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Dissolved Oxygen and Aquatic Primary Productivity

Dissolved Oxygen and Aquatic Primary Productivity. Dissolved Oxygen. In an aquatic environment, oxygen must be dissolved in order to be available for organisms You measured the amount of dissolved oxygen in water samples at different temperatures. Results. Dissolved Oxygen Availability.

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Dissolved Oxygen and Aquatic Primary Productivity

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  1. Dissolved Oxygen and Aquatic Primary Productivity

  2. Dissolved Oxygen • In an aquatic environment, oxygen must be dissolved in order to be available for organisms • You measured the amount of dissolved oxygen in water samples at different temperatures

  3. Results

  4. Dissolved Oxygen Availability • Oxygen is essential for cellular respiration in most organisms • Factors that affect the amount of dissolved oxygen in water are: • Temperature • Photosynthetic activity • Decomposition activity • Mixing and turbulence • Salinity

  5. DO and Temperature • Nomograph—how much oxygen water can hold (saturation)

  6. Aquatic Primary Productivity • Primary Productivity—rate at which photosynthetic organisms produce organic compounds • Gross productivity = entire photosynthetic production of organic compounds • Net productivity = organic materials remaining for next trophic level (after photosynthetic organisms have used glucose for respiration)

  7. The Lab • You analyzed the effect of varying amounts of light (various water depths) on primary productivity • Dissolved oxygen is an easily measured product of photosynthesis and cellular respiration

  8. Productivity and Lake Depth • You monitored the effect of varying light levels on DO in an algae rich water culture

  9. Initial

  10. Dark

  11. Light

  12. Measuring DO • You measured DO in the original sample • Then you measured DO after 24 hours of photosynthesis and respiration under various light

  13. Analysis of Results

  14. Results

  15. Sample Problem • All screens and labels were removed accidentally. Unidentified bottles, obtained the results shown below. • The initial oxygen reading for this water was 4 mg O2/l.

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