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1 February 2013 Comparative Cytogenetics among Populations of Hollandichthys multifasciatus (Teleostei: Characidae)
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Abstract

Two populations of Hollandichthys multifasciatus from headwaters of adjacent river coastal basins in Paraná state, southern Brazil, were cytogenetically studied in order to evaluate intraspecific divergences. Both populations presented 2n = 50 chromosomes, divided into 14m 18sm 18st in the sample from Antonina and 14m 20sm 16st for the population from Guaraqueçaba. Analyses of active nucleolar organizer regions (Ag-NORs) and fluorescent in situ hybridization (FISH) with 18S rDNA probes revealed a single metacentric pair bearing marks at proximal positions on the short arms. The location of the 5S rDNA and GC-rich sites showed chromosomal divergence between both populations. Therefore, several population markers were detected, reflecting a population differentiation, possibly driven by the formation of Paranaguá Bay and Serra do Mar mountain range. Since the existence of a species complex in H. multifasciatus has been previously characterized by morphological, molecular, and karyotype population differentiation, this species needs to be taxonomically studied in detail.

© 2013 Zoological Society of Japan
Rafael Ernesto Balen, Rafael Bueno Noleto, Marcelo Ricardo Vicari, Roberto Ferreira Artoni, and Marta Margarete Cestari "Comparative Cytogenetics among Populations of Hollandichthys multifasciatus (Teleostei: Characidae)," Zoological Science 30(2), (1 February 2013). https://doi.org/10.2108/zsj.30.105
Received: 18 July 2012; Accepted: 1 September 2012; Published: 1 February 2013
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