10. Productivity-web

10 Productivity-web - Biota in the Ocean Focus on Primary Producers(organisms that provide energy other organisms use Direct consumers of nutrients

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Biota in the Ocean Focus on Primary Producers (organisms that provide energy other organisms use) Direct consumers of nutrients Base of energy pyramid (1 st trophic level) Greatest relevance to climate Greatest biomass (total mass of organic matter in living organisms) in the ocean Small but abundant
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Trophic Pyramid
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Primary Producers Primary Producers- In the ocean = single cell phytoplankton (floating plants) Coccolithophores Diatoms Dinoflagellates (see color plates 8-8)
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Coccolithophores 2 microns
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Diatoms 10 μ m
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Dinoflagellates 500 microns Red Tide
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Primary Producers Requirements Light (energy) Found in the photic zone (~100 m water depth) Maximum production is below the surface- too much radiation at the surface Nutrients Nitrate, phosphate, carbon Water Abundant in the ocean
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Photosynthesis Simple reaction: CO 2 + H 2 O CH 2 O + O 2 More accurate reaction 106 CO 2 + 16 HNO 3 + H 3 PO 4 + 122 H 2 O  (CH 2 O) 106 (NH 3 ) 16 (H 3 PO 4 ) + 138 O 2 Organic matter light
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Marine Productivity Primary producers in the ocean: - Mostly microscopic phytoplankton (live in the surface ocean: light and nutrients 106 CO 2 + 16 HNO 3 + H 3 PO 4 + 122 H 2 O  (CH 2 O) 106 (NH 3 ) 16 (H 3 PO 4 ) + 138 O 2
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Organic Matter • (CH 2 O) 106 (NH 3 ) 16 (H 3 PO 4 ) Redfield ratio C:N:P 106:16:1 Seawater has the same ratio because the nutrients mostly come from the decay of organic matter
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Sources of Nutrients Carbon 1) Recycling within the ocean (decay of organic matter) 2) Dissolved CO 2 from atmosphere (air-sea exchange) 3) River runoff- Weathering of organic matter on land CO (g) CO (aq)
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Sources of Nutrients Nitrogen 1) Recycling within ocean (decay of organic matter) 2) Dissolved N 2 from the atmosphere 3) River run off- weathering of terrestrial organics Biota can’t use N 2 or NH 3 (ammonia- biological waste product) Nitrogen fixation converts other forms to NO
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This note was uploaded on 07/08/2011 for the course GLY 3074 taught by Professor Ellenmartin during the Spring '09 term at University of Florida.

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10 Productivity-web - Biota in the Ocean Focus on Primary Producers(organisms that provide energy other organisms use Direct consumers of nutrients

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