VCU BIOL 317 - Aquatics (4 pages)

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Lecture number:
Lecture Note
Virginia Commonwealth University
Biol 317 - Ecology

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BIOL 317 1st Edition Lecture 8 Outline of Last Lecture Climate Outline of Current Lecture Aquatics Current Lecture Aquatics Hydrologic cycle Sunlight drives the cycle Ocean glaciers groundwater organisms are reservoirs for water Oceans and seas Pacific Atlantic Indian big ocean basins 71 of earth covered in ocean 4 miles deep at max Average depth is 4000 meters Low surface area to volume ratio they resist change in temperature Reduced sunlight Low productivity Neritic Zone Area after the intertidal zone Epipelagic Zone From sea surface to a depth of 200 meters Zooplankton eat Phytoplankton which reside in these zones Mesopelagic zone 200 meters to 1000 meters deep Bathypelagic zone These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 1000 meters to 4000 meters Abyssal zone 4000 meters to 6000 meters Benthic organisms that live below Hadal zone 6000 meters and below Marine snow Organic material falling from the upper layers of the ocean Hydrothermal vent Pumps up hot sea water that are rich in sulfur and iron compounds allowing organisms to perform chemosynthesis at such depth 80 of sunlight gets absorbed within the first 10 meters Below 60 meters is the aphotic zone where respiration exceeds photosynthesis Above 60 meters to surface is the photic zone where photosynthesis exceeds respiration Warm water floats over cold because cold water is more dense False Bottom Assuming one has reached the bottom of the ocean at 1000 meters which is just the migratory fish coming up from the depths to feed on zooplankton 6 times the amount of plastic than marine organisms in the ocean nurdles is what plastic is made off 88 billion per year plastic Gradients Thermocline o Change in temperature Pycnocline o Change in pressure Salinity o Change in salinity o High evaporation areas have water that is more saline Oceanic circulation Clockwise gyres flow of the ocean currents Northern

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