Ostroumov, S. A.. Moscow State University, saostro@glas.apc.org
, . A.. ,

 
THE ABILITY OF MUSSELS TO FILTER AND PURIFY THE SEA WATER IS INHIBITED BY SURFACTANTS
 
Filter-feeders remove suspended matter from the water column, which has many consequenses for the ecosystem functioning (Ostroumov et al., 1997). Filter-feeding is connected with removing phytoplankton and excreting pellets which sediment onto the sea bottom and contribute to the biogeochemistry of carbon. Effects of the surfactant, sodium dodecyl sulphate (SDS), on the filtering rate of Mytilus edulis were studied (Ostroumov, Donkin, in preparation). Aliquats of the suspension of algae Isochrysis galbana were added to the beakers with the mussels and the seawater and the filtering activity was measured by counting the algal cell density with 30-minute intervals. The inhibitory effects of SDS on the clearance rate of mussels were described within the concentration range 1-5 mg/L. At the initial concentration of SDS 1 mg/L the cell density was 135 % of that in control, at 2 mg/L - 198 % of that in control (following the first 30-min period of filtering). During the next time period, the inhibitory effects were also pronounced. Similar effects of the non-ionic surfactant Triton X-100 were found. The conclusion is made that the surfactants, through the inhibition of the filtering activity of mussels, may decrease the natural ability of aquatic ecosystems for self-purification.
 
Day: Monday, Feb. 1
Time: 04:45 - 05:00pm
Location: Hilton of Santa Fe
 
Code: SS06MO0445H