Check out this Websites to look for more information about your own individual ecosystem!
http://www.kidsgeo.com/geography-for-kids/0166-tundra.php
http://www.nhptv.org/natureworks/nwepecosystems.htm
http://library.thinkquest.org/11353/savannah.htm
http://www.epa.gov/bioiweb1/aquatic/marine.html