近期热映的电影《沙丘》中出现的萌系“跳跳鼠”,它后腿细长、一蹦能跳出老远,身后还拖着条细长尾巴。最萌的是,它有一对大耳朵,不仅能探听风吹草动,耳朵内面还能凝结水分,两只小爪子一抓就能喝到嘴里。
《沙丘》中的“沙漠鼠”穆阿迪布(Muad'Dib)(来源:电影《沙丘》)
“跳跳鼠”的原型是什么?
电影中的厄拉科斯星球上“沙漠鼠”穆阿迪布
(Muad'Dib)
,它的设计灵感其实来自于
现实世界中的长耳跳鼠
(Euchoreutes naso)
。
这是一种小型啮齿类动物,以其出色的适应干旱环境的能力而闻名,主要分布在沙漠和干燥地区。它们的名字来源于它们的跳跃方式和长腿,
这些特征让它们在移动时更像是袋鼠而不是传统意义上的老鼠
。
长耳跳鼠示意图(来源:使用AI生成)
长耳跳鼠真的可以用耳朵收集水吗?
当然不能,在现实世界中,长耳跳鼠几乎不需要直接饮水,它们能从食物中摄取几乎所有必需的水分。
这种能力来自于它们极其高效的肾脏,能够极大限度地减少水分通过尿液的损失。同时,低水损耗,它们的新陈代谢特别适应干旱,产生的尿液浓缩度非常高,粪便也非常干燥,这进一步减少了水分的损失。
长耳跳鼠主要在夜间活动,这有助于避免白天极端的高温,减少水分蒸发。夜间的活动也使它们能够利用稍微凉爽的温度来寻找食物。
它们会收集种子等食物,并将其储存在它们的洞穴中。
不仅为它们提供了在极端条件下的稳定食物来源,还减少了在寻食时对高温的暴露。
长耳跳鼠有极强的适应干旱能力(来源:wikipedia)
这种萌系小动物在沙漠地区特别常见,它们对极端干旱的适应能力使它们成为《沙丘》中这种虚构生物设计的灵感来源。
甲壳虫主动收集沙漠中的水分?
在现实世界中,既然长耳跳鼠的大耳朵不能收集水分,那有没有生物可以主动收集水分呢?
还真有!
在世界上最干旱的地区之一——非洲南部的纳米布沙漠,每年降雨量仅为 1.4 厘米。在这片沙漠中生存者一种甲虫,纳米比沙漠甲虫
(Namib Desert beetle)
,在收集水分方面展示了独特的适应性。
纳米比沙漠甲虫(来源:文献1)
纳米比甲虫的生存策略非常巧妙:它会爬到沙丘上,面对微风,身体保持 45 度角,利用硬质的鞘翅捕捉空气中的水珠。鞘翅表面拥有特殊的结构,能有效收集水分,这么神奇?这就要说一说基于它的
身体表面特殊结构收集水分的原理
。
甲壳虫的头部对准风向,其鞘翅表面的凹凸不平设计帮助捕获雾中的水珠。雾气中的微小水滴,直径约 15~20 微米,会凝聚在其翅膀上。这些水滴首先会粘附在亲水性的凸起部位,凸起部分的周围是疏水的凹槽。
当水珠与亲水表面接触时,它们会扩散开,形成较大的水滴,这样就不易被风吹走,还可以吸附更多的水珠。在每小时 30 公里的风力作用下,水滴会增长到直径 5 毫米,并沿着甲壳虫的背部滑落至口部,供甲壳虫摄取。
纳米比沙漠甲虫背部小水滴随时间变化的示意图(来源:文献3)
这种独特的水分收集方法使纳米比沙漠甲虫能够在几乎没有可见水源的环境中生存。
科学家们还从这种甲虫的水收集机制中获取灵感,发展出了新型的水收集技术
,这些技术可以在干旱地区收集大气中的水分,用于人类和农业的用水需求。
水分收集的仿生应用
科学家们从纳米比沙漠甲虫背部的水收集机制中获得了灵感,设计了多种能够模仿这种自然现象的材料和技术。
东华大学的研究人员首先提出了一种
亲水-超疏水图案化织物
,通过简单的纺织设备和简便的编织方法制成。这种织物采用亲水性粘胶和疏水性丙纶丝与一些试剂生产混合可湿性表面,不仅大大降低了成本,为未来大规模生产集水材料提供了可能。
制备亲水-超疏水图案纬背机织物的示意图(来源:文献4)
澳大利亚工程师 Edward Linacre 受到纳米比沙漠甲虫水收集机制的启发,开发了一种自供能的灌溉泵系统,名为“Airdrop”。这个系统通过地下管道网络将空气引入并冷却至水分凝结的温度,然后将水分输送到植物的根部,旨在为干旱地区的农作物提供灌溉。
NBD Nano 这家美国创业公司研究如何将甲虫的功能模仿到水瓶表面上,创建一种自填充水瓶。这种原型瓶据信能根据当地环境每小时收集 0.5 到 3 升水。
设计师 Arturo Vittori 和 Andrea Vogler 创造的 Warka Water 是一种高 9 米的竹塔,内置塑料网格,在夜间收集湿空气中的水分,并将其储存在底部的水箱中。这种设计能够为干旱地区提供成本低廉的水资源。
水滴会沿着甲虫的背部滑落至口部(来源:文献1)
通过模仿纳米比沙漠甲虫等生物的水收集策略,科学家和工程师们正在为干旱地区提供创新且可持续的解决方案。
这不仅促进了水资源管理的科学发展,也为未来的环境保护和可持续发展开辟了新道路。
我们期待这些灵感来源于自然界的技术能够进一步发展,为全球范围内缺水的地区带来实质性的改变。
参考文献
[1]Parker, Andrew R., and Chris R. Lawrence. "Water capture by a desert beetle." Nature 414.6859 (2001): 33-34.[2]Frederick, Eva. "Could this desert beetle help humans harvest water from thin air?." Science 27 (2019).
[3]Chen, Zhen, and Zengzhi Zhang. "Recent progress in beetle-inspired superhydrophilic-superhydrophobic micropatterned water-collection materials." Water Science and Technology 82.2 (2020): 207-226.
[4]Liu, Qibao, Xiaoyan Li, and Zaisheng Cai. "Facile fabrication of asymmetric wettable fabric with weft backed weave for oil/water separation." RSC advances 6.111 (2016): 109769-109777.
[5]Gao, Yue, et al. "Textile-inspired methodology toward asymmetric fabric based on weft-backed weave for oil/water separation." Journal of materials science 53.6 (2018): 4683-4692.
策划制作
丨Denovo 团队 科普团队
审核丨黄乘明 中国科学院动物研究所 研究员
策划丨丁崝
丨丁崝
审校丨徐来 林林
本文封面图片及文内图片来自版权图库
原来跳跳鼠原型是它!
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