Biodiversity (or how much biological difference you can pack into a spot) is important no to all ecosystems. Learn more about biodiversity.
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- Campbell, Neil A. and Jane B. Reece. "Biology." Seventh edition. Benjamin Cummings. 2005.
- Illman, Deborah L. "Keystone Species Hypothesis." Pathbreakers: A Century of Excellence in Science and Technology at the University of Washington. University of Washington. November 1996. (Sept. 12, 2010)http://www.washington.edu/research/pathbreakers/1969g.html
- Kasnoff, Carig. "Spotlight on Keystone Species." Bagheera. (Sept. 12, 2010)http://www.bagheera.com/inthewild/spot_spkey.htm
- Keeton, William T. "Biological Science." Third Edition. W.W. Norton & Company, Inc. 1980.
- McClintock, Jack. "20 Species We Might Lose." Discover Magazine. October 2000. (Sept. 12, 2010)http://discovermagazine.com/2000/oct/featspecies
- Norris, Patricia, producer. "Are Hammerheads a Keystone Species?" National Geographic Xpeditions. (Sept. 12, 2010)http://www.nationalgeographic.com/xpeditions/lessons/08/g68/seasshark.html
- Secretariat of the Convention on Biological Diversity. "Sustaining Life on Earth: How the Convention on Biological Diversity Promotes Nature and Human Well-being." April 2000. (Aug. 29, 2010)http://www.cbd.int/convention/guide/
- World Wildlife Fund. "Know Your Flagship, Keystone, Priority and Indicator Species." (Sept. 12, 2010)http://www.worldwildlife.org/species/flagship-species.html