bird population

基本解释

Three of the cases they studied found that the rise of West Nile virus in the U.S. corresponded to decreases in bird population density.
他们在研究过的三个案例中发现西尼罗河热在美国的的流行与鸟类种群密度的下降相关。
Alaska's Rat Island is finally rat-free, 229 years after a Japanese shipwreck spilled rampaging rodents onto the remote Aleutian island, decimating the local bird population.
阿拉斯加的鼠岛，在狂怒的啮齿动物从一艘日本遇难船涌入这个遥远的阿留申岛屿、大量杀害当地鸟类的 229 年之后，终于没有老鼠了。
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Bird songs and calls as one of the most important features, which contain abundant biological information, are vital for the research of Avi-behavior, bird population structure and classification.
鸟类的鸣声中包含有丰富的生物学信息，研究鸣声对于了解鸣声与行为的关系、鸟类的种群结构及种属分类具有重要的实际意义。

Before the experiment got under way, they surveyed the bird population in every patch of woodland each season for two years—in other words, eight times in all.
ECONOMIST: Ecology: Under the mistletoe The
No-till, practised more in America than in Britain, means growing crops without ploughing fields, and leads to many-fold increases in bird population and a range of other environmental benefits.
ECONOMIST: What the birds and bees say