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Structure of Aquatic Ecosystems

Structure of Aquatic Ecosystems. Relative importance of allochthonous versus autochthonous sources of nutrients sediments o rganic matter (dissolved and particulate). Productivity within a Watershed. Wetland very productive Terrestrial systems moderately productive

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Structure of Aquatic Ecosystems

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  1. Structure of Aquatic Ecosystems

  2. Relative importance of allochthonous versus autochthonous sources of • nutrients • sediments • organic matter (dissolved and particulate)

  3. Productivity within a Watershed • Wetland very productive • Terrestrial systems moderately productive • Aquatic systems least productive

  4. Zones of a Lake

  5. Zones of a Reservoir

  6. Zonation of Littoral Vegetation

  7. Aufwuchs

  8. Categories of Aufwuchs • Epiphytic • Epipelic • Episammic • Epilithic

  9. Phytoplankton

  10. Zooplankton

  11. Benthos

  12. Nekton

  13. Trophic Structure Primary Producers Primary Consumers Secondary Consumers (carnivores) Decomposers

  14. Food Web

  15. River Continuum

  16. Productivity Rate at which energy enters one trophic level from a lower trophic level.

  17. Efficiency Energy transfers not very efficient because of dissipation through metabolism, etc. Also, mechanisms of energy transfer not inherently efficient. For example photosynthesis is less than 1% efficient in water.

  18. Diversity Complexity of a community

  19. Relative Sizes

  20. Biomass Ways to determine: • Volume and number • Weight –fresh and dry • Oxidize living matter to CO2 • Total ATP • For primary producers, extract chlorophylls

  21. Production • New organic mass per unit of time • Σ [new organic biomass - respiration -excretion - secretion – injury – death – grazing]

  22. Energy Flow in an Ecosystem

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