Lecture6PrimProd

Lecture6PrimProd - Photosynthesis, Primary Production and...

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Photosynthesis, Primary Photosynthesis, Primary Production and Growth Production and Growth Provided by the SeaWiFS Project, NASA/Goddard Space Flight Center and ORBIMAGE
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The ocean accounts for half the The ocean accounts for half the photosynthesis on earth photosynthesis on earth marine.rutgers.edu/opp/
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Phytoplankton are responsible for 90-96% of marine primary production Seaweeds contribute ~ 2-5% Chemosynthetic organisms ~2-5%
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Photosynthesis vs. Primary Production vs. Growth Photosynthesis = The process by which carbohydrates are synthesized from carbon dioxide and water using light as an energy source. Most forms of photosynthesis release oxygen as a byproduct. “Gross photosynthesis” = total carbon fixed “Net photosynthesis” = Gross - carbon respired Primary production = the synthesis of organic materials from inorganic substances by photosynthesis or chemosynthesis If primary production exceeds respiration (losses), then “growth” may occur (an increase in size leading to cell division) ~ net primary production (more on this later)
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Photosynthesis CO 2 + 2H 2 O ~8 h ν →  (CH 2 O) +H 2 O +O 2 This process can be quantified by measuring the increase of oxygen , the decrease of CO 2 , or the increase of organic carbon
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Lecture6PrimProd - Photosynthesis, Primary Production and...

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