quiz
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| *What does HNLC stand for? | High nitrate, low chlorophyll
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| *Describe the phytoplankton community response to iron addition in IronEx II | diatom increased in growth and biomass, huge spike, composition changes from cyanobacteria to diatom
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| *Describe bottom-up and top-down control in the enriched patch in IronExII. | bottom-up: cell division rates limited by iron, diatoms and other phytoplankton increased b/c of slow reproduction and development of their mesozooplankton grazers; Top-down: micrograzers could keep up with increase of cyanobacterium and control
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| What was the natural source of iron to euphotic waters discussed in class? | plume of dust from Alaskan glacial sediments, or from vast deserts like Sahara; dust storm
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| Why did it take primary production longer to peak in Soiree than in IronEx II? | b/c of temp of different bodies of water, polar and tropical
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| *Why did the phytoplankton community shift in dominance from pico- and nanophytoplankton to pennate diatoms in Soiree and IronEx II? | ultimate control of phytoplankton was by iron supply and proximal control by micrograzers, which led to shift b/c micrograzers could keep up with increase in cyanobacterium, but mesozooplankton grazers couldn't with diatom growth
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| *What was the dominant forcing factor for maximum chlorophyll concentration in the Ocean Iron Enrichment experiments? | wind mixed layer depth
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| Does Ocean Iron Fertilization appear to be a good mitigation strategy for greenhouse gas emissions? | no b/c tried and mass mortality of large diatom bloom = rapidly sinking aggregates of cells and chains, could sequester carbon for many centuries; could be acceptable in damaged parts of ocean to avoid mass global catastrophe, more studies need to be done
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