Occurrence of Akodon cursor (Rodentia, Cricetidae) with 14, 15 and 16 chromosome cytotypes in the same geographic area in Southern Brazil

Abstract

The karyotype of Akodon cursor (initially identified as A. arviculoides) had been reported with chromosomal numbers 14 and 15 in the South and Southeast and 16 in Northeastern Brazil. We found the three cytotypes in a region of Southern Brazil. The G-band patterns of these specimens were the same as those from southeastern and northeastern regions. Seventeen different combinations of chromosomes due to a complex rearrangement in pair 1 and pericentric inversions in pairs 2 and 3 were identified. Seven of these combinations are new to in the literature

Phylogenetic relationships and karyotype evolution in the sigmodontine rodent Akodon (2n = 10 and 2n = 16) from Brazil

“…Conventionally stained and banding patterns karyotypes of Akodon with 2n = 14, 15 and 15 have been reported by various authors (Yonenaga, 1972(Yonenaga, , 1975YonenagaYassuda, 1979); Sbalqueiro and Nascimento, 1996; and samples with a 2n = 9, 10 karyotype have been described by Silva and Yonenaga-Yassuda (1998).…”

“…cursor, respectively. After including our data (2n = 10 cytochrome-b sequences), the support for the relationships of these two taxa decreased to 72%, while Karyotype evolution and phylogeny of Akodon 471 (Rieger et al, 1995;Sbalqueiro and Nascimento 1996;Geise et al, 2001). Regardless of the karyotype diversity in Akodon specimens with 2n = 14, 15 and 16 karyotypes (a total of 28 karyotypes), Christoff (1997) and , considered these specimens as a single species (Akodon cursor) and explained the variation as being due to pericentric inversions in three different chromosome pairs, a complex rearrangement involving centric fusion with previous pericentric inversions of two pairs, trisomy of pair 7 and monosomy of the X chromosome.…”

“…n. (2n = 9, 10); A. cursor (sensu Christoff, 1997) with 2n = 14, 15 and 16 (the latter diploid number has been cited as belonging to Akodon aff. cursor by Rieger et al, 1995, andGeise et al, 2001); A. montensis (2n = 23-26); A. azarae (2n = 38); A. reinhardti (2n = 37, 38); A. lindberghi (2n = 42); A. serrensis (2n = 46); A. toba (2n = 42 or 43) and A. paranaensis (2n = 44) (Yonenaga, 1972;Yonenaga, 1975;Yonenaga-Yassuda, 1979;Yonenaga-Yassuda et al, 1987;Castro, 1989;Sbalqueiro, 1989;Geise et al, 1996Geise et al, , 1998Sbalqueiro and Nascimento, 1996;Silva and Yonenaga-Yassuda, 1998;Christoff et al, 2000). Silva and Yonenaga-Yassuda (1998) suggested that the new 2n = 9, 10 karyotype (Akodon sp.…”

Identificação das espécies brasileiras de Akodon (Rodentia: Cricetidae: Sigmodontinae) através da microestrutura dos pelos

“…Para A. mystax (Hershkovitz 1998), A. toba (Thomas 1921), A. reigi (González et al 1998), A. lindberghi (Hershkovitz 1990 (Musser & Carleton 2005), cujos estudos na sua grande maioria, são de caráter sistemático e desenvolvidos na Argentina (Del Valle & Busch 2003, Pereira et al 2005, Pardiñas & Teta 2007, Braun et al, 2008, 2010, Pardiñas 2009, no Brasil (Fagundes et al 1998, Geise et al 1998, Sbalqueiro & Nascimento 1996, Fagundes & Nogueira 2007, Queirolo & Granzinolli 2009), na Bolívia (Myers & Patton 1989a, Braun et al, 2008, no Chile (Simonetti et al 1985, Meserve et al 1991, Antinuchi & Busch 2000, no Paraguai (Yahnke 2006, Braun et al, 2008 e, no Peru e Bolívia (Myers & Patton 1989b, Myers et al 1990.…”

The use of PCR-RFLP as an identification tool for three closely related species of rodents of the genus Akodon (Sigmodontinae, Akodontini)

“…The distribution of Akodon cursor is restricted to lowlands and mid-elevation areas in the "floresta ombrófila densa" (dense rainforest) from northern (Paraíba, Pernambuco, Bahia) throughout southern Brazil (Espírito Santo, Rio de Janeiro, São Paulo, Minas Gerais and Paraná) (Yonenaga-Yassuda 1979, Maia and Langguth 1981, Liascovich and Reig 1989, Rieger et al 1995, Sbalqueiro and Nascimento 1996, Fagundes et al 1998, Geise et al 2001.…”