Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/18376
Título: Mechanisms of chromosomal evolution and its possible relation to natural history characteristics in Ancistrus catfishes (Siluriformes: Loricariidae)
Autor: Oliveira, Renildo Ribeiro de
Feldberg, Eliana
Anjos, Maeda Batista dos
Zuanon, Jansen
Palavras-chave: Animals
Catfish
Classification
Diploidy
Female
Genetics
Histology
Karyotyping
Male
Evolution, Molecular
Sex Chromosome
Animal
Catfishes
Diploidy
Evolution, Molecular
Female
Karyotyping
Male
Sex Chromosomes
Ancistrus
Loricariidae
Pisces
Siluriformes
Data do documento: 2009
Revista: Journal of Fish Biology
É parte de: Volume 75, Número 9, Pags. 2209-2225
Abstract: Ancistrus is the most speciose genus of the tribe Ancistrini, with 58 valid species and many yet to be described. Cytogenetic studies were conducted on five apparently undescribed species from the Amazon basin, which showed different diploid numbers: Ancistrus sp. Purus (2n = 34); Ancistrus sp. Macoari (2n = 46); Ancistrus sp. Dimona (2n = 52); Ancistrus sp. Vermelho (2n = 42) and Ancistrus sp. Trombetas (2n = 38). All species possessed only one pair of NOR-carrying chromosomes, but with extensive variation in both the location on the chromosome as well as in the position of the ribosomal sites on the karyotype. The karyotypic evolution of Ancistrus species seems to be based on chromosomal rearrangements, with a tendency to a reduction of the diploid number. Two new instances of XX/XY sex chromosomes for Ancistrus species, based on the heteromorphism in the male karyotype, were also recorded. The large karyotypic diversity among Ancistrus species may be related to biological and behavioural characteristics of these fish that include microhabitat preferences, territoriality and specialized reproductive tactics. These characteristics may lead to a fast rate of fixation of chromosomal mutations and eventually speciation across the basin. © 2009 The Fisheries Society of the British Isles.
DOI: 10.1111/j.1095-8649.2009.02450.x
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