1. Lakes and Ponds

2. A Lake Ecosystem

4. Animals must adapt to life on the lake.
Water beetles and diving spiders use air bubbles when diving for food.
Amphibians can burrow in mud to keep from freezing or overheating

5. How Nutrients Affect Lakes

6. 1.Oligotrophic lakes are very low in nutrients.
Ecologists will classify lakes based on their nutrient levels and biological productivity.
1.Oligotrophic lakes are very low in nutrients.
Populations of plankton and algae are very low.
Clear water
McDonald Lake Glacier National Park Montana, United States 6

7. 2. Eutrophic lakes have greater concentrations of nutrients.
This removes a growth limiting factor for algae and plankton.
South Carolina, United States 7