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全球昆虫数目减少 长此以往蝴蝶蜜蜂等恐遭绝迹

2019-02-12 09:27:02   上海热线 

全球昆虫数目减少

全球昆虫数目减少

原标题:全球昆虫数目减少 或将于一个世纪内完全绝种

据香港《文汇报》报道,全球昆虫正面临灭绝危机。报告称,过去30年来,全球昆虫数目持续减少,若长此以往,昆虫将于一个世纪内完全绝种,令自然生态系统出现“灾难性崩溃”。

据报道,研究由澳洲悉尼大学教授桑切斯-巴约,以及中国农业科学院客席教授怀克胡伊斯联合进行,他们综合了历来73篇有关昆虫减少的最佳研究论文,以分析全球昆虫减少概况,当中大部分研究主要针对西欧和美国,部分则涉及澳洲、中国、巴西或南非。

报告称,过去30年内,全球昆虫数目以每年2.5%的幅度持续减少,

如今有超过40%昆虫品种的数量正在下降,约1/3品种更处于濒危状况。长此以往,昆虫恐遭绝迹。

研究发现,全球昆虫的绝种速度是哺乳类动物的8倍,其中蝴蝶、飞蛾及蜜蜂的减幅最大。

桑切斯-巴约指出,昆虫数目锐减令人震惊,警告若按每年2.5%跌幅计算,昆虫数目会在10年后减少1/4,100年后更会完全绝种,又指一旦昆虫绝种,以其为食粮的雀鸟和爬行类也会受到波及。

过往已有研究指出,地球正处于史上第六次生态大灭绝,但大多只集中于较容易研究的大型动物,针对昆虫的则较少,但昆虫是地球上最多样化的物种,对整个生态系统的运作尤为关键。

报告强调全球均面对同样问题,并指出工业化规模的密集式农业、过度使用农药、城市化及全球气候变化都是昆虫数目锐减的元凶。

英国萨塞克斯大学教授古森表示,昆虫可以帮助大部分植物授粉,保持农田健康,并能控制有害植物数目,强调人类无法在缺少昆虫的环境下生存。

责任编辑:周晶晶 CN032
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