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review: competition, nutrients, light critical depth spring bloom atlantic vs. pacific classic food web microbial loop

The environment varies in space and time. Different phytoplankton grow well under different conditions, so there is a seasonal succession in the plankton community.. Equal ?maxUnequal KsAt low N, Sp. 1 winsUnequal ?maxEqual KsAt high N, Sp. 2 winsUnequal ?maxUnequal KsAt low N, Sp. 1 winsAt high N, Sp. 2 wins.

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review: competition, nutrients, light critical depth spring bloom atlantic vs. pacific classic food web microbial loop

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    1. Review: Competition, nutrients, light Critical Depth Spring bloom Atlantic vs. Pacific Classic food web Microbial loop Eutrophic vs. Oligotrophic

    4. What was that stuff about different pigments?

    5. Review of Critical depth

    6. Review of Critical depth

    7. If critical depth > mixed layer depth, P>R

    8. If critical depth < mixed layer depth, P<R

    10. Atlantic vs. Pacific spring bloom

    12. Definitions Autotrophs get their carbon and energy from inorganic sources. Phytoplankton are autotrophs because they get their carbon from CO2 and energy from light. Heterotrophs get their carbon and energy from pre-formed organic matter. Zooplankton are heterotrophs because they get carbon and energy by eating phytoplankton. Eutrophic environments have high nutrient concentrations and high productivity. Coastal upwelling regions are Eutrophic. Oligotrophic environments have low nutrients and low productivity. Subtropical gyres (open ocean) are Oligotrophic.

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    15. Grazers in the ocean (Zooplankton)

    16. Traditional view of simple food web:Small things are eaten by bigger things

    17. Have to add heterotrophic bacteria, heterotrophic protists, autotrophic microbes

    18. Bacteria absorb organic molecules leaked by microbes and phytoplankton. This creates a microbial “loop.”

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    23. Biomass data from open-ocean Pacific

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    30. Organic matter has to get to the dump truck at the bottom of the ocean somehow. Dead cells and fecal pellets (plankton poop) sink. Big ones sink faster. Dissolved organic matter, pieces of gelatinous animals etc. stick together and form bigger “marine snow” that sinks.

    31. Bigger plankton sink faster and have bigger fecal pellets that sink faster

    32. TEP are formed indirectly from marine phytoplankton. Take a diatom for example, hanging out in the water column, taking in CO2, light and photosynthesizing. Not all of the organic carbon formed is incorporated into or used by the cell. A portion of this carbon to exuded as dissolved organic matter into the surrounding water. Here we have the beginnings of TEP. The molecules now mobile in the marine environment encounter one another randomly. Instead of glancing off one another, the molecules coalesce through cation bridging forming particulates. It is their chemistry that makes them sticky and able to bond with themselves and other particles in the water. TEP are formed indirectly from marine phytoplankton. Take a diatom for example, hanging out in the water column, taking in CO2, light and photosynthesizing. Not all of the organic carbon formed is incorporated into or used by the cell. A portion of this carbon to exuded as dissolved organic matter into the surrounding water. Here we have the beginnings of TEP. The molecules now mobile in the marine environment encounter one another randomly. Instead of glancing off one another, the molecules coalesce through cation bridging forming particulates. It is their chemistry that makes them sticky and able to bond with themselves and other particles in the water.

    33. Filtering is the current method by which TEP particles are captured and measured. Visuals of TEP and TEP interacting with other particles such as cells can be aquired by taking the sample stained on a filter and transferring it into a gel matrix on a slide. The filter is pressed sample side down into the gel on the slide. The filter is ten peeled off leaving the stained sample behind. Add some preservative and a cover glass and your slide is ready to be examined. Under the microscope you can get some pretty wonderful pictures. Here are two different aggregates I captured last semester during some lab work under Sasha Tozzi. You can see that there are two major constituents, the cells and a blue material, TEP. The two are distinct, you can see that the cells are not stained, only the extracellular material.Filtering is the current method by which TEP particles are captured and measured. Visuals of TEP and TEP interacting with other particles such as cells can be aquired by taking the sample stained on a filter and transferring it into a gel matrix on a slide. The filter is pressed sample side down into the gel on the slide. The filter is ten peeled off leaving the stained sample behind. Add some preservative and a cover glass and your slide is ready to be examined. Under the microscope you can get some pretty wonderful pictures. Here are two different aggregates I captured last semester during some lab work under Sasha Tozzi. You can see that there are two major constituents, the cells and a blue material, TEP. The two are distinct, you can see that the cells are not stained, only the extracellular material.

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