Chemical studies in experimental enclosures (CBEs) showed that a large percentage of added copper was lost from the water. The quantity associated with settlement material was a small percentage of that lost. Loss by settlement, however, appeared to be directly proportional to the level
of primary production, and was significantly correlated with carbon and to the concentration of soluble copper added. Copper:carbon ratios were higher in samples which consisted mainly of fecal pellets than in those constituted mainly of intact or fragmented phytoplankton.
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