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Cytogenetic analysis of thrush (Turdus, Muscicapidae) species

Miriam Luz Giannoni^I; Iris Ferrari^II ; Marcos Antonio Giannoni^I

^IDepartamento de Melhoramento Genético Animal, Faculdade de Ciências Agrárias e Veterinárias, UNESP, 14870 Jaboticabal, SP, Brasil. Send correspondence to M.L.G.
^IIDepartamento de Medicina Especializada, Faculdade de Ciências da Saúde, Universidade de Brasília, 70910 Brasília, DF, Brasil

ABSTRACT

A cytogenetic study was conducted on four Turdus species from the state of São Paulo: T. leucomelas (Tle), T. rufiventris (Tru), T. aniaurochalinus (Tam) and T. albicollis (Tal), and on one from North America: T. niigratorius (Tmi). Bone marrow metaphase preparations were obtained and the chromosomes were measured and classified by standard methods.
Two karyotypic groups, denoted type I and type II, were detected. The first includes the 3 Brazilian species (Tam, Tru and Tal) and the North American species (Tmi), and the second, only theTle species, which differed from the others mainly in terms of one macroautosome which is telocentric and classified as no. 6 in the type I karyotype, and submetacentric and classified as number 4 in the type II karyotype. The remaining macroautosomes are of similar morphology and size in all species studied. The chromosome number was 2n = 78 in Tal and Tru and 2n = 80 in the other species. The sex pair consists of a metacentric Z, the 4th in size in Tmi, Tam and Tle, and the 3rd in Tru, and a submetacentric W, the 8th in size in Tmi, Tam, Tru and Tie and the 7th in Tal.
By comparing these results with those obtained for two European species of Turdus, T. pilaris (Tri) and T. merula (Tme), it can be seen that Tri belongs to type I and Tme to type II. Literature data indicate that type II is more frequent for the genus Turdus.

Keywords: Cytogenetic; Thrush; Turdus.

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