The Croatian town of Ilok is a classic case of shifting populations.
伊洛卡的克罗地亚小镇就是人口不停流动的典型例子。
They had not been exposed to most diseases common to urban populations.
他们未曾遭遇城市人口常得的大多数疾病。
As populations grow, food becomes a problem.
随着人口的增长，食物成了一个问题。
This depends on how dense their populations are.
这个取决于他们人口的稠密度。
However, by 1750, hunters had also targeted nearby sea otter populations.
然而，到了1750年，猎人们也开始瞄准附近的海獭种群。
It can also be exploitative, especially when used with vulnerable populations.
它也可以是剥削性的，特别是用于弱势群体的时候。
How did those dense southern Maya populations deal with the resulting water problem?
玛雅南部人口这么秘籍，他们是如何应对由此产生的水问题的？
Societies that cannot replace their populations discourage investment and innovation.
无法更新迭代其人口的社会阻碍了投资和创新。
The herbicide might damage populations of certain rare plant species that the lake contains.
除草剂可能会破坏湖泊中某些稀有植物的种群。
Moreover, IQ tests do not necessarily predict so well once populations or situations change.
而且，一旦种群或环境发生变化，智商测试就不一定预测得那么准确。
This imbalance of lateralization within populations may also have advantages for individuals.
这种群体内部的偏侧性不平衡对个体也有好处。
Further studies are needed to prove the findings in other populations, settings and climates.
需要进一步的研究来证明在其他人群、环境和气候中的发现。
This is most evident in cases where it results in the extinction of entire salmon populations.
这在导致整个鲑鱼种群灭绝的案例中最为明显。
These same cycles of change had momentous impacts on the sparse human populations of the region.
这些相同的变化周期对该区域稀少的人口产生了重大影响。
Krebs investigated experimental plots in Canada's Yukon territory that contained hare populations.
克雷布斯调查了加拿大育空地区含有野兔种群的试验田。
When the glaciers retreated, the separated populations of plants and animals came into contact again.
当冰川消退，分离的动植物种群再次接触。
Agriculture developed slowly among populations that had an extensive knowledge of plants and animals.
农业在拥有丰富动植物知识的人群中发展缓慢。
Later on, it became very difficult to change because of the significant expansion of these populations.
后来，由于这些人口的大量增加，改变变得非常困难。
Populations cannot grow unless the rural economy can produce enough additional food to feed more people.
除非农村经济能够生产足够的额外粮食来养活更多的人，否则人口不可能增长。
Although some rivers have been recolonized, the unique genes of the original populations have been lost.
尽管一些河流被重新殖民，但原始种群的独特基因已经消失。
They hypothesize that language diversity must be about history, cultural differences, mountains or oceans dividing populations.
他们假设，语言多样性一定与历史、文化差异、山脉或海洋分隔人口有关。
States with the most racially diverse populations stand in stark contrast to those with the least racially diverse populations.
人口种族最多样化的州与人口种族最不多样化的州形成了鲜明的对比。
How do predators affect populations of the prey animals?
捕食者如何影响猎物的数量？
Lionfish populations have exploded in the past few years.
狮子鱼的数量在过去几年里激增。
In the absence of wolves, coyote populations also grew quickly.
在没有狼的情况下，土狼的数量也迅速增加。
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