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Suspended POC and protozoans

Free-living bacteria (archaea?). CO 2. DOC. Sinking POC. DOC. Attached bacteria. CO 2. Suspended POC and protozoans. Microbial metabolism. Zooplankton metabolism. Sinking POC. Zooplankton. Physical mixing. Gravity. Swimming. Flux larger than expected?. Flux about equal.

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Suspended POC and protozoans

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  1. Free-living bacteria (archaea?) CO2 DOC Sinking POC DOC Attached bacteria CO2 Suspended POC and protozoans Microbial metabolism Zooplankton metabolism Sinking POC Zooplankton Physical mixing Gravity Swimming Flux larger than expected? Flux about equal Mesopelagic zone dark microbial loop Carnivores Zooplankton dark microbial loop

  2. DAPI counts

  3. DAPI biomass C

  4. Bacterial production rates (BP) CF1 CF2 Thymidine Incorporation Rate (mol TdR / L / d) Bacterial Production Rate (g C / L / d) cell mol TdR g carbon cell X = X CF1 – 1 to 2 x 1018 cell (mol TdR)-1; 2 x 1018 is most common CF2 – 10 to 20 x 10-15 g (cell)-1; 15 x 10-15 is most common

  5. Bacterial Production

  6. Bacterial carbon demand (BCD) Bacterial Carbon Demand (g C / L / d) Bacterial Production Rate (g C / L / d) 1 BGE X = BGE – 0.10 to 0.15 (as low 0.05 Phil ETS ?; 0.15 is most common also global mean)

  7. Bacterial Carbon Demand

  8. Free-living bacteria (archaea?) CO2 DOC Sinking POC DOC Attached bacteria CO2 Suspended POC and protozoans Microbial metabolism Zooplankton metabolism Sinking POC Zooplankton Physical mixing Gravity Swimming Flux larger than expected? Flux about equal Mesopelagic zone dark microbial loop Carnivores Zooplankton dark microbial loop

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