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Microbial vs. zooplankton control of sinking particle flux in the ocean ’ s twilight zone

Microbial vs. zooplankton control of sinking particle flux in the ocean ’ s twilight zone. Ladies and gentleman…. Deborah K. Steinberg, Benjamin A. S. Van Mooy, Ken O. Buesseler, Philip W. Boyd, Toru Kobari, David M. Karl. In the blue corner. In the red corner. Conceptual diagram.

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Microbial vs. zooplankton control of sinking particle flux in the ocean ’ s twilight zone

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  1. Microbial vs. zooplankton control of sinking particle flux in the ocean’s twilight zone Ladies and gentleman… Deborah K. Steinberg, Benjamin A. S. Van Mooy, Ken O. Buesseler, Philip W. Boyd, Toru Kobari, David M. Karl In the blue corner In the red corner

  2. Conceptual diagram Supplementary figure 1.

  3. Bacteria a. ALOHA b. K2 Supplementary figure 2.

  4. Zooplankton a. ALOHA Deployment 1 ALOHA Deployment 2 b. K2 Deployment 1 K2 Deployment 2 Supplementary figure 3.

  5. Bacteria conversions

  6. Bacteria conversions What we measured: Bacteria production (BP) Bacterial respiration= (1-BGE)/ BGE*BP Bacterial C demand= BP/ BGE Thymidine conversion factor 1.0 - 2.0 x 1018 cells mole-1 Carbon conversion factor of 15 fg C cell-1 Bacteria Growth efficiency (BGE) 0.1 - 0.15 for open-ocean bacteria (Phil- ETS activity at ALOHA = 0.05 - 0.11) Sensitivity analysis Middle: 2.0 x 1018 cells mole & BGE of 0.15 Lower: 1.0 x 1018 cells mole& BGE of 0.15 Upper : 2.0 x 1018 cells mole& BGE of 0.1

  7. Determine zooplankton biomass in depth zone Zooplankton conversions Zooplankton Respiration (ZR) CH20 + O2 CO2 + H20 ln (O2 consumption)= -0.399 + 0.801 ln (body weight) + 0.069 (temp) (Ikeda et al. 1985) Zooplankton C demand (ZCD) ZCD= ZR/ R * AE Sensitivity analysis: Middle: AE = 60% Lower: AE = 70% Upper : AE = 50%

  8. Deployment 1 ALOHA Deployment 2 Figure 1.

  9. Deployment 1 K2 Deployment 2 Figure 2.

  10. Vertical Migratory flux

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