Journal of the Marine Biological Association of the United Kingdom

Research Article

The significance of dissolved organic compounds in the nutrition of Siboglinum ekmani and other small species of Pogonophora

A. J. Southwarda1 and Eve C. Southwarda1

a1 The Laboratory, Marine Biological Association, Citadel Hill, Plymouth

Siboglinum ekmani can accumulate labelled alanine, glycine, phenylalanine, glutamic acid, galactose, glucose, mannose, acetic acid, palmitic acid, lactic acid and glycollic acid from sea water at concentrations between 1 and 100 μM/1. Uptake of fructose and mannitol was not detected. The neutral amino acids were absorbed against a concentration gradient, probably by a carrier-mediated transport mechanism, and similar mechanisms may exist for acidic amino acids and glucose. Most of the compounds entered into the metabolism, but 90% of the glycine accumulated was retained as free amino acid. The presence of glucose appeared to depress uptake of alanine, but uptake of glucose was stimulated by alanine.