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Ecosystems are integrated systems of organisms interacting with their physical environments, constituting the Earth's biosphere and supporting human existence. Resilient functioning ecosystems support food webs, build soil, enhance crop pollination, purify water, cycle nutrients, detoxify waste, and regulate the atmosphere. The U.S. Geological Survey (USGS) conducts research and monitoring to develop and convey a fundamental understanding of ecosystem function and distributions, physical and biological components and trophic dynamics for freshwater, terrestrial, and marine ecosystems and the human and fish and wildlife communities they support.

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Page Last Modified: Thursday, February 17, 2011