| 摘要: |
| 运用多变量形态度量学分析方法，采用 9 项生物学形态性状指标比较了中国橄榄蚶（Estellarca olivacea）3个地理群体间的形态差异。聚类分析和主成分分析结果表明，浙江三门群体和浙江灵昆群体形态较为接近，江苏通州群体的趋异程度较大。主成分分析构建了两个主成分，第一主成分贡献率为47.73%，第二主成分贡献率为13.56%，累计贡献率为61.29%。贝体凸扁、壳厚和前后端形状等形态性状决定了橄榄蚶不同地理群体的形态差异，其形态变异主要与栖息地水温和底质有关。
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| 关键词: 橄榄蚶（Estellarca olivacea） 地理群体 聚类分析 主成分分析 |
| DOI： |
| 分类号: |
| 基金项目:浙江省科技计划项目（2006C32010）；温州市科技计划项目（S2006A002） |
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| Morphological variation in three geographical populations of Estellarca olivacea |
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ZHANG Yong-pu,YING Xue-ping,WANG Tie-gan,CHAI Xue-liang
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| Abstract: |
| Based on nine morphological characters of populations of Estellarca olivacea from Zhejiang Lingkun, Zhejiang Sanmen and Jiangsu Tongzhou, the morphological variations of three geographical populations were studied by means of multivariate morphometrics. The results of cluster analysis and principal component analysis revealed that the morphological characters of E. olivacea from Zhejiang Sanmen population and Zhejiang Lingkun population were similar to each other but were much more different from the character of Jiangsu Tongzhou population. In the principal component analysis, two principal components were constructed. The contributory ratios of the two principal components were 47.73% and 13.56% respectively and the cumulative contributory ratio was 61.29%. The shell protrusion or flat, shell thick and fore-and-aft shape determined the morphological variations of different geographical populations of E. olivacea, which were related with the water temperature and substrate.
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| Key words: Estellarca olivacea geographical population cluster analysis principal component analysis |
