Karyotypic studies on two Hoplias malabaricus populations (Characiformes, Erythrinidae) of the 2n=42 group, from the first plateau of the Iguacu river basin (Parana State, Brazil)

Karyotypic studies on two Hoplias malabaricus populations (Characiformes, Erythrinidae) of the 2n=42 group, from the first plateau of the Iguacu river basin (Parana State, Brazil)

Author Lemos, PMM Google Scholar
Fenocchio, A. S. Google Scholar
Bertollo, LAC Autor UNIFESP Google Scholar
Cestari, M. M. Google Scholar
Institution Univ Fed Parana
Univ Nacl Misiones
Universidade Federal de São Paulo (UNIFESP)
Abstract Hoplias malabaricus represent a clear example of a species complex, including several karyotypic forms with chromosome numbers ranging from 2n = 39/40 to 2n = 42, including case's of simple and multiple sex chromosome systems. In this work were cytogenetically analyzed two populations of this species. The samples were obtained at the first plateau of the Iguacu river (Parana State, Brazil). The results show that both populations have the same chromosome number (2n = 42) but one of them appears to be characterized by a sex chromosome system with male heterogamety (XX/XY). A such system was also previously described in H. malabaricus from another Brazilian region. Thus, the presence of this differentiated sex chromosome system in this river basin suggests that it was originated before the geographic isolation of the studied populations. The present data represent an additional support for the proposition that Hoplias malabaricus constitutes a species complex.
Keywords geographic distribution
Hoplias malabaricus fish
karyotypic diversity
Language English
Date 2002-07-01
Published in Caryologia. Florence: Univ Florence Botany Inst, v. 55, n. 3, p. 193-198, 2002.
ISSN 0008-7114 (Sherpa/Romeo, impact factor)
Publisher Univ Florence Botany Inst
Extent 193-198
Origin http://www.caryologia.unifi.it/past_volumes/55_3/Caryologia_55_3_193-198.pdf
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000178961600003
URI http://repositorio.unifesp.br/11600/43255

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