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.

的方法不是为了试图估算特定区域的海洋中实际动物总数（活着生物的总数），而是研究单位面积中海洋生物数量的变化。

So they consider things like the size of the population — how many members of one species there are in a particular place — and then they look at their distribution in geographical terms.

考虑的是像族群规模（特定地区内某一生物的数量有多少）这样的因素，，便着眼于这些生物在地理上的分布。

They are food for so many of the inhabitants here, and they're so numerous they really dominate the oceans around here.

它是这里许多其它生物的食物，它数量如此之多，它主宰了这片海洋。

And then it bottoms out and starts to get rich again.

“微生物的数量降到低点，再次开始活跃起来。”

Also, the overall number of marine animals has gone down by about half since 1970.

另外，自1970年以来，海洋生物的总体数量已经下降了近一半。

Human activity is the driver of the declines we're seeing, primarily our demand, our increasing demand for food, energy, water.

人类活动导致了当前生物数量的减少，这主要是因为食物、能源和水资源的需求日益上升。

These changes may increase pathogenic organisms or their activity causing a series of oral infectious diseases such as dental caries or periodontal diseases.

这些改变可能会增加致病微生物的数量或提高其活性，从而导致诸如龋齿、牙周疾病等一系列口腔感染性疾病。

And they saw that there was an immediate decline in the number and diversity of gut microbes among the immigrants, compared to their counterparts still living back home.

发现，与生活在故乡时相比，这些移民在进入美国，其肠道微生物的数量和多样性立即下降。

" In the future, climate change is going to be the nail in the coffin for quite a lot of creatures which are already in much-reduced numbers, " says Dave Goulson, a University of Sussex ecologist.

苏塞克斯大学的生态学家戴夫·古尔森说：“在未来，气候变化将成为相当多的生物致命一击，这些生物的数量已经大大减少了。”

Wang said that due to overfishing in the past, the number and diversity of marine life have been damaged, and the artificial reefs are playing a restorative role on the ecosystem.

王教授说，由于过去的过度捕捞，海洋生物的数量和多样性受到了损害，人工鱼礁正在生态系统发挥恢复作用。

A major UN report is set to warn of a global ecological catastrophe calling for immediate action to reverse a dramatic decline across the natural world.

联合国一份重大报告提醒人出现了全球生态灾难 呼吁人立即行动起来 扭转全球自生物数量骤降的局面。

Sweden-based Innoscentia is developing a sensor that can show if meat is safe to eat by measuring the buildup of microbes inside its container.

总部位于瑞典的Innoscentia公司正在开发一种传感器，该传感器可以通过测量肉类容器中微生物的积聚数量来判断肉类是否可以安全食用。

Researchers say these creatures will now reproduce in larger numbers than before because of the extra space created by the rubbish.

研究人员表示，由于垃圾产生的额外空间，这些生物现在的繁殖数量将比以前更多。

People who study science use this word to talk about the number of different kinds of living things on the earth.

研究科学的人用这个词来谈论地球上不同种类生物的数量。

Some scientists estimate that the mass of microbes living deep underground equals the mass of all the life at Earth's surface.

一些科学家估计生活在地下的微生物的数量，跟所有生存在地球表面的生物的数量差不多。

Insects make up the largest class of animals on earth and represent more than half of all known living organisms.

昆虫是地球上数量多的一类动物，占所有已知生物数量的一半以上。

Stool sample analysis revealed significant differences in the diversity and volume of microbes between the monks and their neighbours.

粪便样本分析显示，僧侣和的邻居在微生物的多样性和数量上存在显著差异。

But this still only explains why there's more life, not why there is more different kinds of life.

但这只能解释生物数量的丰富，而不能解释物种的多样。

The width of the bar in the number pyramids represents the number of organisms in that trophic level.

数字金字塔中条形的宽度代表该营养级中生物的数量。

Although this is quite difficult when you're looking at fish, because they're so mobile, and then thirdly the calculate the rate at which the decline of the species is happening.

不过这一点在观察鱼类的时候相当困难，因为它流动性太大了。第三步是计算这种生物数量减少的比率。