“被蝉滋了一身尿，有毒吗？”最新回应

有网友发帖称，上海的蝉多到“蝉灾的程度”，叫得让人耳膜痛，走在树下冷不丁被“蝉尿”滋了一头。据澎湃新闻记者检索发现，“蝉尿如雨”的情况在全国多地都有出现。

Netizens have reported that cicadas in Shanghai appear to be at "plague-level" numbers, with their chirping causing ear discomfort and people being unexpectedly sprayed by "cicada urine" under trees. This phenomenon of "cicada urine raining down" has been observed in multiple regions across China.

cicada /sɪˈkeɪdə/ 蝉

近日，网友发布图片显示，树上有许多蝉。 图源：小红书

网友拍摄的“蝉尿如雨”。网络视频截图

今年夏天的蝉格外多吗？“蝉尿”是什么成分，对人体有影响吗？

7月21日，上海师范大学生物系动物学副教授汤亮在接受采访时表示，蝉的确存在“大年、小年”现象，每年出现的数量会有波动，不同区域的数量分布也不均，有些地方的蝉可能会格外多。但据他观察，他附近的蝉的数量没有特别多，属于正常范围。

"Based on personal observation, Shanghai's cicada population this summer remains within normal range," said Tang Liang, associate professor of zoology at Shanghai Normal University's Department of Biology. He explained that cicada populations fluctuate annually and distribute unevenly across regions, leading to localized surges. However, his own observations indicated no abnormal increase in local cicada density.

“蝉尿如雨”也是正常现象。他解释，蝉的口器为刺吸式，以吸食植物汁液为生。树木汁液中的营养成分比较少，蝉需要不停地吸取，其中的营养成分被吸收后，剩下的水分只能排出，“天气越热，吸食越猛，排出越多。”

The "cicada urine rain" is scientifically normal behavior. Tang clarified that cicadas possess piercing-sucking mouthparts to feed on plant sap. As tree sap contains limited nutrients, cicadas must consume large volumes continuously. After absorbing nutrients, they expel excess water. "Higher temperatures accelerate feeding and consequently increase fluid excretion," he said.

piercing-sucking mouthparts 刺吸式口器

为什么有些地方蝉排出的滴液量非常大？汤亮解释，这和蝉的种类有关。他注意到，网友拍摄的“蝉尿如雨”视频中的蝉是黑蚱蝉，这种蝉本身个头大，而且喜欢集群，一棵树上会聚集很多雌雄个体，因此会有大量水珠滋出。

Regarding the substantial fluid volume in certain areas, Tang attributed this to the cicada species variation. He identified the cicadas in viral "urine rain" videos as Cryptotympana atrata—a larger species that aggregates densely on single trees with both males and females present, resulting in concentrated fluid excretion.

被“蝉尿”滋在身上自然有些糟心，但不必担心。汤亮表示，蝉的“尿液”主要成分是水，还有微量的糖，对人体没有影响，其他昆虫也不感兴趣。

While being sprayed is unpleasant, Tang reassured the public that cicada "urine" consists primarily of water with trace sugars, posing no health risks and attracting no interest from other insects.

雄蝉通过持续的鸣叫吸引雌蝉交配，但高分贝的声音有时难免聒噪。汤亮表示：“希望居民朋友多体谅，蝉的成虫寿命很短，比如黑蚱蝉只有十几、二十几天的寿命。大家能听到蝉鸣主要在6月末到7月，8月就少了，9月已经很罕见。”

来源：澎湃新闻

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