Aquatic Systems - Ecosystem Lake
A lake is also referred to as a pond and is the counterpart of a river (streams and rivers). However, it can happen that a lake is in constant water exchange due to inflows and / or outfalls.
But what is a ecosystem and what does it actually consist of?
For that, let us first look at the term itself. "Цko" comes from the ancient Greek "oikos" and means as much as home. "System" can be derived from the ancient Greek "systema" and means "something connected". And indeed, in a ecosystem, two things are linked together: the biotope (Habitat) with the Biozцnose (Creature). Transferred to the ecosystem lake, therefore, the interactions and connections of the sea life with the living beings living there are in the foreground.
The number of organisms in such a ecosystem is only roughly conservable and ranges in the range of several billion individual micro-organisms. Of course, larger animals such as crabs or fish live in such a ecosystem. All living creatures can be divided into producers, consumers and destructors:
The producers in a lake are essentially plants and algae (also known as phytoplankton). In the course of photosynthesis, they produce glucose (sugar) from water, carbon dioxide and light for their growth, as well as oxygen as a waste product. The oxygen is used by other aeoroben (oxygen-consuming) creatures in the lake.
Under consumers It is possible to grasp all organisms that can not produce their own food (autotrophically), but are dependent on food intake (heterotrophic). Either they feed on plants and phytoplankton (herbivores), or on other creatures (carnivores). The pike (pictured right) is a typical predatory fish and therefore a consumer.
Finally there are the decomposers, which mainly include bacteria and fungi. Their main task is to break down dead biomass (consisting of the dead producers and consumers) so that the organic matter is returned to inorganic matter. This closes the material cycle between producers, consumers and destructors