アカタテハ属の色彩パターン修飾と分子系統解析(2005年度神奈川大学総合理学研究所協同研究助成論文)

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"We are interested in the evolutionary relationships and speciation processes among butterflies of the genus Vanessa (Lepidoptera, Nymphalidae). We first showed that experimental treatment of pupae with cold shock or tungstate, a protein-tyrosine phosphatase inhibitor, produces a series of unique wing color-pattern modifications in adult butterflies. We found that several Vanessa species can be arranged in a progressive series of the systematic color-pattern differences similar to the tungstate-induced modifications. We then investigated the phylogeny of Vanessa and its related butterflies in reference to DNA sequences of the mitochondrial NADH dehydrogenase subunit 5 gene and cytochrome oxidase subunit I gene that are known to be highly variable even between closely-related species. Seven species that belong to the conventional Vanessa genus were separated into two groups: Five species, V. indica, V. samani, V. dejeanii, V. buana, and V. dilecta, formed an independent clade with strong bootstrap support (""INDICA Group""), excluding V. atalanta and V. tameamea as separate species that formed a separate clade (""ATALANTA Group""). Within the INDICA Group, V. buana and V. dilecta were shown to be sister taxa. They indeed may be considered to be a single species. V. samani, V. dejeanii, V. dilecta, and V. buana were shown to be a sister group of species in relation to V. indica. Thus, the INDICA Group contains five species with various color-patterns including V. samani and V. dejeanii, which occupy opposite ends of the progressive color-pattern series. Similarly, the ATALANTA Group consists of two species, V. atalanta and V. tameamea, whose color-patterns are very different from each other. Thus, our data argue for a speciation model in which Vanessa tends to evolve ""bi-directionally"" to species with large or small orange areas on the forewings beyond phylogenetic constraint and an opportunistic activity of the cold-shock hormone physiologically, but not genetically,""links"" ecological selection and color-pattern development of Vanessa butterflies. This model also supports the notion that the hypothetical molecular pathway sensitive to cold shock or tungstate was involved in the speciation of Vanessa butterflies."
2006-05-25

アカタテハ属の色彩パターン修飾と分子系統解析(2005年度神奈川大学総合理学研究所協同研究助成論文)

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