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

6. Zones of a Reservoir

7. Zonation of Littoral Vegetation

8. Aufwuchs

9. Categories of Aufwuchs Epiphytic Epipelic Episammic Epilithic

10. Phytoplankton

11. Zooplankton

12. Benthos

13. Nekton

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

15. Food Web

16. River Continuum

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

18. 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.

19. Diversity Complexity of a community

20. Relative Sizes

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

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

23. Energy Flow in an Ecosystem