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In subtropical Hawaiian waters, about 80 % of total chlorophyll and about 60 % of C, N, P, and Si occur in the <5 @m fraction. This predominance of chlorophyll in the <5 pm fraction prevails throughout the photic zone in extensive areas of the North Central Pacific Ocean. Sinking rates of various constituents reveal vertical, size-related, and day:night differences. In the deep chlorophyll layer, sinking rates were lower than those in the upper mixed layer. Flux estimates indicated that sedimentation accounted for about 7 % of daily photosynthetic carbon production, and that particles 120 pm accounted for most of the microparticulate C, N, P, and Si flux. Calculations showed that constituent turnover rates from sedimentary loss alone are < l % of other biological rate processes influencing the concentrations of these constituents (e.g. growth rate]. These findings indicate that sedimentation losses from the photic zone resulting from the sinking of intact phytoplankton and/or suspended microparticulates are of comparatively minor importance to the time-dependent changes of phytoplankton biomass in subtropical waters.

Size structure and sinking rates of various microparticulate constituents in oligotrophic Hawaiian waters