Produção Nacional
Karyological Evidence for a Cryptic Species of Piranha within Serrasalmus rhombeus (Characidae, Serrasalminae) in the Amazon
2001; American Society of Ichthyologists and Herpetologists; Volume: 2001; Issue: 3 Linguagem: Inglês
10.1643/0045-8511(2001)001[0866
ISSN1938-5110
AutoresCeleste Mutuko Nakayama, Michel Jégu, Jorge Ivan Rebelo Porto, Eliana Feldberg,
Tópico(s)CRISPR and Genetic Engineering
ResumoCytogenetic data obtained for Serrasalmus rhombeus revealed two cytotypes (cytotype 1 and cytotype 2) at four sampling sites. Cytotype 1 consists of 2n = 60, 20M 24SM 6ST 10A and was detected in specimens from Negro River (Anavilhanas Islands), Solimões River (Camaleão Lake), confluence of Negro and Solimões Rivers (Catalão Lake), and Uatumã River. Cytotype 2 consists of 2n = 58, 22M 24SM 2ST 10A and was detected in specimens from Catalão and Camaleão Lakes. In Cytotype 2, the first chromosome pair was almost twice the size of second pair, and the constitutive heterochromatin pattern of each cytotype is distinct. The two cytotypes occurred sympatrically at Catalão and Camaleão Lakes, and no intermediates between the cytotypes were detected, suggesting each cytotype represents a different fish species.
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