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第1段

1 .This is Scientific American 60-Second Science. I'm Steve Mirsky.

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2 ."Noise can prevent an animal from hearing other important sounds."

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3 .Rachel Buxton, a conservation biologist at Colorado State University.

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4 .Buxton and colleagues wanted to see, or rather hear, whether sounds made by human activity-called anthropogenic sound, think airplanes, highway traffic, heavy machinery-were significant in protected areas around the country.

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5 ."Park Service engineers on our team used over a million hours of acoustic measurements taken from 492 sites around the contiguous United States.

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6 .And they built a sound model...so to get at an idea of noise pollution, we used two thresholds: where anthropogenic noise raises sound levels three and 10 decibels above natural."

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7 .Which translates to a doubling and 10-times increase in sound levels.

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8 .Buxton and her team determined that humans were responsible for doubling the sound in 63 percent of protected areas.

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9 .And we raise the natural sound levels by 10 times in 21 percent of such landscapes.

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10 ."These levels are known to impact both the human experience in national parks and have a range of repercussions for wildlife...

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11 .so animals use sounds for many essential life functions, such as predator avoidance, navigation, finding food, mate attraction and maintenance of social groups.

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12 .So not being able to hear these sounds has serious consequences."

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13 .The study is in the journal Science, which also provided the audio of Buxton.

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14 ."The challenge here is managing noise sources that are coming from outside the protected area...

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15 .however, our paper provides some really valuable information and options for managing noise and also enhancing opportunities to enjoy natural quiet."

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16 .Because it's not just the non-human residents of wilderness areas that need some peace and quiet.

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17 .For Scientific American 60-Second Science. I'm Steve Mirsky.

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