These are big fresh water ecosystem.
zones
- Top layer – shallow, warm, prone to anthropogenic activities – Littoral zone
- Second layer – enough sunlight, high primary productivity – Limnetic zone
- Third layer – very poor or no sunlight – Profundal zone
Eg. Dal lake in Srinagar, Naini lake in Nainital
structure
Abiotic factors
Abiotic factors in a lake environment include: sunlight, temperature, water flow, rocks and oxygen content.
Biotic factors:-
1. Planktons – phytoplankton eg. Algae – zooplankton eg. Rotifers
2. Nektons – that swims in water eg. Fishes
3. Neustons – that float on the surface of water Benthos – that attached to sediments eg. Snails
Types of lakes :
1. Oligotrophic lakes – with less nutrient content
2. Eutrophic lakes – with very high nutrient content due to fertilizer contamination
3. Desert salt lakes – that contains high saline water due to over evaporation
4. Volcanic lakes – formed by water emitted from magma due to volcanic eruptions
5. Dystrophic lakes – that contains highly acidic water (low pH)
6. Endemic lakes – lakes that contain many endemic species, etc.
