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Antarctic choanoflagellates ingest fluorescent latex microspheres over the size range 0.063 to 1.0 pm. They also ingest fluorescently labelled dextrans over the molecular weight range of 4 X 103 to 2 X 10' daltons. Calculations based on clearance rates and their abundance indicate that choanoflagellates in Antarctic coastal waters clear around 7 % of the water column per day. They are likely to be involved in the direct transfer of energy from sub-micrometre particles and high molecular weight dissolved organic material to krill and other grazing invertebrates.

Uptake of sub-micrometre particles and dissolved organic materal by Antarctic choanoflagellates