What is an ecosystem? -- Energy in ecosystems -- The Amazon River -- The Nile River -- The Yangtze River -- The Colorado River -- The St. Lawrence River -- The Great Lakes -- Great Salt Lake -- Lake Mead -- Crater Lake -- Lake Baikal -- All part of a system.
Summary:
Rivers and lakes are rich habitats filled with all the elements their inhabitants need for survival. Peel back a corner of these amazing ecosystems to discover the incredible organisms that function within them and around them, from microorganisms and plants to fish and the mammals that feed on them.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.