Uptake and utilization of 'colloidal DOM' by heterotrophic flagellates in seawater Public Deposited

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  • A variety of macromolecules labeled with FITC (fluorescein isothiocyanate), including carbohydrates (dextran) and proteins (ferritin, casein, albumin, concavalin A), spanning a range of molecular weights from 55 to 2000 kD, were actively ingested by marine heterotrophic flagellates at substrate concentrations of 1 to 10 mg/L. The uptake capacity for the macromolecules was positively correlated to clearance rate for bacterial-sized prey Ingested FITC appeared In the food vacuoles of the cells The biomass of a cultured bacterivorous flagellate species Increased in cultures amended with 10 mg of 2000 kD dextran/L to an extent that could not be explained by bacterivory However. 40 kD devtran did not stimulate flagellate growth On the basis of these results, we suggest that protists have the capacity to ingest colloids of widely different sizes, spanning the size range of bacteria and larger organisms to macromolecules possibly including the recently discovered abundant non-living submicrometer colloids in sea water.
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  • Tranvik, L. J., Sherr, E. B., & Sherr, B. F. (1993). Uptake and utilization of 'colloidal DOM' by heterotrophic flagellates in seawater. Marine Ecology Progress Series, 92, 301-309.
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