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Recent procedures for quanhfying the ingestion of non-nutritive bacterial sized particles by bacterivores lack the necessary resolution for the accurate determination of ingestion rates. Here, we descnbe how the filter-transfer-freeze procedure of Hewes & Holm-Hansen (1983) permits concomitant epifluorescence and phase contrast microscopy which lets us unambiguously discriminate between lngested and non-ingested fluorescent microspheres (FM) in 4 specles of apochlorotic nanoflagellates. This rapid procedure reduces the subjectivity of grazing rate determlnations while improving precision. We have used this procedure to observe non-continuous feeding, egestion processes and the effect of growth inhibition on phagotrophy.

marine ecology. progress series

Unambiguous detection and improved quantification of phagotrophy in apochlorotic nanoflagellates using fluorescent microspheres and concomitant phase contrast and epifluorescence microscopy