Birds sing softly in pandemic

　　疫情期间鸟类叫声更低

　　San Francisco birds started singing differently in the quiet of the coronavirus lockdown, according to a study in Science.

　　《科学》杂志的一项研究称，旧金山的鸟儿在安静的疫情封锁期间叫声发生了改变。

　　Before, the urban white-crowned sparrow's breeding territories were almost three times as loud as rural territories, the study found.

　　研究发现，之前白冠麻雀在城内繁殖地区的噪音是乡下的三倍。

　　But during the pandemic, researchers noted noise levels in urban areas were drastically lower.

　　但是在疫情期间，研究人员注意到，城区的噪音大大降低。

　　In fact, they were consistent with traffic flow in the mid-1950s.

　　事实上，这一噪音水平和上世纪50年代中期的交通噪音水平持平。

　　"We found birds sang more softly when noise levels were lower," researchers said.

　　研究人员称："我们发现，当噪音水平降低时，鸟儿叫声更轻柔。"

　　Even though the birds were singing more softly, the study found communication distances nearly doubled, elevating species fitness and increasing mating potential.

　　虽然鸟儿用更轻柔的声音唱歌，但研究发现它们的沟通距离几乎翻倍，增强了物种的体力，提高了交配的可能性。

　　"In addition, the signal-to-noise ratio doubled, which helps explain media reports suggesting bird songs sounded louder during the shutdown," the researchers said.

　　研究人员称："此外，信号噪声比的加倍有助于解释媒体关于鸟叫声在封锁期间听起来更嘹亮的报道。"

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