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Amino-acid uptake by mussels,Mytilus edulis, from natural sea water in a flow-through system
Helgoländer Meeresuntersuchungen volume 38, pages 189–199 (1984)
Abstract
Natural Wadden Sea water taken from the North Sea (island of Sylt) was pumped at rates of 150 and 300 l h−1 through a 4 l plexiglass tube mounted on a wooden tripod on the beach. The tube was densely filled with numerous cleaned mussels,Mytilus edulis. HPLC analysis of sea water showed that total dissolved amino acids are patchily distributed, varying by 100 % within 15 min, though proportions of individual amino acids were remarkably constant. Total amino-acid concentrations were 1528±669 nM (N=3) in October 1983 and 1198±597 nM (N=7) in July 1984. Samples taken at the entrance and the outlet of the experimental mussel bed revealed that the mussels had taken up 29 to 66 % of the amino acids dissolved in sea water. Uptake was observed for all amino acids detected in the chromatograms. 78 % of uptake resulted from the 5 most concentrated amino acids: serine, alanine, glycine/threonine, ornithine, aspartic acid. The nutritional profit obtained from uptake of dissolved amino acids amounted to 12 % (N=5, range 5–23 %, flow rate 150 l h−1) and to 24 % (N=3, range 13–38 %, flow rate 300 l h−1) of metabolic rate. The present data suggest that amino-acid concentration predominantly determines the magnitude of the nutritional profit obtained from uptake, and to a smaller extent the flow rate. These findings are in contrast to results of previous studies onAsterias rubens, interacting in small-volume closed systems with the natural bacterial sea water flora (Siebers, 1982). In these experiments, bacteria, due to rapid uptake, outcompeted the sea stars in absorption of dissolved amino acids. The present results suggest that bivalve mussels, can, due to their large gill surface areas and the great amounts of water pumped through their mantle cavity, successfully compete with bacteria in uptake of dissolved organic matter. Mussels, therefore, suggestedly play an important role in cycling dissolved organic matter.
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Siebers, D., Winkler, A. Amino-acid uptake by mussels,Mytilus edulis, from natural sea water in a flow-through system. Helgolander Meeresunters 38, 189–199 (1984). https://doi.org/10.1007/BF01999966
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DOI: https://doi.org/10.1007/BF01999966