Lake
2026
What Is Lake Ecosystem?
lake ecosystem is a natural system formed by all the living organisms (plants, animals, and microorganisms) and non-living elements (water, light, temperature, minerals) found in and around a lake. For example, Lake İznik is a typical example of a lake ecosystem.
Living Things
fish
frogs
tiry organisms
(plankton)
plants
small
animals
Common carp
Wels catfish
Zander
Northern pike
Silverside
Rudd
Chub
Common reed
Bulrush
Cattail
Pondweed
Water milfoil
Duckweed
Water lily
Hornwort
Marsh frog
European tree frog
Agile frog
Common frog
Pool frog
Water flea
Daphnia
Freshwater snail
Pond snail
Dragonfly larva
Mosquito larva
Water beetle
Tad
Non-living things
water
Air
temperature
sunlight
Minerals
WHAT HAPPENS IN A LAKE?
-Plants use sunlight to make food
-fish eat plants or other animals
-when animals die,bacteria break them down
-Everything goes in a cycle
a freshWater ecosystem is a place with water that is not salty
it include
-rivers
-lakes
-ponds
-streams
Why is it important?
-They give us drink water
-They are homes for many animals
-They help nature stay healty
What is a freshwater
ecosystem?
why is food chain important?
FOOD CHAIN
A food chain is the sequence that shows how energy and nutrients pass from one living thing to another.
It explains who eats whom in an ecosystem.
Example of a food chain in a lake like Lake İznik:
Algae (producer) → small fish → big fish → bird
-It shows how animals live
-It Keeps nature in balance
Effects of water pollution
on lake life
1. Lake of oxygen ;polliton can reduce in water.fish and other animals need oxygen to live.When there is less oxygen they can die
2. Too much Algae;Pollution can 'cause too much Algae to grow.This is called "Algae bloom"
- Alves blocks sunlight
-plants can't grow well
-oxygen decreases
3.Harm to Animals;Chemicals and trash can ,make animals sick,damage their bodies,kill small organisms
4.Damage to the food chair ;
-If small animals died bigger animals can't find food
-The food chain is broken
Pollution makes the water dirty, unsafe,unhealty
DECREASE İN WATER LEVEL
It means there is less water in lakes
-Evoporation
-Less rain
- -Too much water use by people
-Climate change
'Causes
Effect's on lake life;
1.Less space for animals: Fish and other animals have less space to live
2.Less oxygen : Shallow water has less oxygen,so animals can die
3.Water gets warmer:Warm water is dangerous for many fish
4.Plants dry out: Some water plants can't Survivor
Effect's on Environment;
1.Ecosystem becomes unbalanced
2.Food chain is affacted
3.Some species may disappear
Effect's on people;
1.Less drinking water
2.Problems for farming
3.Less fishing
HOW CAN WE PROTECT LAKE?
Save water
Do not build factores near the lake
We must protect forests (because erosion 'cause lakes to turn into swaml, and forest reduce the risk of erosion.)
Do not pollute with Chemicals
Keep the environment clean
Do not throw trash into water
Protect plants and animals
Warn other people
Lake ECOSYSTEM
A lake ecosystem is a freshwater environment where living organisms like plants, animals, and microorganisms interact with non-living elements such as water, sunlight, and nutrients. It is a balanced system where all components depend on each other to survive.
living- Non living
Things
plants
fish
frog
plants
small animals
Tiry organisms
water
sunlight
air(oxygen )
Temperature
minerals
Water pollution harms lake ecosystems by reducing oxygen levels and making it difficult for fish and other organisms to survive. Toxic chemicals and waste can poison living things and disrupt the balance of the ecosystem. Over time, pollution can lead to the loss of biodiversity and even cause parts of the lake to become lifeless.
Fresh Water
A freshwater ecosystem is a natural environment found in rivers, lakes, ponds, and streams where organisms live in non-salty water. It includes plants, animals, and microorganisms that interact with each other and their surroundings. These ecosystems are important for biodiversity and provide water for drinking, agriculture, and daily life.
Food Chain
A food chain in a lake ecosystem shows how energy and nutrients move between living things. It usually starts with plants or algae, which are eaten by small animals like zooplankton, then by small fish, and finally by larger fish or birds. Each level depends on the one before it for energy.
Decrease in the water level
A decrease in the water level of a lake negatively affects the entire ecosystem. It reduces habitats for aquatic animals, decreases biodiversity, and can increase pollution concentration in the remaining water. Over time, the lake may become shallower and turn into a swamp or dry land, which harms both nature and human activities.
Water Pollution
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