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Definition of Keystone species

Keystone species Definition from Science & Technology Dictionaries & Glossaries
Bioglossary
Description: A species whose loss from an ecosystem would cause a greater than average change in other species populations or ecosystem processes; species that have a disproportionately large effect on other species in a community.
Source: Global Biodiversity Assessment GBA Land tenure Description: The right to exclusively occupy and use a specified area of land. Tenure may also be limited to certain resources ("resource tenure") such as timber but not to all resources in a given area. Tenure may be held by individuals, communities, government, or corporations.
Source: Global Biodiversity Assessment GBA
© European Communities, 1995-2004
Glossary of Marine Biology
A predator at the top of a food web, or discrete subweb, capable of consuming organisms of more than one trophic level beneath it
Keystone species Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
A keystone species is a species that has a disproportionately large effect on its environment relative to its abundance. Such species are described as playing a critical role in maintaining the structure of an ecological community, affecting many other organisms in an ecosystem and helping to determine the types and numbers of various other species in the community.

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