Karyotypes and Ag-NOR Variations in Japanese Vespertilionid Bats (Mammalia : Chiroptera)

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The karyological relationships among 14 species of Japanese vespertilionid bats were investigated paying attention to the chromosomal location and frequency of Ag-NORs. The karyotypes of these bats could be classified into two groups : centromere-cap NOR (cmcNOR) and interstitial NOR (intNOR) lineages. The former contained Myotis, Barbastella, Plecotus and Murina, and the latter Pipistrellus, Nyctalus, Vespertilio and Miniopterus. In the former lineage Ag-NORs were all tiny in size and distributed to many acrocentrics. In contrast, those of the latter were comparatively massive in size and shared by only two pairs at the most. While cmcNORs showed in general intergeneric and inter specific variations as well as intraspecific variations in their distribution pattern, intNORs showed rather stable patterns of distribution even among genera. Detailed G- and NOR-banding analyses suggested that most of the NOR-carrylng acrocentrics of the ancestral karyotype might have been involved in Robertsonian rearrangements in the course of karyotype evolution in the Vespertilionidae : cmcNORs may have been transferred to other acrocentrics through cytologic events such as NOR-associations and interchromosomal chromatid exchanges and/or have been deleted through a centric fusion process. The present findings on the type and distribution of Ag-NORs were essentially consistent, except for a certain extent of variations in the location of cmcNORs, with those in the European vespertilionid bats previously reported by Volleth in 1985, and reinforced the karyological dendrogram of Japanese vespertilionid bats proposed by Harada in 1988. Thus, Ag-NORs may also provide useful cytogenetic parameters, at least in the Vespertilionidae, for the determination of phylogenetic relationships.
社団法人日本動物学会の論文
1994-06-15

Karyotypes and Ag-NOR Variations in Japanese Vespertilionid Bats (Mammalia : Chiroptera)

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