Diversified chromosomal characteristics in Centropyge fishes (Pomacanthidae, Perciformes) |
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Authors: | Akinori Takai Hiroyuki Izutsu |
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Institution: | (1) Department of Human and Environmental Sciences, Osaka Shin-Ai College, 6-2-28 Tsurumi, Tsurumi-ku, Osaka 538-0053, Japan;(2) School of Science, Kwansei Gakuin University, 1-1-155 Uegahara, Nishinomiya 662-8501, Japan |
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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 2n = 52 chromosomes. Fundamental numbers showed a large variation from 48 to 82, particularly in the species with 2n = 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 2n = 48 to 2n = 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.
Handling editor: K. Martens |
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Keywords: | Chromosomal evolution Centric fission C-banded heterochromatin Ag-NORs Pomacanthid fish |
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