| 引用本文: | 唐泽宇,崔宗梅,陈娅,李翠,臧国琛,刘振强,王海艳.基于线粒体COⅠ基因的团聚牡蛎(Saccostrea malabonensis, Faustino, 1932)遗传多样性研究[J].海洋科学,2025,49(11):16-27. |
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| 基于线粒体COⅠ基因的团聚牡蛎(Saccostrea malabonensis, Faustino, 1932)遗传多样性研究 |
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唐泽宇1,2, 崔宗梅1, 陈娅1, 李翠1, 臧国琛1, 刘振强1,3, 王海艳1
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1.中国科学院海洋研究所海洋生物分类与系统演化实验室, 山东 青岛 266500;2.中国科学院大学, 北京 100049;3.青岛农业大学 海洋科学与工程学院, 山东 青岛 266237
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| 摘要: |
| 团聚牡蛎(Saccostrea malabonensis)广泛分布于西太平洋沿岸,是一种重要的滤食性双壳贝类,具有水体净化和生态支持功能。近年来,该物种在中国沿海的首次记录扩展了其已知的地理分布,但其遗传多样性、种群结构和演化历史仍然缺乏深入研究。本研究通过线粒体基因(COⅠ和16S rRNA)对太平洋海域的中国10个地点,日本3个地点,菲律宾1个地点,孟加拉湾3个地点,加勒比海域5个地点的团聚牡蛎群体进行遗传多样性分析,发现西太平洋海域(中国、日本、菲律宾)的团聚牡蛎没有显著的谱系区分,并且与加勒比群体遗传多样性相似,孟加拉湾群体与西太平洋群体(Fst=0.392 17)以及与加勒比群体(Fst=0.384 54)之间均存在显著的较大遗传差异(P<0.05),并且孟加拉湾群体的遗传多样性较二者更高。单倍型网络图也显示出一定的源流关系,但受孟加拉湾群体样本量的限制,尚无法明确其与西太平洋各群体间的准确源流关系。此外,加勒比群体的遗传结构与西太平洋的其他群体非常类似,且遗传差异较小,表明加勒比群体可能是通过巴拿马运河的国际航运或船舶附着生物无意引入。种群历史动态分析表明,多个西太平洋的团聚牡蛎种群(中国群体、日本群体、菲律宾群体)可能在末次冰期的气候变暖和海平面上升过程中经历了扩张。 |
| 关键词: 团聚牡蛎 线粒体基因 遗传多样性 种群遗传结构 |
| DOI：10.11759/hykx20250407002 |
| 分类号:S917.4 |
| 基金项目:国家自然科学基金(42076092,41906083,41776179);国家重点研发计划(2022YFD2401301,2022FY100304,2023YFD2400800);山东省重点研发计划(2023CXGC010411) |
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| Genetic diversity of Saccostrea malabonensis (Faustino, 1932) based on mitochondrial COⅠ gene |
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TANG Zeyu1,2, CUI Zongmei1, CHEN Ya1, LI Cui1, ZANG Guochen1, LIU Zhenqiang1,3, WANG Haiyan1
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1.Department of Marine Organism Taxonomy & Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266500, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266237, China
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| Abstract: |
| Saccostrea malabonensis is a filter-feeding bivalve widely distributed along the western Pacific coasts, where it plays a key role in water purification and ecosystem functioning. In recent years, the known geographical range of this species has extended beyond its initially recorded locations along the Chinese coast. However, its genetic diversity, population structure, and evolutionary history remain poorly understood. In this study, we examined the genetic diversity of S. malabonensis across the Pacific region using mitochondrial cytochrome oxidase subunit Ⅰ and 16S rRNA genes. Sampling included ten sites in China, three in Japan, one in the Philippines, three in the Bay of Bengal, and five in the Caribbean Sea. The results revealed no significant phylogenetic differentiation among western Pacific populations (China, Japan, and the Philippines), and their genetic diversity was comparable to that of the Caribbean populations. In contrast, the Bay of Bengal populations exhibited substantial genetic divergence from both the western Pacific and Caribbean populations (Fst = 0.392 17 and 0.384 54, respectively; P < 0.05) and harbored higher genetic diversity. Haplotype network analyses suggested possible source–sink relationships among regions; however, limited sampling from the Bay of Bengal prevents clear resolution of the precise historical connections between this region and the western Pacific. Notably, the Caribbean populations displayed a genetic structure closely resembling that of the western Pacific populations, showing only minor differentiation. This pattern suggests a potential introduction pathway through international shipping or hull fouling, possibly via the Panama Canal. Historical demographic analyses further indicated that several western Pacific populations (including those from China, Japan, and the Philippines) may have undergone demographic expansion during post-glacial warming and sea-level rise following the Last Glacial Maximum. |
| Key words: Saccostrea malabonensis mitochondrial genes genetic diversity population genetic structure |
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