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Ecological extinction is defined as “the reduction of a species to such low abundance that, although it is still present in the community, it no longer interacts significantly with other species.”〔 Ecological extinction stands out because it is the interaction ecology of a species that is important for conservation work. They state that “unless the species interacts significantly with other species in the community (e.g. it is an important predator, competitor, symbiont, mutualist, or prey) its loss may result in little to no adjustment to the abundance and population structure of other species.”〔 This view stems from the neutral model of communities that assumes there is little to no interaction within species unless otherwise proven. Estes, Duggins, and Rathburn (1989) recognize two other distinct types of extinction. Global extinction is defined as “the ubiquitous disappearance of a species."〔Estes et al. ''The ecology of extinctions in kelp forest communities.'' Conservation Biology. 3: 252-264. 1989.〕 Local extinction is characterized by “the disappearance of a species from part of its natural range.”〔 == Keystone species == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ecological extinction」の詳細全文を読む スポンサード リンク
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