sloppy feeding by zooplankton and viral lysis. Yet data showing these changes in the DOC pool at a molecular level are scarce. We will present data on the dynamics of dissolved free and combined amino acids and carbohydrates during an experimental phytoplankton bloom in mesocosms with and without the addition of zooplankton. Preliminary analysis indicate that dissolved free amino acid dynamics were uncoupled from those of DOC. Dissolved free amino acids increased from < 0.1 uM to 4.2 uM within 6 days after the start of the experiment followed by a decrease to < 0.85 uM during the following 6 days. DOC increased steadily but varied much less, ranging between 131 uM (day 0) and 273 uM (day 12). Bacterial production during the study increased by approximately a factor of six. These data indicate that algal blooms rapidly influence both qualitatively and quantitatively the DOC pool and thus the availability of organic carbon for heterotrophic bacterial growth.
 
Day: Thursday, Feb. 4
Time: 08:45 - 09:00am
Location: Sweeney Center
 
Code: SS33TH0845S