生态学家曾一度认为，物种多样性使生态系统变得稳定。
At one time, ecologists believed that species diversity made ecosystems stable.
然而一个同样重要的标准是，物种在随机性全球生态灾难中幸存的能力。
Yet an equally important criterion is the ability of a species to survive random global ecological catastrophes due to impacts.
许多生态学家说，这些入侵物种仅次于栖息地的丧失，是对全球生物多样性的最大威胁。
Next to habitat loss, these invasive species represent the greatest threat to biodiversity worldwide, many ecologists say.
当发生燃烧时，它阻止了植物物种之间的竞争发展到某些物种排斥其他物种的程度，减少了生态系统的整体多样性。
When burning occurs, it prevents competition among plant species from progressing to the point where some species exclude others, reducing the overall diversity of the ecosystem.
生态学家警告说，外表可能具有欺骗性，而且这些外来物种中可能有许多是为人接受的，只是因为没有人记载过其有害影响。
Appearances can deceive, ecologists caution, and many of these exotics may be considered acceptable only because no one has documented their harmful effects.
很难知道海龟是否像纽约这样的地方哪里的生态环境适合海龟，因为这里人口密集且有许多攻击性物种。
It's hard to know where turtles fit into the ecosystem of a place like New York City, rife with pollution and a melange of invasive species.
由于气候变暖，很多生态环境中的物种更快消失的可能性增加；大力扩张耕地使得情况更加糟糕。
Faster loss of species is highly likely in many ecosystems as a result of warming; greatly expanding farmlands will make this worse.
但是华盛顿州立大学的昆虫生态学家克劳德的研究显示平衡的重要性——各种物种相对充盈。
But the research by Crowder, an insect ecologist at Washington State University in Pullman, and his colleagues, shows the importance of 'evenness' - the relative abundance of different species.
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.
并从指示物种，结构-功能-组成，压力-响应等方面介绍了生态系统完整性评价指标；
The indicators of ecosystem integrity can be grouped into indicator species, structure-function-composition indicators, and stress-response indicators.
生态系统一旦失去其丰富性，同时也会失去其恢复性，面对气候变化、外来物种入侵和其他骚扰，它们会变得更加脆弱。
When ecosystems lose biological richness, they also lose resilience, becoming more susceptible to the effects of climate change, invasions of alien species, and other disturbances.
随着科学家的研究深入，进一步认识到多物种间相互影响的重要性，在进行渔业管理时，开始应用海洋生态系统多物种模型。
With a deeper research by scientist, the importance of the interaction of multi-species is realized. A marine ecosystem multi-species model is applied to manage fishery.
如果人人都能了解保护我们外围自然生态美的重要性，就不必再听到“物种一旦灭绝便永远灭绝了。”及“我们只有一个地球。” 这样的警语了。 。
"Extinction is forever" and "There is only one world" need no longer be heard one becomes conscious of preserving the beauty of the natural world around us.
外来侵害性物种会打乱生态平衡，常常导致一些当地物种灭绝。
Invasive species can and often do upset the ecological balance and wipe out local varieties.
生态平衡被打破的后果是灾难性的，因此保护濒危物种迫在眉睫。
The consequences of the disrupted ecological balance are catastrophic, so it is imperative to conserve endangered species.
检验自然选择在物种形成中的作用的一个主要挑战是，将生殖隔离的出现与有着生态学重要性的特征联系起来。
A principal challenge in testing the role of natural selection in speciation is to connect the build-up of reproductive isolation between populations to divergence of ecologically important traits.
本文以草珊瑚为研究对象，从保护生物学角度，对该物种进行了群落生态学和居群遗传学的基础性研究。
From conservation biology viewpoint, we carried out basic researches including community ecology and population genetics on this wild medicinal plant.
本文以草珊瑚为研究对象，从保护生物学角度，对该物种进行了群落生态学和居群遗传学的基础性研究。
From conservation biology viewpoint, we carried out basic researches including community ecology and population genetics on this wild medicinal plant.
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