Warm up

1. Warm up What is interspecies competition? What is intraspecies competition? Give example of each

2. What is watershed ? • A region draining into a river, river system, or other body of water.

3. What is an estuary • Where the river meets the sea.

5. How many zones do lakes and pondsHave? • Ponds and lakes have three zones. • Littoral zone • Limnetic zone • Profundal zone

6. Littoral Zone • The shallow zone of the lake and river near the shore line is known as Littoral zone. • Various aquatic plants along with various predatory insects, amphibians, and small fish are found in this zone.

7. Limnetic zone • The area of the pond that further away from the shore but close to the surface is known as Limnetic zone. • This zone is also known as Euphotic zone because light can penetrate in this area of the lake.

8. Continued Limnetic zone • Some floating algae, zooplankton and fish live in this zone.

9. Profundal zone • Deep water zone that is below the limits of effective light penetration is known as Profundal zone. • Numerous bacteria and worm like organisms that eat debris on the lake’s bottom live in this zone. • This zone is also known as Aphotic Zone. That means no light zone

10. plankton • Tiny free floating weakly swimming organisms are known as plankton.

11. Phytoplankton • Single celled algae are known as phyto plankton. • Phta means plant.

12. Zooplankton • Planktonic animals that feed on phytoplankto –n are known as Zooplankton.

13. Euphotic Zone • The layer from the surface of the water to the depth where the light penetration is too low. Another name for limnetic is euphotic zone.