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The effects of changing the amount of silica in the cell wall of diatomprey, on the production, decomposition rate and sinking velocity of fecalpellets of the calanoid copepod, Calanus sinicus, were examined. Using different lightintensities to control the growth of the diatom Thalassiosira weissflogii also led to the accumulationof different amounts of biogenic silica. Copepods were then fed eitherlow ( ∼  1600 cells L−1) or high ( ∼  8000 cells L−1) concentrations of this diatom. Copepods fed a highconcentration of diatoms with high-silica content exhibited a lower grazingrate and lower fecal pellet production rate than those fed a highconcentration of diatoms with low-silica content. However, there was nodifference in either the grazing or fecal pellet production rates at lowprey concentrations with high- or low-silica content. The size of the fecalpellets produced was only affected by the prey concentration, and not by thesilica content of prey. In addition, the degradation rate of the fecalpellets was much higher for copepods fed a low-silica diet than for thosefed a high-silica diet. Significantly lower densities and sinking ratesonly occurred in the fecal pellets of copepods fed a low-silica diet and alow prey concentration. Calculating the L ratio (the ratio of degradationrate : sinking rate) for each group indicated that the fecal pellets producedby copepods fed highly silicified diatoms are likely to transport bothbiogenic silica and organic carbon to the deep layer, whereas those producedfollowing the consumption of low-silica diatoms are likely to decompose inthe mixing layer

biogeosciences

Effect of the silica content of diatom prey on the production, decomposition and sinking of fecal pellets of the copepod &amp;lt;i&amp;gt;Calanus sinicus&amp;lt;/i&amp;gt;