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<p>The Fujian oyster (<i>Crassostrea angulata</i>) is an economically significant shellfish species distributed mainly along the Fujian coast, Southeast China. However, its genetic diversity and structure remain unclear. The main distribution area of the <i>C. angulata</i> is located in Fujian, South China. In total, 420 <i>C. angulata</i> were collected from 14 natural habitats (populations) along the Fujian coast, and their genetic diversity and structure were analyzed in the mitochondrial COI and nuclear gene ITS2 sequences. Results reveal that all the 14 populations of <i>C. angulata</i> exhibited high levels of genetic diversity, with a total of 57 (haplotype diversity: 0.811±0.016) and 124 (haplotype diversity: 0.912±0.007) haplotypes revealed by COI and ITS2, respectively. Notably, significant intermediate level of genetic differentiations between the Ningde Zhujiang (ZJ) population (<i>F</i><sub>ST</sub> by COI: 0.035.0.142, <i>P</i>&lt;0.05; <i>F</i><sub>ST</sub> by ITS2: 0.078–0.123, <i>P</i>&lt;0.05) with other populations were observed for the first time, which is also supported by the results of molecular variance analysis (<i>F</i><sub>CT</sub> by COI: 0.105, <i>P</i>&lt;0.05; <i>F</i><sub>CT</sub> by ITS2: 0.086, <i>P</i>&lt;0.05) and the clustering of the ZJ population into distinct branches in the interpopulation genetic differentiation tree. Furthermore, the evolutionary tree and haplotype network analyses do not support the formation of a clear geographical genealogical structure among these 14 populations. In addition, the population dynamics analysis suggests that the <i>C. angulata</i> may have undergone expansion during the third ice age of the Pleistocene. These results provide a reference for the preservation and further genetic improvement of <i>C. angulata</i>.</p>

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Genetic diversity and population structure of the Fujian oyster Crassostrea angulata revealed by mitochondrial COI gene and nuclear gene ITS2 sequences

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Shiqi Yu,
  • Ziqiang Han,
  • Huayong Que

摘要

The Fujian oyster (Crassostrea angulata) is an economically significant shellfish species distributed mainly along the Fujian coast, Southeast China. However, its genetic diversity and structure remain unclear. The main distribution area of the C. angulata is located in Fujian, South China. In total, 420 C. angulata were collected from 14 natural habitats (populations) along the Fujian coast, and their genetic diversity and structure were analyzed in the mitochondrial COI and nuclear gene ITS2 sequences. Results reveal that all the 14 populations of C. angulata exhibited high levels of genetic diversity, with a total of 57 (haplotype diversity: 0.811±0.016) and 124 (haplotype diversity: 0.912±0.007) haplotypes revealed by COI and ITS2, respectively. Notably, significant intermediate level of genetic differentiations between the Ningde Zhujiang (ZJ) population (FST by COI: 0.035.0.142, P<0.05; FST by ITS2: 0.078–0.123, P<0.05) with other populations were observed for the first time, which is also supported by the results of molecular variance analysis (FCT by COI: 0.105, P<0.05; FCT by ITS2: 0.086, P<0.05) and the clustering of the ZJ population into distinct branches in the interpopulation genetic differentiation tree. Furthermore, the evolutionary tree and haplotype network analyses do not support the formation of a clear geographical genealogical structure among these 14 populations. In addition, the population dynamics analysis suggests that the C. angulata may have undergone expansion during the third ice age of the Pleistocene. These results provide a reference for the preservation and further genetic improvement of C. angulata.