海洋微生物群集の捕食過程における有機物代謝に関する研究 (1994年度日本海洋学会岡田賞受賞記念講演)

概要

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In marine ecosystems, a substantial fraction of primary production passes through the dissolved organic matter (DOM) → bacteria → protozoa pathway. However, little is known about the mechanism (s) of the production of DOM. We examined whether or not heterotrophic flagellates release DOM. Our experiments revealed that flagellates release both monomeric labile DOM (e.g. dissolved free amino acids) and colloidal particles as a result of egestion of incompletely digested or unassimilated prey materials. "Micro fecal pellets" produced by flagellates appeared to be colloidal "liposomes" composed of prey bacterial membranes, flagellate digestive enzymes and probably other DOM from bacteria. We suggest that the release of DOM by flagellates has substantial implications for several important biogeochemical processes including ocean food webs, formation of refractory DOM, and sinking particle fluxes.
日本海洋学会の論文
1994-12-30