Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Volume 13, issue 16
Biogeosciences, 13, 4767-4775, 2016
https://doi.org/10.5194/bg-13-4767-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 13, 4767-4775, 2016
https://doi.org/10.5194/bg-13-4767-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 23 Aug 2016

Research article | 23 Aug 2016

Effect of the silica content of diatom prey on the production, decomposition and sinking of fecal pellets of the copepod Calanus sinicus

Hongbin Liu and Chih-Jung Wu Hongbin Liu and Chih-Jung Wu
  • Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

Abstract. The effects of changing the amount of silica in the cell wall of diatom prey, on the production, decomposition rate and sinking velocity of fecal pellets of the calanoid copepod, Calanus sinicus, were examined. Using different light intensities to control the growth of the diatom Thalassiosira weissflogii also led to the accumulation of different amounts of biogenic silica. Copepods were then fed either low ( ∼ 1600cellsL−1) or high ( ∼ 8000cellsL−1) concentrations of this diatom. Copepods fed a high concentration of diatoms with high-silica content exhibited a lower grazing rate and lower fecal pellet production rate than those fed a high concentration of diatoms with low-silica content. However, there was no difference in either the grazing or fecal pellet production rates at low prey concentrations with high- or low-silica content. The size of the fecal pellets produced was only affected by the prey concentration, and not by the silica content of prey. In addition, the degradation rate of the fecal pellets was much higher for copepods fed a low-silica diet than for those fed a high-silica diet. Significantly lower densities and sinking rates only occurred in the fecal pellets of copepods fed a low-silica diet and a low prey concentration. Calculating the L ratio (the ratio of degradation rate:sinking rate) for each group indicated that the fecal pellets produced by copepods fed highly silicified diatoms are likely to transport both biogenic silica and organic carbon to the deep layer, whereas those produced following the consumption of low-silica diatoms are likely to decompose in the mixing layer.

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The transport of organic C from the surface to the deep ocean by sinking particles composed of remains of dead cells and zooplankton fecal pellets can reduce the atmospheric CO2. Study of the effect of the silica content of diatoms, one of the most important primary products, on the production, degradation and sinking of its fecal pellets provides a better understanding of the complexity and variability of the planktonic food web and its implication on the vertical flux of C in the global ocean.
The transport of organic C from the surface to the deep ocean by sinking particles composed of...
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