Chromosome study in two Aratinga species (A. guarouba and A. acuticaudata) (Psittaciformes)

Abstract

The karyotypes of two species of Psittacidae of the genus Aratinga, Aratinga guarouba and A. acuticaudata were studied for the first time. The metaphases were obtained using a short term culture of feather pulp. These karyotypes are compared with others of the genus and their karyological relationships in the Psittaciformes are discussed<br>Foram estudados pela primeira vez os cariótipos de duas espécies do gênero Aratinga, A. guarouba e A. acuticaudata. As metáfases foram obtidas utilizando-se o método de cultura de curta duração de polpa de penas jovens. Estes cariótipos foram comparados com outros do mesmo gênero. Interpretações cariológicas na ordem Psittaciformes são discutidas

The karyotype of the critically endangered Lear's macaw, Anodorhynchus leari Bonaparte 1856 (Aves, Psittaciformes)

“…The karyotypes of these two Anodorhynchus species are similar to those described for members of the genera Cyanopsitta, Propyrrhura, Aratinga, Pionites, Pionopsitta, Nandayus and Guaruba, distinguished by a conserved metacentric pair 1, pairs 2, 3, 4, 5, 6 varying from submetacentric to subtelocentric, pairs 7 and 8 varying from metacentric to submetacentric, and pairs 9, 10 and 11 varying from metacentric to telocentric (De Lucca, 1984;Van Dongen and De Boer, 1984;De Lucca et al, 1991;Duarte and Giannoni, 1990;Goldschmidt et al, 1997;Lunardi et al, 2003). The maintenance of the diploid number among these genera and the occurrence of variation of the centromeric position of the macrochromosomes suggests that in this group the main evolutionary mechanisms for karyotypic differentiation were inversions and/or translocations (De Lucca et al, 1991).…”

Chromosomal Evidences of Adaptive Convergence in the Tail Morphology of Neotropical Psittacidae (Aves, Psittaciformes).

“…However, both short-tailed species here studied, P leucogaster and P pileata, presented the karyotypic pattern observed for long-tailed species from Ara, Aratinga, Guaruba, Nandayus, Cyanopsitta and Propyhrrura genera (Lucca 1984, Duarte and Giannoni 1990, Lucca et al 1991, Goldschmidt et al 1997 Jr. in press. ).…”

“…Previous studies on behavioral and morphological characters (Smith 1975, Sick 1990, 1997, DNA hybridization and sequencing analyses (Sibley andAlquist 1990, Miyaki et al 1998), strongly suggest that New and Old World Psittacidae evolved independently, supporting the tribe status for the American species (Arini) (Smith 1975). It has been claimed the paleogeographic cenario (Godwanaland fission) to suggest that Neotropical species diverged from an Australasian form in the Cretaceous-Tertiary boundary (Miyaki et al 1998).…”

“…However, despite the external variation presented by the different species, specially regarding to the plumage colorful (Forshaw 1989), the overall morphologic similarity shared among species contribute for making difficult further subdivisions. Convergences were detected in various morphological characters, such as orbital and auditory regions of the skull, bill, furcula and digestive tract anatomy, which could lead to artificial classifications (Smith 1975, Sick 1990, 1997.…”

Chromosomal Evolution in Psittaciformes. Revisited

“…The monotypic genus Triclaria malachitacea and Aratinga finschi, described in this report, are integrated in this karyological group, where we may include the genera; Anodorhynchus (Lunardi et al, 2003), Ara (Francisco & Galetti J., 2001;Van Dongen & De Boer, 1984), Cyanopsitta (Duarte & Giannoni, 1990), Aratinga (De Lucca, 1974, 1984Goldschmidt et al, 1997;This report), Guarouba (Goldschmidt et al, 1997), Nandayus, (Francisco & Galetti J., 2001), Propyrrhura (Francisco & Galetti J., 2001), Pionites (Francisco, Lunardi, & Galetti Jr., 2001), ijb.ccsenet.org International Journal of Biology Vol. 8, No.…”