Invasive species are driving away certain native species.
入侵物种正在驱赶某些本地物种。
Distinctions between exotic and native species are artificial.
外来物种和本地物种的区分是人为的。
Non-native species can appear harmless for decades, then turn invasive.
非本地物种可能会在几十年内看起来无害，继而变得有入侵性。
They can threaten some native species or even destroy and replace others.
它们可以对一些本地物种产生威胁，甚至摧毁和取代其他物种。
What is more, non-native species can appear harmless for decades, then turn invasive.
更重要的是，非本地物种可能会在几十年内看起来无害，然后变得有入侵性。
They prevent fish migrations and change aquatic habitats essential for native species.
它们阻止了鱼类迁徙，并改变了对本地物种至关重要的水生栖息地。
The ecosystem down there can't handle this non-native species. It's destroying the environment.
当地的生态系统并不能应付这个外来物种。它正在摧毁我们的环境。
Dramatic moves are under way to reduce the damage done to native species.
引人注目的办法正在付诸实施以减少对本地物种造成的损害。
In New Zealand, for example, there were about 2, 000 native species of plants.
例如在新西兰曾经有2000种本地植物。
By contrast, trees that sprout naturally are native species and more resilient.
相比之下，天然发芽的树木多为当地树种并且适应性更强。
Invasive animals and plants have devastated native species on many Pacific islands.
在许多太平洋岛屿上，外来动植物已经毁灭了本地物种。
Non-native plants sometimes threaten native species by using up nutrient resources.
有时，非本地植物通过耗尽营养资源而威胁本地物种。
And cats tend to prey on native species, which can cause major ecosystem damage.
且家猫倾向于捕猎当地的物种，这严重损坏了生态系统。
Their population, now in the millions, threatens many native species across Australia.
它们的数量，现在已经上百万，对整个澳大利亚的很多本土生物种群造成了威胁。
The aim of the project on Coal Island is to create a safe haven for endangered native species.
在煤炭岛的该项目的目的是为濒临灭绝的本地生物建立一个安全庇护之地。
But native species disappeared at a rate of roughly two per year, while more than one newcomer arrived.
但是本地土著物种在以大约每年两个的速度消失，而新的外来物种每年却不止一个。
At least 15 countries now host colonies, which frequently prosper at the expense of native species.
目前，至少15个国家受到外来物种的入侵，这种入侵是以牺牲本土物种为代价的。
There are 596 species of livestock and poultry in China, of which over 70 percent are native species.
中国有家畜禽品种、类群596个，其中土著家畜禽品种（类群）占品种总数的70％以上。
And because native species haven't had time to adapt to these new arrivals, many stand defenseless against the invaders.
而本地物种因为没有充分的时间适应入侵者，对它们的“攻城掠地”表现得毫无抵抗之力。
At the Botanical garden on a hill above St John's, two areas showcase native species: the rock garden and the peat garden.
在圣约翰的一座小山上有一个植物园，里边有两个地方展示了本地物种：石园和泥炭园。
Scientists discovered the snails a year and a half later, after they had already pushed some native species close to extinction.
一年半之后，科学家发现了这种蜗牛，但那时它们已经快把当地一些物种推向灭绝的边缘。
Indeed many places, such as large parts of Western Europe, sub-Saharan Africa and Australia, had no domesticable native species at all.
许多地方，如西欧大部，下撒哈拉非洲和澳大利亚，则完全没有可驯化的本地物种。
The Blue Penguin Underpass in Oamaru, New Zealand, provides safe passage for this native species from the nearby harbour to their nests across the busy road.
位于新西兰奥马鲁的蓝企鹅通道保证这些“本土居民”从附近海港穿过拥挤的街道安全抵达家园。
Scientists also fear native species of crab could be overwhelmed like the red squirrel, on the verge of extinction after being pushed out by greys from the US.
科学家同样也担心英国当地的蟹种的生存会受到打压，就像当年从美国引进灰松鼠导致英国本地的红松鼠几乎绝迹一样。
Some of the beasts that have been introduced, such as foxes, eat the native species, or their food, and many imported plants prove invasive and overwhelm the locals.
还有一些引进的动物，如狐狸，它们会吃本土的物种或抢它们的食物，并且许多引进的植物也带有侵略性，他们会破坏本地物种。
"Invasive alien species are non native species which are accidentally or intentionally introduced into new areas. They range from microbes to mammals," Dr MacKinnon says.
麦克·金南博士说，“侵入性外来物种是偶然或故意被引入新地区的非本土物种，其范围涉及从微生物到哺乳动物的多个物种。”
"Invasive alien species are non native species which are accidentally or intentionally introduced into new areas. They range from microbes to mammals," Dr MacKinnon says.
麦克·金南博士说，“侵入性外来物种是偶然或故意被引入新地区的非本土物种，其范围涉及从微生物到哺乳动物的多个物种。”
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