CS16 Harmful Algal Blooms
Date: Wednesday, June 12, 2002
Location: Poster Session - VCC
 
KanaTM, Horn Point Laboratory, U of Maryland, Cambridge, MD, USA, kana@hpl.umces.edu
Lomas, M, W, Bermuda Biological Station for Research, St. Georges, Bermuda, mlomas@bbsr.edu
MacIntyre, H, L, Horn Point Laboratory, Cambridge, MD, USA, macintyr@hpl.umces.edu
Cornwell, J, C, Horn Point Laboratory, Cambridge, MD, USA, cornwell@hpl.umces.edu
Gobler, C, J, Southampton College, Southampton, NY, USA, cgobler@southampton.liu.edu
 
STIMULATION OF A BROWN TIDE ORGANISM, AUREOCOCCUS ANOPHAGEFFERENS, BY SELECTIVE NUTRIENT ADDITIONS TO IN SITU MESOCOSMS
image
The influence of nutrient additions and sediment exchange on Aureococcus anophagefferens growth was studied using triplicate 200 liter floating-collar mesocosms deployed at the Southampton College Marine Science Center in Long Island, New York. A. anophagefferens density increased in treatments containing urea plus glucose, stressed Enteromorpha tissue, and a sediment layer. No increase was observed in the nitrate treatment or control mesocosms. During the 10 day experiment, A. anophagefferens net growth was restricted to the last three days, which corresponded to a change in weather from cloudy/rainy to sunny. During the cloudy period, phytoplankton biomass declined in all treatments indicating overall light limitation of phytoplankton growth. During the sunny period, 4-5 fold increases in phytoplankton biomass were observed in the nitrate and urea treatments. A. anophagefferens increased relative to total phytoplankton biomass (Chl basis) in all but the nitrate treatment and control. The greatest increase occurred in the Enteromorpha treatment. Results are consistent with a prevailing hypothesis that organic nitrogen nutrients favor the growth of A. anophagefferens.