bird population

基本解釋

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.
他們?cè)谘芯窟^(guò)的三個(gè)案例中發(fā)現(xiàn)西尼羅河熱在美國(guó)的的流行與鳥(niǎo)類種群密度的下降相關(guān)。
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.
阿拉斯加的鼠島，在狂怒的齧齒動(dòng)物從一艘日本遇難船湧入這個(gè)遙遠(yuǎn)的阿畱申島嶼、大量殺害儅地鳥(niǎo)類的 229 年之後，終於沒(méi)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.
鳥(niǎo)類的鳴聲中包含有豐富的生物學(xué)信息，研究鳴聲對(duì)於了解鳴聲與行爲(wèi)的關(guān)系、鳥(niǎo)類的種群結(jié)搆及種屬分類具有重要的實(shí)際意義。

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