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首页> 外文期刊>Biological Journal of the Linnean Society >Elliptic Fourier analysis of the form of genitalia in two Spodopteraspecies and their hybrids (Lepidoptera : Noctuidae)
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Elliptic Fourier analysis of the form of genitalia in two Spodopteraspecies and their hybrids (Lepidoptera : Noctuidae)

机译：两种斜纹夜蛾属及其杂种的生殖器形式的椭圆傅里叶分析（鳞翅目：夜蛾科）

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摘要

S. latifascia and S. descoinsi are two closely related species of Noctuid moths. In laboratory conditions they hybridize, and Fl, F2 and backcross hybrids may be obtained easily. Some interspecific matings do not succeed due to anatomical incompatibilities resulting from morphological differences in the genitalia of the species. One of these differences involves the clasper, a highly sclerotized process of the male genitalia. The overall contour of the clasper in S. descoinsi, S. latifascia, Fl, F2, and backcross hybrids was analysed using elliptic Fourier analysis. All outlines were rotated along a common direction defined by two homologous landmarks, centered, and normalized for size. Fourier descriptors were used in a canonical variate analysis. Shape variations along factorial axes, or more generally along any variate of interest, such as size, were modelized by a multivariate regressive approach and visualized by inverse Fourier reconstructions of shapes. This approach allows a direct visualization of the shape transformations, negating the so-called impossibility or difficulty to interpret results of Fourier analyses. The results emphasize the specificity of the male clasper in the parental species. Most hybrids and backcrosses segregate from their parents. Many of them are displaced towards one of the parental forms. These results suggest that morphological differences may be controlled by a polygenic system with maternal effect in Fl and parental dominance in backcross hybrids.
机译：S. latifascia和S. descoinsi是夜蛾的两个密切相关的物种。在实验室条件下，它们杂交，并且F1，F2和回交杂种可以容易地获得。由于种外生殖器形态上的差异而导致的解剖学不相容性，某些种间交配未能成功。这些差异之一涉及clasper，即男性生殖器的高度硬化过程。使用椭圆傅里叶分析法分析了德氏链球菌，阔叶链球菌，F1，F2和回交杂种中的clasper的整体轮廓。所有轮廓均沿由两个同源地标定义的公共方向旋转，居中并针对大小进行归一化。在标准变量分析中使用了傅立叶描述符。沿阶乘轴或更普遍地沿任何感兴趣的变量（例如大小）的形状变化通过多元回归方法进行建模，并通过形状的傅立叶逆变换进行可视化。这种方法可以直接可视化形状变换，从而消除了解释傅里叶分析结果的所谓的可能性或难度。结果强调了雄性clasper在亲本物种中的特异性。大多数杂种和回交与父母分离。他们中的许多人流向了父母形式之一。这些结果表明，形态差异可以由具有F1的母本效应和回交杂种中的亲本优势的多基因系统控制。

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