That's what a keystone species does in an ecosystem.
那就是拱顶石物种在生态系统中的作用。
They believed that the greater the diversity the more stable the ecosystem.
他们认为，生物多样性越丰富，生态系统就越稳定。
We're bringing new blood into the old, conventional farming ecosystem, which is really cool to see.
我们正往古老的传统的农业生态系统中注入新鲜血液，这看起来确实很酷。
In Europe, it is undoubtedly the mountain ecosystem which has changed most rapidly and is most at risk.
在欧洲，变化最快、风险最大的无疑是山地生态系统。
See if you can identify the jellyfish you observed on the beach and how they fit into the local ecosystem．
你看看能不能识别出你在沙滩上观察到的水母，以及它们是怎样融入当地的生态系统的。
When snorkeling, do not touch the coral or stir up sediment, as these actions can damage the reef's fragile ecosystem.
潜泳的时候，不要碰珊瑚礁或者搅动沉淀物，因为这样做可能会破坏珊瑚脆弱的生态系统。
Managing ecosystems sustainably is more profitable than exploiting them, according to the Millennium Ecosystem Assessment.
根据千禧生态系统评估报告，可持续地管理生态系统比掠夺消耗它更有好处。
A number of scientists question the assumption that the presence of alien species can never be acceptable in a natural ecosystem.
一些科学家质疑这样的假设，即在自然生态系统中，外来物种的出现是绝对不会被接受的。
A real and pressing issue is that many plant species have not yet been cataloged, and so their place in the ecosystem is unknown.
一个现实而紧迫的问题是，许多植物物种还没有被编目，因此它们在生态系统中的位置是未知的。
Mathematical models of ecosystems likewise suggest that diversity does not guarantee ecosystem stability—just the opposite, in fact.
生态系统的数学模型同样表明，多样性并不能保证生态系统的稳定性——事实上恰恰相反。
Shifts in forest species composition ramify through the ecosystem in many ways because tree species have different, often unique properties.
由于树种具有不同的、往往是独特的特性，森林物种组成的变化以多种方式影响着生态系统。
The rich, green canopy is teeming with life, and forest researchers have developed ingenious methods for accessing this mysterious ecosystem.
富饶的绿树冠上充满了生命，森林研究人员已经研究出了进入这个神秘生态系统的巧妙方法。
Alternatively, stability can be defined as the speed with which an ecosystem returns to a particular form following a major disturbance, such as a fire.
或者，稳定性可以被定义为生态系统在发生重大扰动，如一场火灾后，恢复到特定形式的速度。
A decade ago, this island's ecosystem was in chaos. Wild pigs attracted golden eagles from the mainland, and those flying predators crashed the fox population.
十年前，这个岛的生态系统处于混乱状态，野猪吸引了来自大陆的金雕，而那些飞行的捕食者又使狐狸的数量锐减。
This ecosystem is one of the fascinating paradoxes of the biosphere: how do clear, and thus nutrient-poor, waters support such prolific and productive communities?
这个生态系统是生物圈中令人着迷的悖论之一：清澈而又缺乏营养的水域是如何支撑如此多产的群落的？
Wait, I see where you are heading with this, but before we go into how European settlement affected the ecosystem, tell me this—what kind of environment do beavers live in?
等等，我明白你的意思了，但在我们讨论欧洲人的定居如何影响生态系统之前，告诉我，海狸生活在怎样的环境中？
Scientists say both studies demonstrate that certain parts of the ecosystem respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.
科学家称这两项研究都表明，生态系统的某些部分对于大气污染的减少反应迅速，但这些发现不应该成为允许污染的理由。
Sharks are at the top of the food chain in the ocean's ecosystem.
在海洋生态系统中，鲨鱼处于食物链的顶端。
These different parts of a rainforest exist together to create an ecosystem for many animals, plants and human beings.
雨林的这些不同部分共同存在，为许多动植物以及人类创造了一个生态系统。
As long as people live here, the ecosystem thrives.
只要有人还住在这里，生态系统也会继续繁荣。
Over time, they have formed the nucleus of our new social ecosystem.
随着时间的推移，他们成了我们新的社交圈子的核心。
The PC hardware ecosystem has made huge advances over the last few years.
PC硬件的生态系统在过去短短的几年中取得了巨大的进步。
Will these alien genes harm the fragile ecosystem upon which we all depend?
这些异种基因会不会破坏我们赖以生存的、脆弱的生态系统？
We learn of complex water habitats and a fragile ecosystem of flora and fauna.
导游向我们介绍，这片水域生境的植物和动物生态系统复杂而脆弱。
They are insects, tiny yet very important inhabitants of our planet ecosystem.
它们就是昆虫，虽然渺小却是我们地球生态系统的重要居民。
They are insects, tiny yet very important inhabitants of our planet ecosystem.
它们就是昆虫，虽然渺小却是我们地球生态系统的重要居民。
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