The selectivity index of different plant species changes with grazing The selectivity index of different plant species changes with grazing seasons and stocking rate.
山羊对各种植物的选择性指数随放牧季节和放牧率的不同而发生变化。
When a species goes extinct, it dramatically changes the landscape of biodiversity.
当一个物种灭绝时，它会极大地改变生物多样性的状况。
Because they can reproduce several times each year and produce large numbers of offspring, many insect species can generally adapt quickly to changes in their environment.
由于昆虫每年可以繁殖几次并产生大量后代，许多种类的昆虫通常能迅速适应环境的变化。
Responding to changes in the CF echo's frequency, bats of some species correct in flight for the direction and velocity of their moving prey.
有些种类的蝙蝠会根据回声频率的变化来调整向猎物移动的方向和速度。
Most important, scientists are beginning to realize that the climatic changes have bad a major impact on the evolution of the human species.
最重要的是，科学家们开始意识到气候变化对人类物种的进化有重大的负面影响。
Most important, scientists are beginning to realize that the climatic changes have had a major impact on the evolution of the human species.
最重要的是，科学家们开始意识到，气候变化对人类物种的进化产生了重大影响。
The most important factor for the survival of a species is its ability to compete and adapt to gradual changes in its environment.
一个物种最重要的生存因素是它的竞争能力和适应环境逐渐变化的能力。
Because complex species interactions may be involved, identifying a keystone species by removing the species and observing changes in the ecosystem is problematic.
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。
Long-term effects are primarily mediated by changes in tree species composition and the consequent alterations of forest structure, productivity, and nutrient uptake.
长期影响主要是由树种组成的变化以及随之而来的森林结构、生产力和养分吸收的变化所导致的。
"If the same methodology can be applied, with many minor changes, to other species, that's great," he says.
“如果稍加改变，同样的方法在其他物种上也可以被应用，那将棒极了”他说。
How its people adapt to these changes will determine whether the Refuge prospers or becomes, like the panda, an endangered species.
当地人如何适应这些变化将决定避风港地区是将走向繁荣还是会像大熊猫一样变成濒临灭绝的物种。
Other public gardens across America are also observing earlier bloom times, in addition to changes in temperature and precipitation patterns and distribution of species.
美国其他公共花园也观察到开花时间的提前，以及温度、降水量模式和物种分布情况的改变。
With irradiation from the inside as well as out, it may take much less to cause genetic changes and impair growth and reproduction, even if it's still not enough to kill the species.
在内部和外部放射性同时刺激下，可能只需要更小剂量的辐射就能引起它们的基因改变，并影响它们的生长和繁衍，即使这些辐射仍然不足以杀死这些物种。
Their methods do not attempt to estimate the actual biomass(the amount of living biological matter) of fish species in particular parts of the ocean,but rather changes in that biomass over time.
他们的方法并不是要评估特定海域鱼种的实际生物量，而是评估在这一段时间内生物量的变化。
Their methods do not attempt to estimate the actual biomass (the amount of living biological matter) of fish species in particular parts of the ocean, but rather changes in that biomass over time.
他们的方法并不是要评估特定海域鱼种的实际生物量，而是评估在这一段时间内生物量的变化。
Subsequent work could elucidate exactly how changes in individual genes can, over long periods of time, lead to novel species.
接下来的工作就可以确切的阐述，从长远的角度来看，个体基因中的变化是如何产生新物种的。
This will allow the tracking of changes in the distribution of species in response to, for instance, climate change.
通过这一项目可能可以了解气候变化对物种分布情况的影响。
By understanding which genetic changes have been consolidated in the Belgian blue, it may be possible to design and build similar versions of other species using genetic engineering as a short-cut.
通过认识比利时蓝牛中哪些基因变化得到加强，便可能利用基因工程这个捷径，设计和培育出其他物种的类似品种。
Microevolution looks at changes within species overtime — changes that may be preludes to speciation, the origin of newspecies.
物种的微观进化随时都在发生——变化可能导致物种形成，这就是新物种的起源。
Few changes would be expected in its cranial size and shape, which are critical in characterizing a primate species.
颅骨的大小和外形预计将发生少量的变化，而这些细小的变化对于塑造一个灵长类物种至关重要。
Whereas the cheetah evolved for maximum aerodynamics, its genetic uniformity made the species extremely vulnerable to changes in climate and environment.
尽管猎豹进化的超符合空气动力学，但是它的基因不幸的让它很容易死于气候和环境的变化。
Phenology signals are clearer than changes in species distribution.
物候变化是比物种分布更为清晰的信号。
The researchers documented changes to extinction risk, where species are moving most rapidly toward zero population.
研究人员记录了会导致灭绝风险的物种数量变化事件，在这些事件中，物种的数量快速降到零。
But humankind is luckier than most species. It has the advantage of being able to think ahead, and to prepare for the changes to come.
人类比大多数物种幸运，他具备超前思考，未雨绸缪的优势。
Not every species ages, and some research suggests that drugs or changes in diet may slow metabolism or alter basic aging processes so that we can live longer.
并不是所有物种都伴随有衰老的现象。一些研究表明通过使用某些药物或者改善饮食结构可以减速生物的新陈代谢以及改变基本的衰老过程，以此来帮助我们延年益寿。
Their methods de not attempt to estimate the actual biomass (the amount of living biological matter) of fish species in particular parts of the ocean, but rather changes in that biomass over time.
他们研究了半个世纪以来世界上所有的渔场，其研究方法并不是为了试图估算特定区域的海洋中实际生物总数（活着生物的总数），而是研究单位面积中海洋生物数量发生的变化。
Since the late 1990s, scientists and regional management organisations have used catch data to measure changes in the balance of species across so-called "trophic levels."
自1990年代起，科学家和区域性管理机构就已经开始了数据收集工作，通过对“食物链等级”上不同种群间的生态平衡变化进行定量研究。
In the process of this work, Wells noted that a swath of genetic changes occurred to our species around 12,000 years ago.
在追查的过程中，Wells发现了再大约一万两千年前发生在我们种族上的一列基因的突变。
In the process of this work, Wells noted that a swath of genetic changes occurred to our species around 12,000 years ago.
在追查的过程中，Wells发现了再大约一万两千年前发生在我们种族上的一列基因的突变。
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