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题目内容
题目材料：
Among the scientific anachronisms in the United States Endangered Species Act is the absence of specific reference to interactions among species, which can greatly affect ecological and species diversity. It is now understood that the disappearance of a strongly interactive species can cause profound changes in ecosystem composition and structure. For instance, decimation of great whales by industrial whaling affected other species that, like the whales, consume krill(small, shrimplike crustaceans), and the dynamics of coastal marine ecosystems worldwide have been greatly altered by overfishing of certain species. Decreased numbers and reduced geographic range may render a species functionally extinct in terms of its interactions well before the species itself has completely disappeared. Nevertheless, most conservation laws emphasize short-term, single-species demographic viability in only
a few circumscribed areas.
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