1. USGS Thesaurus
Categories > topics > population and community ecology
ecosystems
The interacting populations of plants, animals, and microorganisms occupying a certain area, and their relationship to the environment.
This category is also used for biosphere, clines, ecoclines, and ecotones
Subtopics
aquatic ecosystems
terrestrial ecosystems
wetland ecosystems
See also
ecology
ecosystem functions
ecosystem services valuation
habitats
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