22_nutrients - Nutrients GS222 Lecture22 Overviewthislecture

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Nutrients GS222 Lecture 22
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Overview - this lecture Photosynthesis and respiration Removal of nutrients from photic zone Supply of nutrients to photic zone
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Photosynthesis Photosynthesis:   dominant form of primary  production in the ocean and on land Requires water, CO 2 , nutrients, energy On left-hand side nutrients are in dissolved  form On right-hand side, nutrients are embedded  within the organic matter Nutrient availability often limits primary  production
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Chlorophyll and nutrients Chlorophyll a:   pigment found in chloroplasts (a  type of cell structure) that captures light energy complex molecule that contains carbon,  hydrogen, oxygen, and  nitrogen low nitrogen levels often limit primary production an ecosystem constrained by lack of a key  nutrient (e.g. N, P, Fe) is  nutrient limited
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Satellite-based estimates of chlorophyll concentration using highly sensitive ocean color sensors Global chlorophyll concentrations
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Respiration Used by autotrophs and heterotrophs Breakdown of organic matter releases nutrients into  seawater Bacterial respiration is primarily responsible for  nutrient cycling  Oxidation of organic matter to carbon dioxide and  water releases energy stored in organic matter
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Phosphorus cycling CO 2  + H 2  CH 2 O + O 2 Phosphorus:   a key nutrient for certain organic molecules
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22_nutrients - Nutrients GS222 Lecture22 Overviewthislecture

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