图片来源:美联社
蝗虫压境,带来的不只是令人不寒而栗的气氛,更重要的是,破坏农作物,造成严重的粮食危机。
专家称,这场蝗灾给全球最脆弱的国家造成了前所未有的粮食危机。
…posing an unprecedented threat to food security in some of the world's most vulnerable countries, authorities say.
为何人人谈“蝗”色变?
据悉,这场蝗灾的始作俑者是一种被认定为最危险的蝗虫种类——沙漠蝗虫。
这种全世界最具破坏力的迁徙性害虫,飞行能力强、食量大,可聚集形成巨大蝗群。同时,沙漠蝗虫的成虫寿命很长,最多可以生存100多天。
图片来源:新华社
➤ 繁殖能力强
《科学》杂志在近期的一篇文章中称,2018年5月,热带气旋袭击阿曼、也门和沙特阿拉伯三国之间的沙漠地带。强降雨使植被迅速生长,营养充足的蝗虫得以在6个月内数量增加400倍。
In May 2018, a cyclone hit the desert "empty quarter" of Oman, Yemen, and Saudi Arabia. After the unusual rainfall, vegetation flourished, and the well-fed locusts increased their population 400-fold over 6 months.
沙漠蝗虫的迁徙路线图
据联合国粮农组织预测,蝗灾扩大趋势可能延续到6月,届时蝗群的规模可能是现在的500倍。
➤ 破坏力超强
政府间发展管理局在一份声明中称,一个典型的沙漠蝗群每平方公里可以容纳1.5亿只蝗虫。它们随风飞行,一天可以覆盖100-150公里。一个普通的沙漠蝗群一天可以摧毁足够供给2500人的粮食作物。
"A typical desert locust swarm can contain up to 150 million locusts per square kilometer," it said. "Swarms migrate with the wind and can cover 100 to 150 kilometers in a day. An average swarm can destroy as much food crops in a day as is sufficient to feed 2,500 people."