Plenty of experiments, albeit accidental ones, have already demonstrated that subtracting even one species can change an eco-system.

许多实验，除个别例外，已证明即使是一个物种的减少也能改变一个生态系统。

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Lewison said that long-lived species are particularly affected by accidental entanglement in fishing lines, because these species take so long to reproduce.

刘易森称，长命物种很容易被钓丝意外缠住，因为这些生物需要很长时间才能繁殖。

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Introductions of new species, both accidental and deliberate, over the past few centuries show the problem.

在过去的几百年里，不管是有意地还是无意地引进新物种，都暴露出一些问题。

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In summary, Dr Saetre and his colleagues have vindicated Dobzhansky and thus confirmed a mechanism for the origin of species that is directly caused by natural selection, rather than being an accidental by-product of it.

ECONOMIST: Evolution