Ecosystem

• A functioning community of nature that includes fauna and flora together with the chemical and physical environment with which they interact. Ecosystems vary greatly in size and characteristics; an ecosystem can be a mud puddle, a field or orchard, or a forest. An ecosystem provides a unit of biological study and can be a unit of management.
• a group of organisms with specific relationships between themselves and a particular environment. Source: Anthromorphemics
• The organisms in a plant population and the biotic and abiotic factors which impact on them.
• All forms of life that live in relation to one another and a shared physical environment.
• The interacting system of a biological community and its non-living environmental surroundings.
  Source: Terms of the Environment