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Start Over Author "Ana Claudia Swarça" Journal brazilian journal of biology = revista brasleira de biologia
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1. Structural chromosome polymorphism in a Pimelodus maculatus La Cepède, 1803 population (Siluriformes, Pimelodidae) from the Paranapanema River basin, PR, Brazil

Author

Mazzuchelli J, Ana Lúcia Dias, and Ana Claudia Swarça

Subjects
Male, Population, Drainage basin, Zoology, Biology, Pimelodidae, Polymorphism (computer science), Pimelodus, Animals, education, Genetics, education.field_of_study, geography, geography.geographical_feature_category, Pimelodus maculatus, Polymorphism, Genetic, Fishes, Chromosome, Chromosome Mapping, Karyotype, biology.organism_classification, Karyotyping, Cytogenetic Analysis, Female, General Agricultural and Biological Sciences, Brazil
Abstract

In the present cytogenetic study of Pimelodus maculatus, 13 specimens (8 males and 5 females) from the Congonhas Stream in Paraná State, Brazil, were examined using conventional staining. All of them showed a karyotype of 2n = 56, with a chromosome distribution of 20m + 20sm + 10st + 6a. However, four individuals (2 males and 2 females) were found to have a variant karyotype (cytotype) with two heteromorphic chromosomes in the group of submetacentric chromosomes - one of them corresponds to the second largest chromosome of this group and the other is a chromosome of small size. This variation suggests the existence of a structural polymorphism in the studied population.

Published
2005

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