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1 February 2013 Comparative Cytogenetics among Populations of Hollandichthys multifasciatus (Teleostei: Characidae)
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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), 105-109, (1 February 2013).
Received: 18 July 2012; Accepted: 1 September 2012; Published: 1 February 2013

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