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MSU ISB 201 - Dead Zone

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ISB 201 1st Edition Lecture 15 Outline of Last Lecture I. WatershedII. Water diversionIII. Classification of freshwater Outline of Current Lecture IV. Dead ZoneV. What does this affect?Current LectureIV. Dead ZoneA. Defined hypoxic (low oxygen) areas in oceans and large lakes caused by excess of nutrients from human activities that deplete the oxygen required to support marine life in bottom and near-bottom water1. Area where a large river enters ocean is vulnerable 2. Rapidly increases as oceans warmB. Phytoplankton algae growth due to excessive nutrients in water1. Gulf of Mexico algae growth from nutrient runoff from Mississippi River basin that empties into gulf2. Growing population, increased agriculture, increased fertilizer, increased dead zonesa. Food production increase and biofuel production for ethanol contribute C. Phytoplankton vs. Benthic Plants1. Both are green plants that use photosynthesis to produce their own food andgive off oxygena. Photosynthesis= light + CO2 + H2O  O2i. Plants important to produce all the oxygen that is in the water that aquatic organisms require to surviveii. Dissolved oxygen= oxygen in water body2. Phytoplankton (algae)= free floatinga. Block sunlight from benthic plants and they die because cannot perform photosynthesis for food and oxygen production decreasesb. Organisms in water die from lack of oxygen 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.3. Benthic plants= rooted to the bottomD. Bacteria (aerobic= need oxygen)1. Decomposers that seek out the dead2. Consume remainder of the oxygen as they quickly reproduce to feed on the dead material3. RESULT= hypoxic dead zone in Gulf of MexicoVI. What does this affect?A. FishermanB. TourismC. Sport fishingD. Consumers of shrimp because prices will increaseE. Sea food industry employeesF. Gas prices will increase as fuel is needed to fix the dead zone; possible full cost pricing on ethanol G. College students because they will have to face these problems in the


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