017-Productivity - The open ocean is a biological desert....

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“The open ocean is a biological desert.”
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Primary Production Global chlorophyll concentrations for Oct. 2000
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Feb 5, 1998: uniformly low pigment concentrations during all seasons
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Primary productivity Primary productivity is the amount of carbon (organic matter) produced by organisms Mostly through photosynthesis Energy source = solar radiation Also includes chemosynthesis Energy source = chemical reactions
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Photosynthetic productivity
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Primary Producers Common Name Blue-green algae (cyanobacteria) Red algae Brown algae Green algae Coccolithophorids Dinoflagellates Diatoms Seagrass
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Oceanic photosynthetic productivity Controlling factors affecting photosynthetic productivity: Availability of nutrients Nitrates Phosphates Iron Amount of sunlight Varies daily and seasonally Sunlight strong enough to support photosynthesis occurs only to a depth of 100 meters ( euphotic zone )
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Locations of maximum photosynthetic productivity Coastlines Abundant supply of nutrients from land Water shallow enough for light to penetrate all the way to the sea floor Upwelling areas Cool, nutrient-rich deep water is brought to the sunlit surface
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Upwelling
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017-Productivity - The open ocean is a biological desert....

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