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Aquatic ecology 101


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A Powerpoint on teaching Aquatic Ecology

I found this by doing a "Google Search" on
"Aquatic Ecology" and ".ppt"

I posted this here for the benefit of a young teacher friend, but also wanted to make the point, especially to users of eInstruction's classroom Performance System, that by doing such a search, they can easily find Powerpoints they can use with their CPS system.

Also , Powerpoint will let you "save as " .jpg
so you can also use individual slides as graphics to illustrate individual CPS questions.

Bill McIntosh


Authorized eInstruction Consultant

My profile :

"Some men see things as they are and ask 'Why?'
I dream things that never were and ask, 'Why not?'"
Robert F. Kennedy, 1968

I am using site called Slideshare to post and share information about eInstruction’s products. Here are the links:

This site allows one to view the files before downloading.

Because I work with some federally sponsored education outreach programs, there are some “K-12 centric” files located here, but also a lot of not only product brochures and information for corporate and government users and Higher Ed users , but also how-to and help files that my clients tell me are very useful

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Aquatic ecology 101

  1. 1. Aquatic Ecology 101
  2. 2. Outline <ul><li>Types of aquatic ecosystems </li></ul><ul><li>Hydrology of lakes and ponds </li></ul><ul><li>Lake zones and processes </li></ul><ul><li>Aquatic food web </li></ul><ul><li>Lake trophic states </li></ul><ul><li>Concept of limiting nutrient </li></ul>
  3. 3. Types of Aquatic Systems Lakes & Ponds Rivers & Streams Wetlands Estuaries Marine system Groundwater
  4. 4. Lakes and Ponds <ul><li>Critical differences from other freshwater systems </li></ul><ul><ul><li>Longer residence time </li></ul></ul><ul><ul><li>Typically not shaded with most of the surface area exposed to sunlight </li></ul></ul><ul><ul><li>Florida lakes are typically shallow and well mixed </li></ul></ul><ul><ul><li>Florida lakes are often highly colored, but can have light reaching much of the bottom </li></ul></ul>Photo by Bill Wade
  5. 5. Watershed / Lake Area Ratio <ul><li>Watershed area relative to lake area will influence the residence time of water in the lake. </li></ul><ul><li>This ratio is also a factor in the nutrient loading to the lake </li></ul>
  6. 6. Lake Habitat Zones
  7. 7. Lake Littoral Zone <ul><li>Functions </li></ul><ul><ul><li>Intercepts Nutrients </li></ul></ul><ul><ul><li>Refuge from Predators </li></ul></ul><ul><ul><li>Nursery for Fish </li></ul></ul>Oligotrophic Northern Lake Eutrophic Southern Lake
  8. 8. Lake Limnetic/Pelagic Zone <ul><li>Functions </li></ul><ul><ul><li>Plankton </li></ul></ul><ul><ul><li>Zooplankton </li></ul></ul>
  9. 9. <ul><li>Submerged Aquatic Vegetation (SAV) </li></ul><ul><ul><li>Nutrient uptake </li></ul></ul><ul><ul><li>Sediment stabilization </li></ul></ul><ul><ul><li>Habitat </li></ul></ul><ul><ul><li>Oxygen production </li></ul></ul>Lake Limnetic / Pelagic Zone
  10. 10. Pond Food Web Nutrients Algae/Plants Grazers Fish Nutrients Algae/Plants Grazers Fish
  11. 11. Relationship Between Nutrients and Pond Productivity Nutrients Algae/Plants Grazers Fish Nutrients Nutrients Nutrients Nutrients Habitat/Environmental Impacts Algae/Plants Grazers Fish Algae/Plants Grazers Fish Algae/Plants Grazers Fish Algae/Plants Grazers Fish
  12. 12. Low nutrients Low primary productivity Low grazers and insects Low fish production Clear water Sandy/low organic matter on bottom
  13. 13. TROPHIC STATE Moderate nutrients Increased primary productivity More grazers and insects More fish production Moderate water clarity More aquatic plants Some organic sediment accumulation
  14. 14. TROPHIC STATE High nutrients High primary productivity Large number of grazers and insects Moderate fish production Low water clarity, or Clear with aquatic plants High organic sediment accumulation
  15. 15. Trophic State Change <ul><li>Nutrients & Productivity </li></ul><ul><li>Sediment & Accumulation </li></ul><ul><li>Species Shifts </li></ul><ul><li>Species Richness </li></ul>
  16. 16. Manipulating Pond Response to Nutrients Fish Grazers Nutrients Algae/Plants Grazers Fish X Algae/Plants X Source of the problem
  17. 17. Limiting Nutrient Concept <ul><li>… Plants need nutrients to grow </li></ul><ul><li>Nitrogen and Phosphorus are the main nutrients </li></ul><ul><li>For every unit of N you need so many units of P </li></ul><ul><li>If one nutrient is not in sufficient supply it will limit the total production potential. </li></ul><ul><li>For algae </li></ul><ul><ul><li>N:P > 17 Phosphorus Limited </li></ul></ul><ul><ul><li>N:P < 10 Nitrogen Limited </li></ul></ul><ul><ul><li>10 < N:P < 17 Co-Limitation </li></ul></ul><ul><ul><li>N:P < 22 will tend to promote Cyanobacteria which are nitrogen fixers </li></ul></ul>
  18. 18. Phosphorus Limitation: Lake 227
  19. 19. Total Phosphorus / Chlorophyll-a Relationship <ul><li>Phosphorus is typically liming nutrient in freshwater </li></ul><ul><li>Nitrogen is typically limiting nutrient in marine system. </li></ul>
  20. 20. Summary <ul><li>Lakes have longer residence time and more light than other freshwater systems </li></ul><ul><li>Littoral Zone, Pelagic Zone, Submerged Aquatic Vegetation </li></ul><ul><li>Nutrients regulate algae > grazers > fish </li></ul><ul><li>Removing algae doesn’t remove nutrient regulator </li></ul><ul><li>Phosphorus is typical nutrient limiting nutrients depending on N:P ratio </li></ul>Stormwater ponds respond just like lakes do to nutrients
  21. 21. Questions?