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Nianzhi (George) Jiao, Yao Zhang Xiamen University China

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

    subarctic (K2) v.s. subtropical (Aloha similar)

    ---------------------------------------------- Nianzhi (George) Jiao, Yao ZhangXiamen University China

  • Investigation SitesFig. 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.

  • Picoplankton discrimination by FCMProchlorococcusSynechococcusPicoeukaryotesHeterotrophic bacteria

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

  • Paths of PhotosynthesisKarl, 2002

  • SunlightPhtosynthesis in PhytoplanktonPhtosynthesisin AAPBC fixationATP

    Save OC

    Ocean C cyclingRe-budget ??

    respiration consumption

  • Carbon cycling

  • TEM-Ultrathin sections SEM dc10-sdg26-y-1(2216) dc10-sdc10-s db6-y-2(0.2) TEM-Negatively stained cells AAPB cells

  • Non-AAPBAAPBciliatesMeso-zooplankton

    flagellates

    ciliates

    flagellates

    Meso-zooplanktonCellular contribution to sinking flux in AAPB could also be higher than non-AAPB

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

  • 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.

  • Picoplankton Carbon Biomass at K2Fig. 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.

  • Comparison between K2 and Aloha similarsFig. 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.

  • Pico- biomass K2 v.s. NWPGFig. 6 Vertical distribution of pico-sized autotrophic and heterotrophic carbon biomass at K2 and NWPG1Surface layer: Auto > hetero Auto < heteroTwilight zone: Auto < hetero Auto > heteroGyreK2

  • Comparison along longitudeFig. 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.

  • NEP1, 2 ,3,4Auto fraction increased eastwardVertical distibution of pico-sized autotrophic and heterotrophic carbon biomass at NEP

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

  • NEP4 (1,2,3,4) K2 (1,2) in terms of Biomass flux and auto/hetero ratio; although composition are different Vertical distribution of pico-sized autotrophic and heterotrophic carbon biomass at NEP4Depth profiles ofpico-sized autotrophic and heterotrophic carbon biomass at K2

  • Two dimensional trends

  • ConclusionsPicoeukaryoes 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

  • Cheers!K2 Aloha

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