FRESHWATER ECOSYSTEM

The freshwater ecosystem is an acuatic ecosystem. It includes lakes, ponds, rivers and streams.

They are called freshwater because their water is not salty.

FOOD CHAIN

A food chain is when animals eat each others in an order (a chain). There are: producers, consumers and decomposers.

Here the producer is the algae. 

The consumers, in this case, are the mollusks (primary), the slimy sculpins (secundary), the salmons (tertiary).

Finally the decomposers are the fungi (not in the picture).

INTERACTION WITH HUMANS 

NEGATIVE EFFECTS 

1. Toxic spill from factories (they are like poison for the fish and plants).
2. We can damage it by throwing paper, plastic... 
3. Too much fishing kills whole species.

POSITIVE EFFECTS

1. We can use technology to filter rivers and lakes, so the get cleaner.
2. We can protect some species from extinction by using fish farming ("piscicultura").
3. We can clean rivers to remove bottles, plastic bags and other things thrown by humans.

FUN FACT

Some inventors have created a kind of vacuum cleaner to remove plastic and garbage from the sea. We could use them also in big rivers. They are called "seabins". You can learn more about them in this video:

I HOPE YOU LIKE IT 

THANKS FOR WATCHING!!!