第96期：寂静中的轰鸣：我们制造了声音，森林停止了生长

我们进入人类世的喧嚣，已经成了鸟类的“沉默危机”。从工业革命起，人源噪音（交通占43%、城市占24%）重塑了自然声景。有科学家在新墨西哥州的实验显示：噪音区鸟类物种减少了三分之一，但留下的黑颏北蜂鸟反而因为天敌西丛鸦撤离，繁殖成功率上升了。
噪音像筛子一样，选出了不同的受众，重组生态。为了应对噪音，鸟类就只能各显神通了，或者是提高音量，但是可能增加被捕食风险；或者是改变频率，大山雀将鸣叫频率从低频调至高频，避开汽车噪音；在澳大利亚的灰胸绣眼鸟甚至演化出基因层面的叫声改变；还有的鸟干脆提前黎明合唱躲开早高峰。
噪音还会引发连锁反应：西丛鸦避噪致单叶松种子传播中断，幼苗数量骤降76%；而蜂鸟增多让红花授粉率提升5倍，生态失衡显现。中国研究更发现噪音与光污染协同，导致鸟类繁殖周期紊乱。
值得庆幸的是，解决方案已在实践：欧盟划定自然“安静区”；江湛铁路建成全球首例高铁全封闭声屏障，用吸声板和橡胶减震，让鹭鸟栖息地噪音控制在50分贝以下，雀鸟反而增加了几千只。保护鸟鸣，就是守护我们自身的心理健康和生态未来。
怕闹腾的西丛鸦
重金属爱好者 - 家朱雀
硬核摇滚乐迷 - 黑颏北蜂鸟
参考文献：
* Noise Pollution Changes Avian Communities and Species Interactions | DOI：10.1016/j.cub.2009.06.052
* Trait-mediated effects of anthropogenic noise on bird behaviour and fitness | DOI：10.1098/rspb.2025.2521
* Effects of nature experience on mental well-being and physiological stress parameters in an experimental bird walk setting -the role of bird song | DOI:10.1016/j.landurbplan.2025.105456
* Exploring the relationship between bird diversity and anxiety and mood disorder hospitalisation rates | DOI:10.1002/geo2.127
* What is the evidence for the impacts of airborne anthropogenic noise on wildlife? A systematic map update | DOI10.1186/s13750-025-00368-3
* Noise pollution alters ecological services: enhanced pollination and disrupted seed dispersal | DOI:10.1098/rspb.2012.0230
* Long-term noise pollution affects seedling recruitment and community composition, with negative effects persisting after removal | DOI:10.1098/rspb.2020.2906
* Strategies of song adaptation to urban noise in the house finch: Syllable pitch plasticity or differential syllable use? | DOI:10.1163/156853909X423104
* Impact of noise pollution on avian behaviour | DOI:10.22271/j.ento.2025.v13.i5b.9612
* Policy Brief: Preventing the harmful effects of anthropogenic noise on biodiversity | produced as part of the Horizon Europe PLAN-B project (Grant Agreement No. 101135308) in collaboration with its sister project AquaPLAN (Grant Agreement No. 101135471).
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背景音乐：光 - 艾热孜巴