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    當前位置 > 首頁 > 新聞動態 > 媒體關注
    《新華社》研究發現:歐亞、北美大陸之間存在不對稱量級的生物擴散
    更新日期: 2019-03-24 作者: 文章來源:
    打印 文本大小:    

     新華社成都3月22日電(吳曉穎、張軼佳)遍布北美的美洲黑熊并非“土著居民”,而是在約350萬年前的全球冰期,美洲黑熊的祖先通過結冰的白令海峽從亞洲遷徙來的。我國科學家近期研究發現,在類似北美、歐亞兩大陸之間的物種擴散事件中,歐亞大陸向北美大陸的擴散事件明顯多于北美大陸向歐亞大陸的擴散事件。 

     這一研究成果近日發表在《國家科學評論》上,該刊物是我國第一份英文版自然科學綜述性學術期刊。 

     中國科學院成都生物研究所李家堂團隊采用分子系統發育和生物地理數據,通過數據模擬,整合了92次物種擴散事件,其中包括5次哺乳動物、16次兩棲爬行動物、9次無脊椎動物、5次真菌和57次植物。通過數據對比發現,北美大陸向歐亞大陸的擴散事件(31次)明顯少于歐亞大陸向北美大陸的擴散事件(61次),兩大陸之間存在長時間不對稱量級的生物擴散。 

     為什么會形成這種不對稱量級的生物擴散?李家堂團隊通過分析這些物種擴散事件的歷史,發現擴散事件在時間線上的動態模式與氣候環境變化具有很強相關性。 

     據介紹,幾千萬年前,歐亞大陸和北美大陸之間有一條可以跨越白令海峽的通道,被稱為白令陸橋。約6500萬年前,白堊紀末期導致恐龍滅絕的動蕩寒冷氣候結束后,全球氣候逐漸回暖,白令陸橋區域也形成溫暖潮濕的環境,兩側大陸間的擴散事件都在逐漸增多。大約3500萬年前,發生了一次冰期降溫事件,歐亞大陸物種通過白令陸橋向北美大陸的擴散增速明顯減緩;北美大陸向歐亞大陸的擴散事件明顯減少。隨著氣候回暖,兩側擴散事件又有所回升。大約2500萬年前,降溫事件致使白令陸橋兩側的擴散事件都逐漸減少。 

     李家堂團隊通過研究進一步發現,這一系列氣候變化最終導致北美大陸向歐亞大陸的擴散事件明顯少于歐亞大陸向北美大陸的擴散事件,進而造成兩大陸之間存在不對稱量級的生物擴散現象。(完) 

     原文鏈接


    電話:028-82890289   傳真:028-82890288   Email:swsb@cib.ac.cn
    郵政編碼:610041   地址:中國四川省成都市人民南路四段九號
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