Premium
Uptake of dissolved organic matter (DOM) and its importance to metabolic requirements of the zebra mussel, Dreissena polymorpha
Author(s) -
Baines Stephen B.,
Fisher Nicholas S.,
Cole Jonathan J.
Publication year - 2005
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.2005.50.1.0036
Subject(s) - dreissena , zebra mussel , monosaccharide , amino acid , dissolved organic carbon , chemistry , biochemistry , mussel , substrate (aquarium) , fatty acid , environmental chemistry , bivalvia , chromatography , food science , biology , ecology , mollusca
We determined the rates at which Dreissena polymorpha assimilated radiolabeled acetate, monosaccharides, amino acids, and fatty acids at environmental concentration levels. The mussels incorporated all of the substances presented to them. Much of the 14 C‐labeled substrate that was taken up was respired to 14 CO 2 , indicating that the substrates were used for metabolic purposes. Nonacidic amino acids and fatty acids were taken up fastest, with absorption efficiencies (AE, percentage of filtered substrate removed) of 13% and 85%, respectively. The AEs for monosaccharides (1.5%), acetate (0.2%), and the acidic amino acid glutamic acid (0.79%) were much lower. Among the nonacidic amino acids, nonpolar forms (AE = 19.5%) were preferred over basic and polar neutral forms (AE = 9.3%). On the basis of direct measurements of free amino acid concentrations and literature estimates of free sugars, acetate, and short‐chain fatty acids in surface waters, we estimated that direct uptake of these monomers amounts to ~10–25% of the zebra mussel maintenance ration. Direct uptake of dissolved organic matter might be metabolically significant to zebra mussels.