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Intrapopulation Chromosomal Polymorphism in Mazama gouazoubira (Cetartiodactyla; Cervidae The Emergence of a New Species?

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Autor(es):
Valeri, Mirela P. [1] ; Tomazella, Iara M. [1] ; Duarte, Jose M. B. [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista UNESP, Fac Ciencias Agr & Vet, Dept Zootecnia, Nucleo Pesquisa & Conservacao Cervideos NUPECCE, Jaboticabal - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Cytogenetic and Genome Research; v. 154, n. 3, p. 147-152, 2018.
Citações Web of Science: 1
Resumo

Mazama gouazoubira is a small deer species widely distributed in South America. Previous studies have shown that this species presents intraspecific chromosomal polymorphisms, which could affect fertility due to the effects of chromosomal rearrangements on gamete formation. Important aspects regarding the karyotype evolution of this species and the genus remain undefined due to the lack of information concerning the causes of this chromosomal variation. Nineteen individuals belonging to the Mazama gouazoubira population located in the Pantanal were cytogenetically evaluated. Among the individuals analyzed, 9 had B chromosomes and 5 carried a heterozygous centric fusion (2n = 69 and FN = 70). In 3 individuals, the fusion occurred between chromosomes X and 16, in 1 individual between chromosomes 7 and 21, and in another individual between chromosomes 4 and 16. These striking polymorphisms could be explained by several hypotheses. One is that the chromosome rearrangements in this species are recent and not fixed in the population yet, and another hypothesis is that they represent a balanced polymorphism and that heterozygotes have an adaptive ad vantage. On the other hand, these polymorphisms may negatively influence fertility and raise questions about sustainability or reproductive isolation of the population. (C) 2018 S. Karger AG, Basel (AU)

Processo FAPESP: 12/21044-3 - Caracterização cariotípica de uma população de Mazama gouazoubira (ARTIODACTYLA; CERVIDAE) do Pantanal da Nhecolândia
Beneficiário:Mirela Pelizaro Valeri
Modalidade de apoio: Bolsas no Brasil - Iniciação Científica