蒸发引起的盐度增加导致了无脊椎动物物种的灭绝。
Increasing salinity caused by the evaporation resulted in the extermination of scores of invertebrate species.
据估计，大多数物种的灭绝可能是由于这些影响造成的。
According to some estimates, the majority of all extinctions of species may be due to such impacts.
令人惊讶的是，本土物种的灭绝很少归因于外来物种的竞争。
Surprisingly few extinctions of indigenous species can be attributed to competition from introduced species.
它是控制竞争种群规模的因素之一，在极端情况下，它可能导致一个竞争物种的灭绝。
It is one of the factors controlling the size of competing populations, and in extreme cases it may lead to the extinction of one of the competing species.
无数生物物种的灭绝引起了人们的深切关注，使人们认识到保护濒临灭绝的珍稀动植物的特殊重要性。
The extinction of myriad biological species aroused deep concern which led people to an understanding of the special importance of protecting rare animals and plants on the brink of extinction.
礁石中断记录了每一个的过去五年内主要物种的灭绝。
Reef gaps have marked each of the past five major mass extinctions.
失去雨林无异于数百万物种的灭绝；森林容纳了地球上80%的物种。
Losing the rainforest would mean losing millions of species; forests contain 80% of terrestrial biodiversity.
因为很多物种需要其它物种才能延续下去，所以一个物种的灭绝可能导致多米诺效应。
Because many species need others to survive, the worst possible case for an extinction is a domino-style co-extinction effect.
各个物种的灭绝原因都不相同，而且找不到任何遗传特性来区别灭绝物种与存活物种。
The extinctions differ from species to species, and we don't find any common genetic characteristic to distinguish extinct from surviving species.
生产如此数量的粮食可能大大提高环境中二氧化碳和氮的水平，引起很多物种的灭绝。
Producing that amount of food could significantly increase levels of carbon dioxide and nitrogen in the environment and cause the extinction of numerous species.
时间的确定也表明，陆地物种的灭绝明显由于极度干旱和气候变暖造，其与海洋生物灭绝的同时发生。
The dating also establishes that the extinction on land, apparently driven by extreme drying and warming, happened simultaneously with the marine extinction.
我们完全不知道，但我们知道，每一种物种的灭绝······结果都是在某种程度上对地球生态系统的削弱。
We don't know for sure, but we do know that every species that is removed … results in some weakening of the ecosystem.
结果表明，由于海洋酸度上升，海洋生物的未来暗淡，认为类似持续降低的海洋pH值可能导致了过去大规模物种的灭绝。
The results show a bleak future for Marine life as ocean acidity rises, and suggest that similar lowering of ocean pH levels may have been responsible for massive extinctions in the past.
而这一个小时的雹灾却造成了成千上万次的撞击，产生全球性的火灾并且在“灭绝的边界”(指陨石或陨石坑)沉积了很多“纳米钻石”，造成了当时很多物种的灭绝。
It would have caused thousands of impacts, generating global fires and depositing nanodiamonds at the 'extinction boundary' marking the point in time when many species died out.
边界粘土层被科学家用来确定一个灭绝物种衰落的速度。
Boundary clay layers are used by scientists to determine the rate at which an extinct species declined.
由于自然选择，大多数曾经存在过的物种已经灭绝，所以这不是一个新现象。
Thanks to natural selection, most species that have ever lived has already gone extinct, so this is not a new phenomenon.
撞击产生的烟尘和灰尘覆盖了地球，抑制了光合作用，引发了物种的大规模灭绝。
Airborne soot and dirt from the impact blanketed Earth, inhibiting photosynthesis and triggering mass extinction of species.
我们知道，人类一直是群居的；如果没有这种安排，我们的物种很早之前就灭绝了。
Humans, as we know, have always lived in groups; without this arrangement, our species would have died out long ago.
这些物种中的许多已经消亡或是正濒临灭绝。
Many of these species have vanished or are facing extinction.
濒临灭绝物种的名单中列有将近600种鱼。
一百万年前，我们基本上是濒临灭绝的物种。
A million years ago, we were essentially an endangered species.
地球历史上的这次重大灾难以物种的大量消亡为标志；当时，地球上多达一半的物种都灭绝了。
This break in Earth's history is marked by a mass extinction, when as many as half the species on the planet became extinct.
我们都知道熊猫是一种濒临灭绝的物种。
We all know that panda is a species that is on the edge of extinction.
我相信你们都意识到了大量物种面临灭绝这个令人担忧的情况。
I am sure you're all aware of the worrying situation with a large number of species facing extinction.
在未来的几个世纪里，无论我们传承了多少代人，他们都不会再看到被我们灭绝掉的物种。
However many generations succeed us in coming centuries, none of them will ever see this species that we extinguish.
不管什么原因，恐龙以及地球上几乎半数以上的物种灭绝了。
Whatever the cause, dinosaurs, as well as about half of all species on the planet, went extinct.
不管什么原因，恐龙以及地球上几乎半数以上的物种灭绝了。
Whatever the cause, dinosaurs, as well as about half of all species on the planet, went extinct.
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