Evolutionary trends in Hoplerythrinus unitaeniatus (Agassiz 1829) (Characiformes, Erythrinidae)

Evolutionary trends in Hoplerythrinus unitaeniatus (Agassiz 1829) (Characiformes, Erythrinidae) Hoplerythrinus unitaeniatus is a species of economic importance, widely distributed in the Brazilian territory. Many studies have reported the karyotypic variation that occurs in the species, which forms two groups according to the diploid number, one with 2n = 52 and the other with 2n = 48. In this work, three populations of H. unitaeniatus from different hydrographic basins were cytogenetically analyzed. The diploid number found was 2n = 48 for all populations, however, differences in karyotypic formula and fundamental number and heterochromatin distribution were also observed. Ag-NORs were multiple, GC-rich and when applied FISH with 18S rDNA bright signals in six chromosomes were observed. Data from this study confirm the occurrence of interpopulation variability in H. unitaeniatus. The basal number and the possible divergence among the different cytotypes analyzed for this species to date, as well as the forward the proposal of biogeographic and tectonic history for the continental margin are discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Reviews in Fish Biology and Fisheries Springer Journals

Evolutionary trends in Hoplerythrinus unitaeniatus (Agassiz 1829) (Characiformes, Erythrinidae)

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Publisher
Springer Netherlands
Copyright
Copyright © 2011 by Springer Science+Business Media B.V.
Subject
Life Sciences; Freshwater & Marine Ecology; Zoology
ISSN
0960-3166
eISSN
1573-5184
D.O.I.
10.1007/s11160-011-9237-3
Publisher site
See Article on Publisher Site

Abstract

Hoplerythrinus unitaeniatus is a species of economic importance, widely distributed in the Brazilian territory. Many studies have reported the karyotypic variation that occurs in the species, which forms two groups according to the diploid number, one with 2n = 52 and the other with 2n = 48. In this work, three populations of H. unitaeniatus from different hydrographic basins were cytogenetically analyzed. The diploid number found was 2n = 48 for all populations, however, differences in karyotypic formula and fundamental number and heterochromatin distribution were also observed. Ag-NORs were multiple, GC-rich and when applied FISH with 18S rDNA bright signals in six chromosomes were observed. Data from this study confirm the occurrence of interpopulation variability in H. unitaeniatus. The basal number and the possible divergence among the different cytotypes analyzed for this species to date, as well as the forward the proposal of biogeographic and tectonic history for the continental margin are discussed.

Journal

Reviews in Fish Biology and FisheriesSpringer Journals

Published: Oct 5, 2011

References

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