1 / 9

Effect of High CO 2 on Photosynthesis and Growth in Marine Phytoplankton

Effect of High CO 2 on Photosynthesis and Growth in Marine Phytoplankton. Daniel Steurer Morel Lab, Summer 2011. Trichodesmium. Oceanic, non- heterocystous cyanobacteria Varies from other diazotrophs Major player in oceanic nitrogen fixation

jessenia
Download Presentation

Effect of High CO 2 on Photosynthesis and Growth in Marine Phytoplankton

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Effect of High CO2 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. Shown: higher pCO2 yields higher N2 fixation rate in both instances *Grown in YBC II Kranz, 2010

  7. Shown: higher pCO2 yields lower N2 fixation rate in both instances *Grown in GSW Shi and Morel, in prep.

  8. Results / Analysis YBC II, Fe’ = ~200nM Clearly, the iron imbalance outside of the cells is not mimicked within the cells. GSW, Fe’ = ~1250 pM

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

More Related