Chromosome Relationships between Anostomidae and Chilodontidae Fish (Characiformes).
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概要
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Although many chromosome studies have been conduced in Anostomidae, the data are still concentrated in some genera. Other Characiformes families, such as Chilodontidae, are still cytogenetically unknown. In order to contribute to the cytogenetical knowledge on Anostomidae and Chilodontidae, the mitotic chromosomes of 3 anostomid species, <I>Abramites solarii, Anostomus ternetzi</I> and <I>Pseudanos trimaculatus</I>, and 2 chilodontids, <I>Caenotropus labirynthicus</I> and <I>Chilodus punctatus</I>, were analyzed using Giemsa staining, C-banding and nucleolus organizer region distribution detected by silver nitrate (Ag-NOR) and mithramycin (MM) staining. Although 54 biarmed chromosomes and 1 chromosome pair bearing NOR sites represent a general trait, heterochromatin distribution and NOR chromosome pair position are variable among Anostomidae and Chilodontidae species. This trend suggests that cryptic changes along the chromosome complement of these fishes have occurred, even thought the gross karyotype structure has been strongly conserved during their chromosome evolution. Furthermore, it appears to have a parallelism between morphological/ecological diversity and chromosomal evolution rate among anostomids and chilodontids.
- 財団法人 日本メンデル協会の論文
財団法人 日本メンデル協会 | 論文
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