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- Title
Diversified chromosomal characteristics in Centropyge fishes (Pomacanthidae, Perciformes).
- Authors
Takai, Akinori; Izutsu, Hiroyuki
- Abstract
We studied karyotypes and other chromosomal markers such as C-banded heterochromatin and Ag-stained nucleolus organizer regions (Ag-NORs), in seven Centropyge fishes (Pomacanthidae, Perciformes). These results revealed diversified chromosomal characteristics in Centropyge species. Three species had 2n = 48 chromosomes, whereas four species had 2 n = 52 chromosomes. Fundamental numbers showed a large variation from 48 to 82, particularly in the species with 2 n = 52 chromosomes. In all the species, Ag-NORs were located in a single chromosome pair and C-bands were mainly distributed in the centromeric regions of most chromosomes, as commonly seen in teleostean fishes. However, these chromosomal markers showed species-specific variations and provided us with useful information that could help us in understanding chromosomal evolution. On the basis of these chromosomal characteristics, we infer the process of chromosomal evolution, which according to us involves an increase in chromosome number from 2 n = 48 to 2 n = 52 through centric fission or other mechanisms, and in fundamental number through pericentric inversion. In particular, karyotypic evolution involving the increase in chromosome number is an unusual event in the evolution of higher teleostean groups.
- Subjects
JAPAN; FISH genetics; KARYOTYPES; CHROMOSOME banding; CENTROPYGE; MARINE angelfishes; PERCIFORMES; CHROMOSOMES; CENTROMERE
- Publication
Hydrobiologia, 2008, Vol 603, Issue 1, p15
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-007-9242-7