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Effect of High CO 2 on Photosynthesis and Growth in Marine Phytoplankton Daniel Steurer Morel Lab, Summer 2011.

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Presentation on theme: "Effect of High CO 2 on Photosynthesis and Growth in Marine Phytoplankton Daniel Steurer Morel Lab, Summer 2011."— Presentation transcript:

1 Effect of High CO 2 on Photosynthesis and Growth in Marine Phytoplankton Daniel Steurer Morel Lab, Summer 2011

2 Trichodesmium Oceanic, non-heterocystous cyanobacteria Varies from other diazotrophs Major player in oceanic nitrogen fixation Primarily located in tropical and sub-tropical oceans Diurnal, following circadian rhythm in nitrogen fixation

3 The Issue Fe’ in YBC II = ~200nM Fe’ in GSW = ~1250pM

4 Varying EDTA

5 Conclusions Varying EDTA levels has a large effect on growth rate of Trichodesmium in YBC II medium EDTA chelates potentially toxic ions in the relatively ‘dirty’ medium – e.g. copper YBC II obviously has some previously unnoticed detriments to growth Other potential unknown effects of the medium could exist

6 Kranz, 2010 Shown: higher pCO 2 yields higher N 2 fixation rate in both instances *Grown in YBC II

7 Shi and Morel, in prep. Shown: higher pCO 2 yields lower N 2 fixation rate in both instances *Grown in GSW

8 Results / Analysis Nanomoles Fe/ug Chlorophyll a 0.41684586 0.44022874 0.31428607 0.41893009 MeanStandard Deviation 0.3980.057 YBC II, Fe’ = ~200nM GSW, Fe’ = ~1250 pM Nanomoles Fe/ug Chlorophyll a Mean Standard Deviation 3.0670.377 Clearly, the iron imbalance outside of the cells is not mimicked within the cells.

9 Thanks to… Dalin Shi Francois Morel and co. Princeton Environmental Institute

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