At one time, ecologists believed that species diversity made ecosystems stable.
生态学家曾一度认为，物种多样性使生态系统变得稳定。
Species that invade a territory can harm ecosystems, agriculture and human health.
入侵一个地区的物种会危害生态系统、农业和人类健康。
Ecologists concluded that the apparent stability of climax ecosystems depended on their complexity.
生态学家认为，顶极生态系统呈现出的稳定性取决于其复杂程度。
Coral reefs are one of the most fragile, biologically complex, and diverse marine ecosystems on Earth.
珊瑚礁是地球上最脆弱、生态性最复杂、最多样化的海洋生态系统之一。
Finally, the conference established the framework for a European research network on forest ecosystems.
最后，会议为欧洲森林生态系统研究网建立了框架。
We can also protect the reefs by protecting the surrounding ecosystems, like mangrove forests and seagrass beds.
我们保护珊瑚礁的方法还有保护周边的生态系统，比如红树林和海草丛。
This raises unique challenges for Arctic wildlife and indigenous people who depend on Arctic ecosystems to survive.
这对依赖北极生态系统生存的北极野生动物和土著居民提出了独特的挑战。
Ecologists use the term "succession" to refer to the changes that happen in plant communities and ecosystems over time.
生态学家使用“演替”一词来指植物群落和生态系统随时间发生的变化。
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。
"The health of ecosystems on which we and all other species depend is deteriorating more rapidly than ever," Robert Watson said.
罗伯特·沃森说：“我们和其他所有物种赖以生存的生态系统的健康正以从未有过的速度恶化。”
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。
As a habitat for many endangered species, the Yangtze River flows through diverse ecosystems and irrigates one-fifth of China's land.
长江流经多种不同的生态系统，是诸多濒危物种的栖息地，灌溉了中国五分之一的土地。
Plant life balances ecosystems, protects watersheds, mitigates erosion, moderates climate and provides shelter for many animal species.
植物平衡了生态系统、保护了流域、减缓了侵蚀、缓和了气候，为许多动物物种提供了庇护所。
At its core, the debate is about how to manage the world's remaining natural ecosystems and about how, and how much, to restore other habitats.
这场争论的核心是如何管理世界上留存的自然生态系统，以及如何和在多大程度上恢复其他栖息地。
There is, however, increasing concern about the impact of fishing and other human activities on marine ecosystems, which are now far from pristine.
然而，人们越来越关注捕鱼和其他人类活动对海洋生态系统的影响，因为现在海洋生态系统远非原始状态。
Located in tropical areas at low altitudes, savannas are stable ecosystems, some wet and some dry consisting of vast grasslands with scattered trees or shrubs.
"热带稀树草原位于热带地区，海拔较低，是一种稳定的生态系统，由广阔的草地和稀疏分布其中的树木或灌木组成，有些地区湿润，有些地区干燥。
Today's report is the starkest warning yet of the potentially devastating impact of climate change and human exploitation on the Antarctic's delicate ecosystems.
今天的报告是迄今为止对气候变化和人类开发对南极脆弱生态系统的潜在破坏性影响发出的最严厉警告。
Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems.
数学模型也揭示了食物网可能是不稳定的，顶级肉食性动物的微小改变会对整个生态系统产生巨大影响。
Several current studies are looking at these effects and I really do hope we can find a way to deal with this issue before these ecosystems are adversely affected.
目前人们针对这些影响在做一些研究，我真的希望能在生态系统遭到破坏之前找到应付这个问题的方法。
From the standpoint of a traditional educator, this outcome indicated that schooling had failed to help students think about ecosystems and extinction, major scientific ideas.
从传统教育家的角度来看，这一结果表明，学校教育未能帮助学生思考生态系统和物种灭绝等主要科学思想。
By studying the whale fall scientists can better understand how sea ecosystems support life.
通过研究鲸落，科学家可以更好地了解海洋生态系统是如何给生命提供支持的。
He also writes articles, hoping that more people will join in protecting natural ecosystems.
他也写文章，希望更多的人加入保护自然生态系统的行列。
"In the absence of this species, ecosystems stop working well and may even collapse," Di Martino says.
“如果没有这一物种，生态系统就无法正常运转，甚至可能崩溃。”迪·马蒂诺说。
This view is especially evident on Kilimanjaro as climbers go through five ecosystems in the space of a few kilometers.
在乞力马扎罗，当登山者在几公里的空间里穿越五个生态系统时，景色差异尤为明显。
These lush forests are the world's most diverse ecosystems.
这些茂密的雨林有着世界上最多样的生态系统。
Conservation isn't just saving species and ecosystems, it's saving humans.
保护鲨鱼并不仅仅是为了挽救物种和生态系统，而是挽救我们人类。
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