这位农学家确信用他的软件能得出接近精准的植物种群数量。
The agronomist is sure that he will obtain a near accurate count of plant population with his software.
如果这些其他物种的种群数量增加，蜱类捕获细菌的数量就会减少，因此感染莱姆病的人数就会减少。
If the population of these other species were increased, the number of ticks acquiring the bacterium and hence the number of people contracting Lyme disease would likely decline.
有一种假说认为，这是一种自然现象；在特别适合产卵的那几年后，刺冠海星自然会经历种群数量的波动。
One hypothesis is that it's a natural phenomenon, that the starfish naturally undergo population fluctuations following particularly good spawning years.
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。
He's the conservation director for Rewilding Argentina, which is one of the organizations helping to restore jaguar populations.
这个故事讲述的是恢复了种群数量的小狐狸，以及一生致力于保护灰狐的人类。
This is the story of the little fox that has come back, and the people who have dedicated their lives to protecting it.
这意味着大象种群数量需要得到控制。
This means that elephant populations will need to be managed.
这让他们能够保持的很大的种群数量。
此外，过去15年中，棕熊种群数量下降高达50%。
Furthermore, brown bear populations have dropped as much as 50 percent in the last 15 years.
这意味着更少的受精卵，更少的幼崽和更小的种群数量。
That means fewer fertilized eggs, fewer babies and smaller populations.
相比之下，亚热带海洋的浮游植物的种群数量在夏季回落。
In the subtropical oceans, by contrast, phytoplankton populations drop off in summer.
旅鼠，驯鹿和红腹滨鹬(一种滨鸟)的种群数量都有所下降。
Populations of lemmings, caribou and red knot (a shorebird) have all decreased.
他们根据两个基因组中的基因差异，计算远古时期的种群数量。
They used the number of those genetic differences between the two genomes to calculate how large the population was at that time.
不过好消息是我们也发现老虎的种群数量是可以恢复的。
But the good news is we have also found that tiger populations can recover.
“人类对鲟鱼的种群数量的影响可以是迅速而轻易的，”黑尔说。
"Humans can have an effect very quickly and very easily on the sturgeon population," Hale said.
海洋浮游植物种群数量可因环境条件的变化而增长或下降。
Populations of this Marine plant will grow or diminish rapidly in response to changes in its environment.
一个担心是，损坏了磷虾种群数量将引起一系列影响其它生物的变化。
The fear is that devastating the krill population will set in train a series of changes that will affect other creatures.
如果它们的种群数量，行为，身体状态发生变化，会暗示出更多的问题。
If their population Numbers, behavior, or physical condition change, it can indicate larger problems.
它经历了三次主要的种群数量下降——每次之前有一个极其干热的年份。
It went through three major population declines — each preceded by an extremely dry and hot year.
一旦条件成熟，浮游植物种群数量会呈爆炸性增长，这一现象被称为水华。
When conditions are right, phytoplankton populations can grow explosively, a phenomenon known as a bloom.
伴随着巨大的种群数量和贪婪的食性，兔子开始蚕食羊的放牧场。
With their huge Numbers and voracious appetites, they began eating the sheep's rangeland.
当一个物种的种群数量稀少而又不得不近亲繁殖时，灭绝就会发生。
And this is what happens with small populations and inbreeding of close relatives.
另一个指标，地球生命指数，是1 686种脊椎动物的种群数量变化的平均数。
Another indicator, the Living Planet Index, averages changes in the sizes of populations of 1, 686 vertebrate species.
非法捕捞能在多大程度上得到控制也会对种群数量是否有机会恢复具有重大影响。
The extent to which illegal fishing can be brought under control will also have a big impact on whether the population has a chance of recovering.
意外发生时，考察队伍正在南非开普海岸莫塞尔湾海豹岛附近进行鲨鱼种群数量研究。
The incident occurred while the research team was conducting a shark population study off Seal Island, near Mossel Bay, on South Africa's Cape coast.
第二，虽然熊破坏一些树木，但是他们却不是整个黄杉种群数量下降的原因。
Second, although bears damage some trees, they are not the cause of the over all population decline.
对空间的需求很可能导致其种群数量偏低，以致于在遭遇困难时期，这些巨型鳄鱼更容易灭绝。
So space constraints likely kept population Numbers low-making the giant crocs vulnerable to extinction in tough times.
正如我们所知，近年来全球鲨鱼种类正如预计的那样急剧减少，甚至某些种群数量的降幅达97％多。
We already knew that shark species around the world have experienced dramatic declines in recent years, with some species down 97 percent or more.
这种单细胞生物吃糖，而且繁殖迅速——如果有足够的食料，他们的种群数量可以每九十分钟增加一倍。
This single-celled fungus feeds on sugars and reproduces frequently—if it has enough to eat, a culture can double in population in 90 minutes.
他目前的研究范围从研究鲑鱼的动态系统和鳕鱼种群数量到建造植物和动物物种应对全球气候变化的模型。
His current studies range from researching the dynamics of salmon and cod populations to modeling plant and animal species' response to global climate change.
他目前的研究范围从研究鲑鱼的动态系统和鳕鱼种群数量到建造植物和动物物种应对全球气候变化的模型。
His current studies range from researching the dynamics of salmon andcod populations to modeling plant and animal species' response toglobal climate change.
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