Unexpected chromosomal alterations in Tayassu tajacu (Artiodactyla: Tayassuidae) in captivity Alterações cromossômicas inesperadas em Tayassu tajacu (Artiodactyla: tayassuidae) de cativeiros

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1 1- Departamento de Genetica, CB-UFPR, Curitiba - PR 2- CNPq/RD, Plano Sul 3- CNPq/IC, Plano Sul 4- CNPq/AT, Plano Sul 5- Departamento de Genetica, IB-UFRGS, Porto Alegre - RS Abstract Wild animals have been used as bioindicators in situations in which the environment was exposed to chemical agents. In general, chemical agents may induce chromosomal aberrations, such as breaks and gaps. The peccary, Tayassu tajacu is a pig relative that exhibits a very stable karyotype with the only described alterations being of the form of the X chromosome. Chromosomal gaps and breaks were observed at high frequencies during cytogenetics analyses. These alterations were observed in the chromosomes autossomics. Reviews of the literature and of the data described herein suggests that an vermifuge, the ivermectin base, was the most likely cause of these chromosomal alterations. Key-words: Tayassu. Karyotype. Chromosome. Chromosomal alterations.

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