Phylogenetic Analysis of Water Striders (Hemiptera : Gerroidea) Based on Partial Sequences of Mitochondrial and Nuclear Ribosomal RNA Genes

概要

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Portions of the mitochondrial 16S rRNA gene (16S rDNA) and nuclear 28S ribosomal RNA gene (28S rDNA) were sequenced using 30 species belonging to the superfamily Gerroidea and two outgroup taxa. Comparison of nucleotide sequences showed that both genes contain highly variable and flanking conserved regions and that it is sometimes difficult to align several portions within variable regions. Pairwise comparisons of the sequences showed that base substitutions were biased toward A-T transversions and C-T transitions in the 16S and 28S rDNA, respectively. Resolution of phylogenetic trees was relatively low when the 16S and 28S rDNA were analyzed separately, whereas it was improved when the two DNA sequences were combined. Bootstrap analyses using combined sequences supported monophylies of many of the taxonomic groupings. However, relationships between the Gerridae and Veliidae and among major clades within these families were not clearly resolved. Because a close adherence among these taxa was indicated by base substitutions in both of the independently evolved mitochondrial and nuclear rDNAs, such a relationship may be due to the evolutionary history of this insect group.
日本昆虫学会の論文
2000-12-25