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keystone species
(english) A species whose loss from an ecosystem would cause a greater than average change in other species populations or ecosystem processes; whose continued well-being is vital for the functioning of a whole community, such as the herring in the North Atlantic or krill in Antarctica. (See also: indicator species, ecosystem, conservation)
(french) Espèce dont la disparition causerait à un écosystème un changement trop grand pour les autres espèces de l'écosystème ; ou bien espèce dont le bon état est vital pour le fonctionnement d'une communauté entière, tel le hareng en Atlantique nord. (See also: indicator species, ecosystem, conservation)
espécie importante no ecossistema
(portuguese) Espécie que se desaparecer do ecossistema causará um maior prejuízo do que as alterações médias noutras espécies. (See also: indicator species, ecosystem, conservation)

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