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The content of suspended and sedimented copepod faecal pellets in relation to phytoplankton stocks was investigated in Kiel Bight in summer 1986. Sedimentation rates of faecal pellets were also measured using sediment traps. Parallel to the field investigation, incubations were conducted in which the dominant copepods, Acartia sp. and Centropages hamatus, were fed with natural phytoplankton Faecal pellets from field san~ples and laboratory experiments were analyzed by scanning electron microscopy. Results showed a strong relationship between the composition of ambient food supply, ingested phytoplankton and faecal pellet content. In addition, faecal pellet sedimentation rates in July and August (4400 and 7700 m-' d-' respectively) differed from those in September (168 000 m-' d-'). This was attributed to the change in phytoplankton composition, which consisted mainly of athecate flagellates in July and August but was dominated in September by Prorocentrum minimum, a thecate dinoflagellate.

Content of copepod faecal pellets in relation to food supply in Kiel Bight and its effect on sedimentation rate