Spontaneous triploidy and NOR activity in Eigenmannia sp. (Pisces,Sternopygidae) from the Amazon basin |
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| Authors: | L F De Almeida Toledo F Foresti S De Almeida Toledo Filho |
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| Institution: | (1) Departamento de Biologia, Instituto de Biociências da Universidade de São Paulo, Brasil;(2) Departamento de Morfologia, Instituto Básico de Biologia Médica e Agrícola, Universidade Estadual Paulista  Júlio de Mesquita Filho , Campus de Botucatu, Botucatu, SP, Brasil |
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| Abstract: | The occurrence of a natural triploid among diploid individuals of Eigenmannia sp from the Amazon basin is described. The diploid individuals had 2n=31 and 32 chromosomes, the difference in chromosome number being due to a Robertsonian rearrangement. The triploid individual presented 2n=46 and had two fused acrocentrics. NOR activity was present in the three homologues of triploid and a NOR polymorphism was detected in the triploid and diploids. |
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