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Nianzhi (George) Jiao, Yao Zhang Xiamen University China

Picoplankton Community Structure subarctic (K2) v.s. subtropical (Aloha similar) ----------------------------------------------. Nianzhi (George) Jiao, Yao Zhang Xiamen University China. Investigation Sites. Fig. 1 Sampling stations

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Nianzhi (George) Jiao, Yao Zhang Xiamen University China

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  1. Picoplankton Community Structuresubarctic (K2)v.s. subtropical (Aloha similar)---------------------------------------------- Nianzhi (George) Jiao, Yao Zhang Xiamen University China

  2. Investigation Sites Fig. 1 Sampling stations Chlorophyll a remote images (Aqua-MODIS) of August 2005 were employed as the backgrounds. NWPG: North Western Pacific; NEP: North Eastern Pacific; MNEP: Marginal sea of North Eastern Pacific.

  3. Picoplankton discrimination by FCM Picoeukaryotes Heterotrophic bacteria Prochlorococcus Synechococcus

  4. AAPB (aerobic anoxygenic phototrophic bacteria) TIREM Jiao et al., 2006,Journal of Microbiological Methods

  5. Paths of Photosynthesis Karl, 2002

  6. C fixation Phtosynthesis in Phytoplankton Sunlight ATP Phtosynthesis in AAPB respiration consumption Save OC Ocean C cycling Re-budget ??

  7. Carbon cycling

  8. AAPB cells dg26-y-1(2216) db6-y-2(0.2) SEM TEM-Negatively stained cells dc10-s dc10-s dc10-s TEM-Ultrathin sections

  9. Cellular contribution to sinking flux in AAPB could also be higher than non-AAPB Non-AAPB flagellates ciliates Meso-zooplankton flagellates AAPB ciliates Meso-zooplankton

  10. Deployment 1 Deployment 2 Depth profiles of the abundance (upper) And biomass (lower) of picoplankton at K2.

  11. Fig. 4 Depth profiles of picoplankton at K2 with false connection down to 200m. The data of 60-200m are adopted from Liu et al. 2002.

  12. Picoplankton Carbon Biomass at K2 Fig. 5 Depth profiles of pico-sized autotrophic and heterotrophic carbon biomass at K2. The data of 60-200m (shaded) were from Liu et al. 2002.

  13. Comparison between K2 and Aloha similars Fig. 1 Sampling stations Chlorophyll a remote images (Aqua-MODIS) of August 2005 were employed as the backgrounds. NWPG: North Western Pacific; NEP: North Eastern Pacific; MNEP: Marginal sea of North Eastern Pacific.

  14. Pico- biomassK2 v.s. NWPG Gyre K2 Surface layer: Auto > hetero Auto < hetero Twilight zone: Auto < hetero Auto > hetero Fig. 6 Vertical distribution of pico-sized autotrophic and heterotrophic carbon biomass at K2 and NWPG1

  15. Comparison along longitude Fig. 1 Sampling stations Chlorophyll a remote images (Aqua-MODIS) of August 2005 were employed as the backgrounds. NWPG: North Western Pacific; NEP: North Eastern Pacific; MNEP: Marginal sea of North Eastern Pacific.

  16. NEP1, 2 ,3,4Auto –fraction increased eastward Vertical distibution of pico-sized autotrophic and heterotrophic carbon biomass at NEP

  17. Fig. 10 Variation of vertical profiles of pico-sized autotrophic and heterotrophic carbon biomass along longitude

  18. NEP4 (1,2,3,4) <=> K2 (1,2) in terms ofBiomass flux and auto/hetero ratio; although composition are different Vertical distribution of pico-sized autotrophic and heterotrophic carbon biomass at NEP4 Depth profiles of pico-sized autotrophic and heterotrophic carbon biomass at K2

  19. Two dimensional trends

  20. Conclusions • Picoeukaryoes and Synechococcus dominate carbon biomass of pico-autotrophs at K2 • Prochlorococcus dominate carbon biomass of pico-autotrophs at low latitudes especially in the oligotrophic areas. • AAPB are more abundant in entrophic waters than in oligotrphic waters • picoplankton carbon flux maximum layer depth eutrophic waters: 50-75m oligotrophic waters: 100-150m • Temperature and nutrients are two major controlling factors • Variations along gradients: autotrophs >> heterotrophic bacteria • Therefore whether or not a province is autotrophic or heterotrophic is determined primarily by autotrophs

  21. K2Aloha Cheers!

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