The complex system of plant, animal, fungal, and microorganism
communities and their associated non-living
environment interacting as an ecological unit.
Ecosystems have no fixed boundaries; instead their parameters are set to the
scientific, management, or policy question being examined. Depending upon the
purpose of analysis, a single lake, a
watershed, or an entire region could be
considered an ecosystem.
Glossary of Climate Change Terms
Biosphere - Ecosystem change - Ecosystem management - Ecosystem processes - Ecosystem scale - Ecosystem services
To read about this term in context:
GreenFacts Summary on Ecosystem Change: