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Grazing of female copepods, Acartia clausi and Temora longicornis, on the large centric diatom Coscinodiscus wailesii, was studied in the laboratory. While A. clausi females did not feed on C. wailesii, T. longicornis showed a skilful handling of these large algae. The cells were not completely ingested but copepods bit a small piece out of the silica wall and then ingested the cell content only. Faecal pellet analyses showed little remains of the silica walls, and most of the content could only be classified as undefined matter. Therefore the general analyses of faecal pellets and gut content of copepods from the field must be interpreted with caution.

Copepods grazing on Coscinodiscus wailesii: a question of size?