Cytogenetic study in natural hybrids of Callithrix (Callitrichidae: Primates) in the Atlantic forest of the state of Rio de Janeiro, Brazil

Iheringia. Série Zoologia

Denise M. Nogueira¹  Ana Maria R. Ferreira²  Beatriz Goldschmidt²  Alcides Pissinatti²  Juliane B. Carelli²  Carlos E. Verona² 

[1] ,Universidade Federal Rural do Rio de Janeiro Instituto de Biologia Departamento de GenéticaSeropédica RJ ,Brasil

关键词: Marmosets;    Y-chromosome;    karyotype;    hybridization;    Saguis;    cromossomo y;    cariótipo;    híbridicação;   

DOI  :  10.1590/S0073-47212011000200002

来源: SciELO

【 摘 要 】

In the Atlantic forest of Rio de Janeiro, Callithrix aurita (É. Geoffroy in Humboldt, 1812) is a native species vulnerable to extinction and C. jacchus (Linnaeus, 1758) and C. penicillata (É. Geoffroy, 1812) are invasive species. The major threats to the native species are habitat degradation and hybridization, although there are currently no genetic data about natural hybrids available. Previous studies have revealed that species of the Callithrix genus are extremely homogeneous in their karyotypes with the exceptions of the morphology and size of the Y chromosome and its nucleolar organizer region (NOR) banding pattern. Three male marmosets captured in the wild in Guapimirim municipality, Rio de Janeiro, Brazil, considered as possible hybrids between C. aurita and C. jacchus or C. penicillata on the basis of pelage pattern, were cytogenetically studied. Metaphase chromosomes were obtained by using short-term lymphocyte cultures and Ag-NOR staining was performed. The hybrids karyotypes were 2n=46, 14 uni- and 30 bi-armed autosomes, a median size submetacentric X and NOR bearing autosomes, being compatible with that observed for the genus. In the three individuals studied, Y chromosomes were similar to those found for C. aurita, without NORs. The data obtained suggest the involvement of C. aurita in natural hybridization with one of the invasive species. We discuss the possible consequences of this hybridization.

【 授权许可】

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