其次，地峡两侧紧密相关的鱼类种群似乎开始在基因上彼此分化。
Second, it appears that closely related populations of fishes on both sides of the isthmus are starting to genetically diverge from each other.
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。
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.
很多网站已经使用这种群智(crowd - sourcing)技术来确定搜索结果的相关性。
Websites have tapped into these crowd-sourcing techniques to determine the relevance of search results.
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