open oceans: pelagic ecosystems iii. comparing the makeup of water and plankton mean elemental...
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![Page 1: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N](https://reader036.vdocuments.us/reader036/viewer/2022062722/56649f2a5503460f94c44dd4/html5/thumbnails/1.jpg)
Open Oceans: Pelagic Ecosystems III
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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
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Limited water mixing further limits nutrient availability
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Testing models: measuring plankton in open oceans
• Techniques for studying plankton consumers
• Plankton levels may be dropping (NASA study)
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From productivity to food webs: A size-based pelagic food web
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Grazing pressure
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Limits & Flows of NPP
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Marine “Snow”
krill
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A spatially realistic pelagic food web
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What are links among trophic levels in pelagic systems?
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Large phytoplankton vary with depth
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Nutrient distribution with depth
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Distribution of food web biomass
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The global nitrogen cycle
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Influences on biologically useful Nitrogen
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Diatom mats can migrate vertically
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Consequences of active transport of NO3
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Links to oceanic nekton