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This is Scientific American's 60-second Science, I'm Christopher Intagliata.
The barred owl has a very distinctive call.
"It's the one that goes, 'Who cooks for you?'"
(CLIP: Barred owl call sample)
Connor Wood is a conservation biologist and applied ecologist at the University of Wisconsin–Madison—who does a pretty great barred owl impression himself.
(CLIP: Impression of barred owl)
Barred owls are native to the eastern U.S. But in the last century, they've crossed the Great Plains, flooded into Canada and taken up roost in the Pacific Northwest, where they're a major threat to northern spotted owls.
"Barred owls are bigger and more aggressive. And so barred owls have been able to basically drive spotted owls out of their preferred nesting areas. And also, because they're more flexible with what they eat, there can be more barred owls on the landscape."
And now they're invading the Sierra Nevada mountains, further south—the native range of the California spotted owl.
"And the big question was: What is the size of the barred owl population there, and how fast is it growing?"
To answer that, Wood and his team deployed audio recorders in roughly 1,000 locations throughout 2,300 square miles of the northern Sierra Nevada. And then they listened—for two years—collecting the faint calls of spotted owls...
(CLIP: Spotted owl)
...and barred owls, too.
(CLIP: Barred owl)

In total, they gathered 200,000 hours worth of audio.
"It was pretty daunting, seeing it all accumulate and knowing we had to make something intelligible out of it."
Algorithms that combed the audio for owl calls helped make sense of it all, and through models, the researchers were able to estimate who was living in those forests—barred owls or spotted owls—and approximately how many of them there were.
"The key finding is that barred owls occupied about 8 percent of the northern Sierra Nevada landscape in 2017. But that jumps to 21 percent in 2018. So that's a 2.6-fold increase in just one year. On one hand, that's really worrying, because it suggests that barred owl population has begun to grow really rapidly and thus poses an immediate threat to California spotted owls. But on the other hand, it's also really exciting. 'Cause thta's means we've caught the problem early and have a chance to do something about it. Most biological invasions aren't fully identified until it's too late."
The results are in the journal The Condor: Ornithological Applications.
Wood and his team advise that it might be necessary to take lethal action: remove the barred owls before they wipe out California spotted owls. Assuming we give a hoot about the spotted owls' survival.
Thanks for listening for Scientific American's 60-second Science. I'm Christopher Intagliata.

参考译文

这里是科学美国人——60秒科学系列，我是克里斯托弗·因塔格里塔~J+ZMb3HDPf[]+;b。
横斑林鸮的叫声非常独特BTJM(fIgtkw18=~R)。
“听起来就像在说‘谁给你做饭？’”
（音频剪辑：横斑林鸮的叫声样本）
威斯康星大学麦迪逊分校的保护生物学家和应用生态学家康纳·伍德说到，他本人恰巧能非常形象地模仿横斑林鸮的叫声k2J!Ee;v7]shL#[。
（音频剪辑：模仿横斑林鸮）
横斑林鸮是美国东部的本土鸟类wYq-=UfrUnn。但在上个世纪，它们飞跃大平原，涌入加拿大，在太平洋西北部安家，现在它们已成为北方斑点鸮的主要威胁=d,feH;TW-5@&w1。
“横斑林鸮体型更大，攻击性也更强g[JNP)IKJX_j2g。因此，横斑林鸮能将北方斑点鸮赶出它们喜欢的筑巢地点;tTcIhai+5mW[TWo[。而且，由于横斑林鸮的食物范围更灵活，因此其在环境中的数量可能会更多*DiX3#m~VG!]hYl]。”
现在，它们正在入侵更南边的内华达山脉，即加州斑点鸮的原生地%92327oY;,Al)50tn*v。
“重要的问题是：那里的横斑林鸮数量有多少，增长速度有多快？”
为了回答这个问题，伍德及其团队在遍布内华达山脉北部2300平方英里的近1000个地点部署了录音机0b!Q_T(R-Z。之后他们听了两年录音，并收集了北方斑点鸮模糊的叫声Y*K~)Q6NO55[+9.m。
（音频剪辑：北方斑点鸮的叫声）
……还有横斑林鸮的模糊叫声*RC;@jNV+Ct*h_。
（音频剪辑：横斑林鸮）
他们总共收集了20万小时的音频6Ct=0zIXDNNxWNU9。
“看着音频不断积累，我们知道我们必须从中找到一些可以理解的东西，这真是令人气馁sKxb%2&XDgLV9e。”
梳理鸮叫录音的算法有助于我们理解这一切，通过模型，研究人员能够估算出生活在森林里的是横斑林鸮还是北方斑点鸮，以及它们的大致数量LIWV;lzB)4)MRJU8]l。
“关键发现是，2017年，横斑林鸮在内华达山脉北部环境中的占有率约为8%37H)#26vXeJEZ8h。但到2018年，这一比例飙升至了21%6D[Gs+w-K=PS&[。仅用一年就增长了2.6倍)|WY~X%cA,W。一方面，这确实令人担忧，因为这表明横斑林鸮开始快速增长，继而会对加州斑点鸮构成直接威胁Y%cf)P7w,.@+KYIjLzyA。但另一方面，这也很令人兴奋afd*.po,2jW&w_。因为这说明我们在早期就发现了问题，有机会采取行动3,92;]-IPC@h_gRoq。大多数生物入侵，在完全确认时都为时已晚Be&!C%@WGO0yqcxzdvr。”
这项研究结果发表在《秃鹰：鸟类学应用》期刊上+;LVeD]&!iS。
伍德及其团队建议，可能有必要采取致命行动：清除横斑林鸮，以避免其消灭加州斑点鸮wF1)p#M&yVlZ。前提是我们在意加州斑点鸮的生存Se24Ga;DVSSeKE|@dgf。
谢谢大家收听科学美国人——60秒科学g5;1Q%ys6dgXsi!)s。我是克里斯托弗·因塔利亚塔t4x2i;Ff~Tv|rM1pMR。

译文为可可英语翻译，未经授权请勿转载！

重点讲解

重点讲解：
1. in total 总共；总计；
In total, 45 per cent of adults in Britain are exposed to tobacco smoke at home.
英国总计有45%的成人在家里遭受到烟草烟雾的侵害21eeg_HzTw!。
2. make sense of 理解；弄懂；
This is to help her to come to terms with her early upbringing and make sense of past experiences.
这旨在帮助她认可自己早先所受的教育，并让她了解自己过去的经历Z^%!4@njJ|OFnh。
3. on (the) one hand...on the other hand... 一方面…（另一方面…）；
On the one hand, if the body doesn't have enough cholesterol, we would not be able to survive. On the other hand, if the body has too much cholesterol, the excess begins to line the arteries.
一方面，如果体内没有足够的胆固醇，我们就无法存活下去M#dV%d[.u@H#B+L。另一方面，如果体内胆固醇过高，多余的胆固醇就会附着在动脉内壁上TwUAACXT2ToG;F3Jpgl。
4. wipe out 摧毁；毁灭；使灭绝；
The disease threatens to wipe out the entire population.
这种疾病有可能毁灭整个种群ub0Z+QIvKal。