Lab6. Community ecology2

Lab6. Community ecology2 - Biol 1209 Lab 5 Aquatic...

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3/5/12 1 + Biol 1209 Lab 5. Aquatic ecosystems II + Today s lab Quiz Intro to BOD NPP, GPP and R Intro to nutrient cycles Test water for nutrients & enter data Pop. ecology data collection ( Chlamydomonas ) NCR: Lake ecology question/hypothesis/prediction Talk about writing assignment 2
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3/5/12 2 + Objectives of lake ecology lab Asses water quality for 4 freshwater ecosystems in the LSU vicinity. 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 Photosynthesis (P)- produce O 2 Autotrophs capture O 2 by photosynthesis Phytoplankton Cellular Respiration (R)- use O 2 Heterotrophs and autotrophs use these sugars to convert chemical energy into a more usable form for the cells of the organism (ATP) Zooplankton: heterotrophs that USE the oxygen produced Decomposition (D)- use O 2 Death and chemical breakdown of organisms by bacteria USE Oxygen – bacteria/heterotrophs
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3/5/12 3 + Gross Primary Production (GPP) 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) Rate at which all the plants in an ecosystem produce net useful chemical energy 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 The lake water in the bottles contains microscopic autotrophic and heterotrophic organisms By incubating the bottles in the lake, we can keep our samples under the same the conditions as in the lake Night labs last week Chemical procedure for determining the amount of dissolved oxygen needed by aerobic biological organisms in a body of water Used to indirectly measure members of aquatic organisms (phytoplankton and zooplankton)
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