| 摘要: |
| 运用几何形态测量学方法研究浙江省大陈岛海域常见的4种滨螺间的形态关系。对4种滨螺的壳口、螺体分别进行数字化标点，经叠印分析、主成分分析（PCA）和薄片样条法分析，获得4种滨螺在壳口和螺体上的差异，并进一步分析其形态特征与潮间带环境适应性关系。PCA结果表明四种滨螺壳口间差异在主成分轴上无法有效分开，而螺体间差异在主成分轴上能有效分开，说明壳口特征在不同滨螺间不具有规律性差异。螺体的PCA中PC1轴可以将短滨螺与其他3种滨螺区分，薄片样条法分析显示差异的部位主要在体螺层的宽度和螺体的高度间，PC2轴可以将粒结节滨螺与其他3种滨螺分开，薄片样条法分析显示差异部位主要是体螺层之上第一层以及体螺层之间。基于螺体特征的4种滨螺亲缘关系分析表明粗糙滨螺与塔结节滨螺亲缘关系最近，其次为短滨螺，粒结节滨螺最不相近。运用特征追踪法对螺层和螺肋特征追踪，结果表明螺层6层，螺肋密生是滨螺的祖先特征，后来演化出7层和8层的螺层特征以及颗粒状突起的螺肋特征。 |
| 关键词: 滨螺 壳口 螺体 几何形态测量学 主成分分析 系统发生 |
| DOI：10.11693/hyhz20171100293 |
| 分类号: |
| 基金项目:国家自然科学基金项目，31402006号。 |
附件 |
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| A GEOMETRIC-MORPHOMETRY-BASED STUDY ON PHYLOGENY OF FOUR LITTORINA (GASTROPODA: LITTORINIDAE) SPECIES |
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CHEN Nan-Hua1, LIANG Ren-Jie1, BAI Yi1,2, WANG Hai-Rui3
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1.Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou 318000, China;2.Institute of Ecology, Taizhou University, Taizhou 318000, China;3.Sports Science Insititute, TaizhouUniversity, Taizhou 318000, China
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| Abstract: |
| In geometric morphometrics, we studied the shape variation of four species of Littorina (Gastropoda:Littorinidae) species of Dachen Island, Zhejiang, East China. The body whorl and aperture of Littorina were digitized at key landmarks. Methods of Procrustes analysis, principal component analysis (PCA), and thin-plate splines analysis were used to process the data and get the shape difference in body whorl and aperture of the four species. In addition, the relationship between morphological difference and environmental adaptability of the intertidal zone was revealed. As indicated in PCA and thin-plate splines analyses, the apertures of these Littorina showed no significant difference in statistics, but the body whorl. In particular, L. brevicula differed from other three species in body whorl width and height; and N. exigua distinguished itself in the sixth spiral whorl (LM6 and LM9) and body whorl. In phylogeny on the body whorl data of the four Littorina species, L. scabra was most closely related to N. pyramidalis, then to L. brevicula, and finally N. exigua. The ancestral tracking shows that the 6-layered spiral whorls and thinner ribs are the ancestor traits of Littorina, from which 7-and 8-layered spiral whorls evolved, as well as the coarse ribs and sharped ribs on the shell surface. |
| Key words: Littorina aperture body whorl geometric morphometrics principal component analysis Phylogeny |
