Lab6. Community ecology2

Lab6. Community ecology2 - 3/5/12 + Biol 1209 Lab 5....

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3/5/12 1 + Biol 1209 Lab 5. Aquatic ecosystems II + Today ` s lab n Quiz n Intro to BOD NPP, GPP and R n Intro to nutrient cycles n Test water for nutrients & enter data n Pop. ecology data collection( Chlamydomonas ) n NCR: Lake ecology question/hypothesis/prediction n Talk about writing assignment 2
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3/5/12 2 + Objectives of lake ecology lab n Asses water quality for 4 freshwater ecosystems in the LSU vicinity. n Determine how abiotic variables within these systems affect freshwater communities Week 1: Clarity Depth Temperature pH Phytoplankton abundance Dissolved Oxygen mg/L/hr (night labs) Week 2: Nutrients Phosphate Nitrate Nitrite Ammonium Dissolved Oxygen Gross primary production Respiration Net primary production Week 3: Link lake ecology results to population ecology experiment How do abiotic variables impact the biotic components of the system ? + Energy (O 2 ) produced and consumed in ecosystems n Photosynthesis (P)- produce O 2 n Autotrophs capture O 2 by photosynthesis n Phytoplankton n Cellular Respiration (R)- use O 2 n Heterotrophs and autotrophs use these sugars to convert chemical energy into a more usable form for the cells of the organism (ATP) n Zooplankton: heterotrophs that USE the oxygen produced n Decomposition (D)- use O 2 n Death and chemical breakdown of organisms by bacteria n USE Oxygen – bacteria/heterotrophs
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3/5/12 3 + Gross Primary Production (GPP) n Rate at which an ecosystem's primary producers (autotrophs) capture and store a given amount of chemical energy as biomass in a given length of time Net Primary Productivity (NPP) n Rate at which all the plants in an ecosystem produce net useful chemical energy n The energy produced by autotrophs (GPP) in excess over that used by autotrophs and heterotrophs through respiration and (R) and decomposition (D) + Biological Oxygen Demand n The lake water in the bottles contains microscopic autotrophic and heterotrophic organisms n By incubating the bottles in the lake, we can keep our samples under the same the conditions as in the lake n Night labs last week n Chemical procedure for determining the amount of dissolved oxygen needed by aerobic biological organisms in a body of water n Used to indirectly measure members of aquatic organisms (phytoplankton and zooplankton)
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This note was uploaded on 03/20/2012 for the course BIOL BIOL 1209 taught by Professor Gregg during the Spring '09 term at LSU.

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Lab6. Community ecology2 - 3/5/12 + Biol 1209 Lab 5....

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