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Journal of Plankton Research, Vol 21, 1791-1798, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

Short communication. Influence of light intensity on the ingestion rate of a marine ciliate, Lohmanniella sp

K Chen and J Chang
Institute of Marine Biology, National Taiwan Ocean University, Keelung 202-24, Taiwan, Republic of China; Corresponding author

Using fluorescently labeled algae (FLA) as food particles, the ingestion rate of an oligotrichous ciliate, Lohmanniella sp., was 0.4 FLA ciliate-1 min-1 in the dark, but decreased to 0.07 FLA ciliate-1 min-1 when illuminated at 115 s-1 m-2. When the light was abruptly switched on or off, changes in ingestion rate were immediate with no delay. These results suggest that the effect of light may have to be considered in the experimental design when measuring ciliate feeding rates in marine environments.
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