而且一种生态系统越来越多物种的离开，也意味着沼泽、树林或池塘将失去其独特性，变为其他，这是一种体系水平的灭绝。

And taking more and more species from an ecosystem raises concerns that the swamp, woods or pond will lose its distinctive traits, becoming something else, in a form of system-level extinction.

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像河流和小溪那样的流水称为激流生态系统；像湖泊和池塘的死水称为静水生态系统。

Flowing waters like rivers and streams are called lotic ecosystems; standing water like lakes and ponds are lentic.

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而每个池塘都有其独有的生物序列，从浮游生物到鱼类各不相同，这一特点甚至适用于人造的池塘生态系统。

Each pond often has a unique array of species, from plankton to fish-even if it was created by scientists.

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