它是保持系统继续运行的关键物种。
似乎某些特征会清楚地将一个物种定义为关键物种。
It might seem that certain traits would clearly define a species as a keystone species.
因此，在理解和预测全球变化对南极和亚南极海洋生态系统影响方面，它们是关键物种。
As such, they are key species for understanding and predicting impacts of global change on Antarctic and sub-Antarctic marine ecosystems.
由于其中可能涉及复杂的物种相互作用，通过移除一个关键物种并观察生态系统的变化来确定该物种是有问题的。
Because complex species interactions may be involved, identifying a keystone species by removing the species and observing changes in the ecosystem is problematic.
关键物种的灭绝可能通过食物链产生级联效应。
The extinction of key species could have cascading effects throughout the food web.
关键物种的保护是维持黄河健康的重要措施之一。
To protect key species is one of the important measures for keeping healthy life of the Yellow River.
而且我们也需要它们——它们是从建造珊瑚礁，到稳固海洋食物链，再到美味的蛤蜊酱意面的关键物种。
And we need them — they are keystone species for everything from building coral reefs to anchoring the ocean food chain to making a killer linguine and clam sauce.
榕属植物为多种食果动物重要的食物资源，特别是在其他果实缺乏的季节，因此有关键物种之称。
Figs (Ficus SPP., Moraceae) are important fruit resources for many frugivores, particularly during the period when other fruits are scarce, and so be called "keystone species".
对它的保护对维持南极物种繁衍可持续性来说很关键。
Its conservation is key to the sustainable propagation of Antarctic species.
对语言中的数词研究不断表明，我们物种的关键特征之一就是庞大的语言多样性和认知多样性。
Research on the language of numbers shows, more and more, that one of our species' key characteristics is tremendous linguistic and cognitive diversity.
我们将失去关键的一部分，这部分能使人类成为如此成功的物种。
We will lose a vital part of what has made humanity as a whole so successful as a species.
第一个和第三个可能是生物群落结构的关键因素；也就是说，所有的生物种群都生活在一起，并且它们可能在一个特定的区域内相互作用。
The first and the third can be key factors in the structure of a biological community; that is, all the populations of organisms living together and potentially interacting in a particular area.
我们正处于一个世界历史的关键时刻，海洋和森林在遭到破坏，物种正在逐渐消失，气候发生着变化。
We are at a crucial point in the world's history — our oceans and forests are suffering, species are disappearing, the climate is changing.
细菌不仅仅是单独的细胞，也不只是一个个群体，而是一个多物种群落，相互联系交流，关键这其中还包括我们人类。
Bacteria aren't just isolated cells, or even isolated populations, but multi-species communities that communicate with each other and, crucially, us.
但最新科学研究则把研究重点放在有多少生存空间可以利用方面，而不是此前以为的关键进化因素——物种竞争。
But new research identifies the availability of "living space", rather than competition, as being of key importance for evolution.
这些物种在其所处的小型生态系统中可能发挥着关键性的作用，一旦消失，即使还有许多相关的物种，也会导致整个生态系统发生改变。
Such species may be key to the survival of their small ecosystem and their loss, even among many related species, can alter an entire ecosystem.
南非有五分之一的水生物种濒临灭绝，数百万的南非人可能会丢失一种生存资源的关键来源。
Millions of Africans may lose a key source of livelihoods as a fifth of freshwater African species are threatened with extinction
对大象和其他物种来说，这片山地森林保护区是它们赖以生存的关键，但人类村落的不断扩展会切断它们通往水源的道路。
Upland forest reserves are vital for these and other species, but expanding human settlement could sever access.
因为有些物种受保护有些不受，对野生动物罪案调查者来说确定受害者正确的物种是很关键的。
Because some species are protected and others are not, it is essential that wildlife crime investigators determined the exact species of their victims.
大型捕食者是使主要的物种种群不会生长过大的关键因素。
Top predators are key to keeping populations of key species from growing too large.
物种一旦消失就再也找不回来了，随物种一同丢失的可能还有某种疾病的治愈之法、对进化史的新见解、生态链中的其他关键角色等等。
Species can be lost forever, and with it, possible cures for disease, insights into the history of evolution, critical members of ecosystems.
伦敦动物学会（Zoological Societyof London）蝙蝠专家凯特·琼斯说，“它们也是关键的指标物种，能提供有关生态系统健康状况的信息。
They are also a key indicator species that can provide information on the health of an ecosystem.
“适者生存”是物种不断变化的关键。
The "survival of the fittest" was the key to the constant change in species.
“适者生存”是物种不断变化的关键。
The "survival of the fittest" was the key to the constant change in species.
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