Morphological Variation Analysis of Six Geographical Populations of Venus Clam Meretrix meretrix
JING Yuanyuan1,2,3, CHEN Qun1,2,3, LIU Tianhong1, SUN Ming1,2,3, LIU Guangbin1,2,3, HU Fawen1,2,3, WU Haiyi1,2,3, ZHANG Tianwen1,2,3, HU Fanguang1,2,3
1. Marine Science Institute of ShandongProvince, Qingdao 266104, China; 2. Key Laboratory of Mariculture & Enhancement in Shallow Sea Area, Qingdao, Qingdao 266104, China; 3. Shandong Provincial Engineering Technology Research Center for Healthy Breeding in Seawater, Qingdao 266104, China
Abstract：In order to research morphological differences and geographical differentiation characteristics of different geographical populations of venus clam Meretrix meretrix, nine morphological traits were measured, including shell length, shell height, shell width, and ligament length in samples collected from six geographical populations of venus clam in Dongying, Laizhou, and Rizhao in Shandong province and Rudong in Jiangsu province, and Putuo, and Yueqing in Zhejiang province. A comparative analysis was conducted to explore the morphological variation in different geographical populations. The results showed that the venus clam in Putuo population had the maximal shell uplift and the thinnest shell, and that ones in Rizhao population had the thinnest and most flat shell. The cofficient difference(C.D) among six geographical populations was found to be 0.320—1.261, less than 1.28, indicating that the morphological variation was characterized under-subspecies. Four principal components were constructed, with the descending order of contributory ratio as 25.69%, 18.84% , 15.57% and 11.62%, summing up to 71.71%. The cluster analysis revealed that six populations were clustered into two branches, Dongying population and Laizhou population being grouped into one group, and Rudong population, Putuo population, Yueqing population and Rizhao population into one another group. Five discriminant functions of six populations were established, with discriminant accuracy rate from 70.0% to 100.0%, with a total of 82.8%. The findings provided scientific reference with the identification of geographical populations and protection and utilization genetic resources of venus clam.
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2024, Vol. 43 
