The ecosystem refers to a community inserted in a given environment, in which the living beings that make it up actively live together. However, the aquatic ecosystem is one where there is water, so its living components, vegetation and animals coexist and develop in the same water.
Our planet has two types of water: a salty one (the oceans and seas) and a fresh one (formed by lakes, rivers, streams, among others), therefore, the animals and plants that live in any of these environments have natural characteristics that allow them to survive in the conditions that prevail in the aforementioned aquatic ecosystems.
It is not the same for an animal that lives in salt water to adapt to totally different living conditions in a fresh water environment.
In these cases there is no adaptation to change, so species tend to disappear.
Any ecosystem needs two types of elements to survive: biotic (alive) and abiotic (lifeless), whose inter- relationship efficiently contributes to the balance and the maintenance of the ecosystem in question. Aquatic Ecosystem
Among the first stand out plants, animals, fungi and bacteria, while in the abiotic factors we can group air, sun, water, climate, temperature .
When we talk about interaction and the need for all the elements mentioned in the previous paragraph to be present, it has to do with the fact that they need each other to survive and develop in the aquatic ecosystem
Plants or zooplankton serve as a staple food for both small and larger fish (such as whales), while zooplankton need the energy of sunlight to survive. The smaller fish, in turn, are the food of the larger ones, as well as the rest of the aquatic plants also serve as food for the fungi and bacteria found in this habitat.
It is worth noting that the aquatic ecosystem is of great importance when developing various activities such as agriculture , water supply for personal consumption and the production of certain products.
However, we must mention that unscrupulous and deficient human action is one that contaminates the waters and is often a concrete and direct threat to the continuity of life and species.