Open Oceans: Pelagic Ecosystems III - PowerPoint PPT Presentation

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Open Oceans: Pelagic Ecosystems III

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  1. Open Oceans: Pelagic Ecosystems III

  2. Comparing the makeup of water and plankton • Mean Elemental Ratios of N, and P • Organisms: 16.0N / 1P • Sea Water: 14.7N / 1P • On average, seawater lacks sufficient organic N to take advantage of the available phosphorus

  3. Limited water mixing further limits nutrient availability

  4. Testing models: measuring plankton in open oceans • Techniques for studying plankton consumers • Plankton levels may be dropping (NASA study)

  5. Changes in Productivity

  6. From productivity to food webs: A size-based pelagic food web

  7. Grazing pressure

  8. Limits & Flows of NPP

  9. Marine “Snow” krill

  10. A spatially realistic pelagic food web

  11. What are links among trophic levels in pelagic systems?

  12. Large phytoplankton vary with depth

  13. Nutrient distribution with depth

  14. Distribution of food web biomass

  15. The global nitrogen cycle

  16. Influences on biologically useful Nitrogen

  17. Diatom mats can migrate vertically

  18. Consequences of active transport of NO3

  19. Links to oceanic nekton