Size Distribution and Activity of Marine Microheterotrophs

Publication Type:Journal Article
Year of Publication:1977
Authors:Azam, F, Hodson, RE
Journal:Limnology and Oceanography
Date Published:1977
ISBN Number:00243590
Keywords:Fringillidae, Serinus, Serinus serinus
Abstract:Natural populations of marine heterotrophic microorganisms in a variety of water masses were size fractionated with Nuclepore filters in a range of pore diameters of $0.1-8\mum.$ About 90% of the heterotrophic assimilation of 3H-labeled substrates (D-glucose, acetate, and L-serine) was by organisms that pass through $1-\mum$ filters; essentially all heterotrophic activity was by organisms passing through $5-\mum$ filters. The $1-\mum$ filterable fraction contained bacteria and, in some seawater samples, microflagellates. About 90% of the microbial heterotrophic activity in the seawater samples examined was due to those microorganisms (presumably bacteria) that are unattached to larger particulate material.
Short Title:Limnology and Oceanography
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