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外媒:封印数十万年,古老“黑天鹅”病原体苏醒在即
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参考消息网8月11日报道据美国趣味科学网站8月2日报道,来自永久冻土的“黑天鹅”病原体可能即将苏醒。
报道称,一项研究发现,随着气候变化的影响显现,已经被永久冻土封存了数十万年的古老病原体将开始复苏,其中约1%的病原体可能对现代生态系统构成严重威胁。
芬兰赫尔辛基大学生态数据科学教授、该研究论文的作者之一乔瓦尼·斯特罗纳对趣味科学网站的记者说:“这是科学家第一次尝试从定量角度,对这些穿越时空入侵者的潜在生态学影响进行建模研究。”
永久冻土是通过冰结合在一起的土壤、砾石和沙子的混合物。在北极一些地区(包括阿拉斯加、格陵兰岛、俄罗斯、北欧和东欧的部分地区),地表上下都有永久冻土。永久冻土形成时,细菌和病毒等微生物可能被困在其中,并可能以蛰伏状态存活数千年、甚至数百万年。气候变暖可能重启代谢过程,使这些休眠的微生物被重新激活,并开始繁殖。
在全球变暖的背景下,随着永久冻土融化,其中一些微生物(包括那些可能引发疾病的微生物)将得到释放。2016年,西伯利亚暴发的炭疽热导致数千头驯鹿死亡,数十人受到影响。科学家将该事件归咎于永久冻土的融化。