%0 Journal Article
%T Karyotypical diversity of the red piranha (Pygocentrus nattereri) (Characiformes, Characidae), Salobo river, Araguaia basin, Par¨¢, Brazil Diversidade cariot¨ªpica de piranha vermelha (¡°Pygocentrus nattereri¡±) (Characiformes, Characidae), rio Salobo, bacia do Araguaia, Par¨¢, Brasil. DOI: 10.7902/ecb.v2i1.32
%A Mariana Passos Santana
%A Patr¨ªcia Giongo
%A Nat¨¢lia Martins Travenzoli
%A Nicholas Jacob Walker
%J Evolu£¿£¿o e Conserva£¿£¿o da Biodiversidade
%D 2011
%I Universidade Federal de Vi?osa, Campus de Rio Parana¨ªba
%R 10.7902/ecb.v2i1.32
%X Serrasalmideos are fish commonly known as pacus and piranhas, and include around 80 species and 15 generas. The generas are represented in the Amazon, Paran¨¢-Paraguay and S o Francisco basins. The objective of this work was to perform Karyotypical analyses and define the locations of the NOR sites in specimens of red piranhas (Pygocentrus nattereri). Ten individuals of P. nattereri were collected in the Salobo River, Araguaia basin, in Rio Maria municipality, Par¨¢, Brazil. Kidney cells were extracted from each specimen to obtain chromosomes in mitotic metaphases, and stained with silver nitrate to observe the NORs. The recorded photograph was made using an Olympus BX60 microscope, the photos were processed in Adobe Photoshop CS2 and the metaphases were mounted in Image-Pro Plus . The specimens presented a 2n=60 diploid number and the chromosomal formula was 14m+22sm+14st+10a, with NF=100. The results of the NOR karyotypes are within the variation expected for this family, genus and species. Serrasalmideos s o peixes conhecidos por pacus e piranhas, incluindo cerca de 80 esp¨¦cies e 15 g¨ºneros. Os g¨ºneros est o representados na bacia Amaz nica, Paran¨¢-Paraguia e S o Francisco. O objetivo deste trabalho foi realizar an¨¢lises cariot¨ªpicas e definir a localiza  o dos s¨ªtios de NORs, em esp¨¦cimes de piranha vermelha Pygocentrus nattereri. Foram analisados dez indiv¨ªduos de P. nattereri coletados no rio Salobo, bacia do Araguaia, no munic¨ªpio de Rio Maria, Par¨¢-Brasil. Os esp¨¦cimes foram submetidos ¨¤s t¨¦cnicas de obten  o de cromossomos mit¨®ticos metaf¨¢sicos a partir de c¨¦lulas do rim anterior e as NORs obtidas pela impregna  o com nitrato de prata. O registro fotogr¨¢fico feito em microsc¨®pio Olympus BX60, as fotos processadas em Adobe Photoshop CS2 e as met¨¢fases montadas no Image-Pro Plus . Os esp¨¦cimes apresentaram 2n=60 e a f¨®rmula cromoss mica 14m+22sm+14st+10a, com NF=100. Os resultados cariot¨ªpicos e de NORs m¨²ltiplas est o dentro da varia  o esperada para a fam¨ªlia, g¨ºnero e esp¨¦cies.
%U http://simposiodabiodiversidade.com.br/ecb/ecbjournal/index.php/ecb/article/view/32