CS17 Invasive Species
Date: Thursday, June 13, 2002
Time: 2:45:00 PM
Location: Sidney
 
FisherNS, Stony Brook University, Stony Brook, USA, nfisher@notes.cc.sunysb.edu
Baines, S, B, Stony Brook University, Stony Brook, USA, sbaines@notes.cc.sunysb.edu
Cole, J, J, Institute of Ecosystem Studies, Millbrook, USA, colej@ecostudies.org
 
UTILIZATION OF NATURAL DISSOLVED ORGANIC CARBON BY THE ZEBRA MUSSEL, DREISSENA POLYMORPHA
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There is evidence that zebra mussels can absorb appreciable amounts of labile dissolved organic matter from ambient water. This may account in part for the remarkable success of this invasive species. We tested the hypothesis that zebra mussels utilize natural dissolved organic matter, and that this utilization is metabolically important. Mussels were exposed to either 0.2-um filtered Hudson River water or artificial river water (deionized water with cations adjusted to resemble the Hudson). During the experiment the mussels were fed freeze-dried green algae grown on C-13 enriched DIC (del C-13 of algae = 200). Mussels in the Hudson River water increased weight by 0.3% over the month-long period, whereas mussels in the artificial river water without DOC lost 0.3% of their weight; differences were significant. Additionally, mortality of mussels in Hudson water was lower than in the artificial river water. We will use data on stable isotopic composition and glycogen content of mussel tissues to deduce, respectively, the amount of natural DOC incorporated by the mussels and the effect of the DOC exposure on the metabolic condition of the mussels.