段落1
This is Scientific American 60-Second Science. I'm Steve Mirsky.
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"Noise can prevent an animal from hearing other important sounds."
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Rachel Buxton, a conservation biologist at Colorado State University.
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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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"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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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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Which translates to a doubling and 10-times increase in sound levels.
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Buxton and her team determined that humans were responsible for doubling the sound in 63 percent of protected areas.
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And we raise the natural sound levels by 10 times in 21 percent of such landscapes.
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"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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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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So not being able to hear these sounds has serious consequences."
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The study is in the journal Science, which also provided the audio of Buxton.
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"The challenge here is managing noise sources that are coming from outside the protected area...
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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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Because it's not just the non-human residents of wilderness areas that need some peace and quiet.
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For Scientific American 60-Second Science. I'm Steve Mirsky.
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显示原文 =This is Scientific American 60-Second Science. I'm Steve Mirsky.
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显示原文 ="Noise can prevent an animal from hearing other important sounds."
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显示原文 =Rachel Buxton, a conservation biologist at Colorado State University.
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显示原文 =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 / 17
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显示原文 ="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 / 17
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显示原文 =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 / 17
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显示原文 =Which translates to a doubling and 10-times increase in sound levels.
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8 / 17
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显示原文 =Buxton and her team determined that humans were responsible for doubling the sound in 63 percent of protected areas.
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9 / 17
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显示原文 =And we raise the natural sound levels by 10 times in 21 percent of such landscapes.
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10 / 17
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显示原文 ="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 / 17
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显示原文 =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 / 17
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显示原文 =So not being able to hear these sounds has serious consequences."
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显示原文 =The study is in the journal Science, which also provided the audio of Buxton.
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14 / 17
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显示原文 ="The challenge here is managing noise sources that are coming from outside the protected area...
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15 / 17
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显示原文 =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 / 17
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显示原文 =Because it's not just the non-human residents of wilderness areas that need some peace and quiet.
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17 / 17
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显示原文 =For Scientific American 60-Second Science. I'm Steve Mirsky.
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