Ecosystems

Ecosystem is a natural unit consisting of all plants, animals and micro-organisms in an area functioning together with all of the non-living physical of the environment.

The ecosystem concept is the idea that living organisms are continually engaged in a set of highly interrelated relationships with every other element constituting the environment in which they exist. In a given area interacting with the physical environment so that a flow of energy leads to clearly defined trophic structure, biotic diversity, and material cycles within the system is an ecosystem."The human ecosystem concept is then grounded in the deconstruction of the human/nature dichotomy, and the emergent premise that all species are ecologically integrated with each other, as well as with the abiotic constituents of their biotope.
Ecosystems can be bounded and discussed with tremendous variety of scope, and describe any situation where there is relationship between organisms and their environment. If humans are part of the organisms, one can speak of a 'human ecosystem'. As virtually no surface of the earth today is free of human contact, all ecosystems can be more accurately considered as human ecosystems, or more neutrally as human-influenced ecoystems.

Examples :

1. Aquatic ecosystem
2. Chaparral
3. Coral reef
4. Desert
5. Greater Yellowstone Ecosystem
6. Human ecosystem
7. Large marine ecosystem
8. Littoral zone
9. Marine ecosystem
10. Rainforest
11. Savanna
12. Subsurface Lithoautotrophic Microbial Ecosystem
13. Taiga
14. Tundra
15. Urban ecosystem