Decomposing shell form into size and shape by geometric morphometric methods in two sympatric ecotypes of littorina saxatilis
Decomposing shell form into size and shape by geometric morphometric methods in two sympatric ecotypes of littorina saxatilis
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DOI：
10.1093/mollus/eyi037
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发表时间：
2005-11-01
影响因子：
1.2
通讯作者：
Rolán-Alvarez, E
中科院分区：
文献类型：
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作者：
Carvajal-Rodríguez, A;Conde-Padín, P;Rolán-Alvarez, E
两个同域蜗牛生态型（RB和SU）的石纹玉黍螺从暴露的岩石海岸，西班牙西北部的生活史特征不同，但经典的形态分析未能揭示它们之间显着的壳形差异。我们使用几何形态测量方法的地标数据从数字化的外壳图像，研究大小和形状组件在两个地方的两个生态型。结果表明，在壳的大小和形状（均匀和不均匀的组件）的生态类型之间的显着差异。异速生长也检测到的一些组件的局部变化的形状，虽然它并没有解释观察到的生态型之间的差异。SU生态型具有相对圆的壳形和大的孔径，而RB生态型具有较高的尖顶和较小的孔径。我们认为，形状分化与生态类型之间的适应性差异。
Two sympatric snail ecotypes (RB and SU) of Littorina saxatilis from exposed rocky shores of NW Spain differ in many life history traits, but classical morphometric analysis has failed to reveal significant shell shape differences between them. We used geometric morphometric methods on landmark data from digitized shell images to study size and shape components in both ecotypes at two localities. The results showed significant differences between ecotypes in both shell size and shape (both uniform and non-uniform components). Allometry was also detected for some component of the local variation in shape, although it did not explain the observed differences between ecotypes. The SU ecotype had a relatively rounded shell shape with a big aperture, whereas the RB ecotype had higher spire and smaller aperture. We suggest that shape differentiation is correlated with adaptive differences between ecotypes.