当前位置:首页>林业>MBE:东北林业大学等科研团队基于遗传学和形态学证据发现穿山甲新分类阶元

MBE:东北林业大学等科研团队基于遗传学和形态学证据发现穿山甲新分类阶元

  • 2026-02-02 14:51:53
MBE:东北林业大学等科研团队基于遗传学和形态学证据发现穿山甲新分类阶元

    群岛及大洋岛屿的物种特有性水平极高,该特征与物种的快速形成过程密切相关。马来穿山甲被IUCN列为极度濒危的物种,其分布范围涵盖中国云南南部,并经由马来半岛扩散至太平洋西部岛屿(图1)。该物种分布区具有高度的生态异质性、是全球公认的生物多样性热点区域之一。在这种地理环境下,马来穿山甲种群之间在显著的地理隔离和栖息地破碎化问题,其物种内部可能会出现显著分化。那么马来穿山甲种群中是否存在隐含的未被发现的分类阶元?

1:马来穿山甲全球分布图(来源IUCNhttps://www.iucnredlist.org/species/12763/123584856

2026116东北林业大学科研团队联合国内外多家科研院所,在进化生物学领域主流期刊《Molecular Biology and Evolution》上发表了题为Population genomics reveals deep diversification in Malayan pangolins”的研究论文(https://doi.org/10.1093/molbev/msag016)。该研究基于群体基因组学和头骨形态学,系统评估了马来穿山甲(Manis javanica)种群内部的遗传分化水平,发现了多个遗传分化群体并进一步支持了第九种穿山甲的存在,同时研究还揭示了各个种群遗传多样性水平、近交风险和有害突变水平,为马来穿山甲种群未来的保护提供了重要的科学依据。

    该研究对594只马来穿山甲开展了大规模群体基因组解析,结果揭示其存在3个遗传分化极为显著的种群(MJ1MJ2MJ3):其中MJ3种群规模最大,分布范围从中国大陆延伸至几乎整个东南亚地区;MJ1MJ2种群规模相对较小,分布局限于婆罗洲岛屿及周边(图2)。马来穿山甲的遗传分化模式得到头骨形态学比较结果的支持。此外,结合多维度基因组证据、并首次利用头骨形态学证据(图3),揭示了第五种亚洲穿山甲——神秘穿山甲(M. mysteria)的存在;推测其分布区可能是婆罗洲东北部或其邻近地区。

2:马来亚穿山甲种群的深度分化与地理起源

3:神秘穿山甲(MJoutlier)与马来亚穿山甲头骨比较

遗传多样性是理解物种濒危机制及制定保护策略的重要依据。马来亚穿山甲全基因组水平的期望杂合度存在较大差异,多数处于中等水平(图4),这表明人为干扰尚未显著破坏其遗传存续的物质基础。如果能消除偷猎、非法贸易及栖息地破坏等人为威胁,其种群仍有快速恢复的可能。同时,MJ1种群表现出最高的全基因组近交系数、较低的遗传多样性,以及高比例携带有害突变负荷的纯合个体。该遗传模式表明,MJ1种群可能长期处于隔离状态、有效种群规模较小,这导致了持续的遗传漂变及有害突变的累积。因此,MJ1种群的适应性下降风险可能最高,亟需将其纳入重点保护范畴。

4:马来亚穿山甲种群遗传多样性和近交风险

    东北林业大学徐艳春教授和兰天明教授、广东省林科院华彦研究员以及湖南省生物多样性保护中心李立研究员等为论文共同通讯作者;东北林业大学李波副教授和李海盟副教授、南京中医药大学王情副教授以及中国林科院李惠鑫副研究员等为论文共同第一作者。该研究得到了国家自然科学基金、黑龙江省重点研发以及人才引进启动项目的支持。

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  1. CONNECT:[ UseTime:0.000422s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000625s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000278s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000261s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000487s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000525s ]
  8. SELECT * FROM `article` WHERE `id` = 462218 LIMIT 1 [ RunTime:0.000579s ]
  9. UPDATE `article` SET `lasttime` = 1770941014 WHERE `id` = 462218 [ RunTime:0.003216s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000238s ]
  11. SELECT * FROM `article` WHERE `id` < 462218 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000470s ]
  12. SELECT * FROM `article` WHERE `id` > 462218 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004533s ]
  13. SELECT * FROM `article` WHERE `id` < 462218 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001607s ]
  14. SELECT * FROM `article` WHERE `id` < 462218 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001900s ]
  15. SELECT * FROM `article` WHERE `id` < 462218 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002387s ]
0.089415s