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。
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。
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。
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。
It's in these populations that we begin to see real changes in the genetic makeup of natural coloring.
正是在这些种群中，我们开始看到自然色彩的基因构成发生了真正的变化。
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。
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。
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。
Study of the origins and distribution of human populations used to be based on archaeological and fossil evidence.
对人类种群起源和分布的研究曾是基于考古和化石证据。
Without upgrades and new capacity, bridges, roads and power systems are unable to cope with expanding populations.
如果没有升级和新的技能力，桥梁、道路和电力系统就无法应对不断增长的人口数量。
Ecologists studying hare populations have found that the North American snowshoe hare follows a roughly ten-year cycle.
生态学家在研究野兔种群时发现，北美雪兔的生长周期大约为10年。
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。
They hypothesized 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。
Indeed, most analysts believe that some kind of environmental degradation underlies the demise of many extinct salmon populations.
事实上，大多数分析家认为某种环境退化是许多已灭绝鲑鱼种群消亡的根源。
Culture is also passed on among people of the same time or among people belonging to different populations.
文化也在同一时代的人之间或属于不同种族的人口之间传递。
He's the conservation director for Rewilding Argentina, which is one of the organizations helping to restore jaguar populations.
他是阿根廷再野化组织的保护主任，该组织是帮助恢复美洲虎种群数量的组织之一。
Millions of acres of wetlands were dried to feed and house the ever-increasing populations, greatly reducing waterfowl habitat.
为了解决不断增长的人口的吃住需求，数百万英亩的湿地都被抽干，从而极大地减少了水禽的栖息地。
How do predators affect populations of the prey animals?
捕食者如何影响猎物的数量？
It may benefit populations whose traditional diet is meat-based.
它可能有益于那些传统饮食以肉类为主的人群。
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