Zone de Texte: Environmental damage Zone de Texte: Examples of direct consequences of pest effects on plants include: reduction of keystone species A keystone species has a major impact on an ecosystem. The impact is disproportionately large compared to the species‘ abundance. The name derives from the center stone in an arch supporting its weight by inward-leaning stones.  Removal of the keystone causes the arch to collapse. Keystone species Zone de Texte: Gritta Schrader October 2004 Zone de Texte: Federal Biological Research Center for Agriculture and Forestry Department for Plant Health, Braunschweig, Germany

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