Bottlenecks and Dispersal in the Tuco-Tuco Das Dunas,<i>Ctenomys flamarioni</i>(Rodentia: Ctenomyidae), in Southern Brazil

Fernández, Guillermina; Stolz, José Francisco Bonini; Freitas, Thales Renato Ochotorena de

doi:10.1644/06-mamm-a-210r1.1

Cited by 46 publications

(49 citation statements)

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“…Ctenomys lami is an endemic species inhabiting a sandy region named 'Coxilha das Lombas', along a narrow line of old dunes that extends from north of Guaíba Lake to the northwestern sandbanks of Barros Lake (Freitas, 2001;Freitas, 2007). This region is bounded on the northwest by Pachecos Swamp, and on the southeast by Touros Swamp.…”

Section: 2ctenomys Lamimentioning

confidence: 99%

“…The combined 2n and FN form 26 different karyotypes, and their distribution along the 78 x 12 km area of collection sites reveals four block populations: block A with 2n = 54, 55a, and 56a; block B with 2n = 57 and 58; block C with 2n = 54 and 55, and block D with 2n = 56b and 55b ( Figure 2) (Freitas, 1990;Freitas, 2007). Although they share the same diploid number, individuals with karyotypes "a" or "b" were differentiated by their distinct rearrangements and areas of occurrence (Freitas, 2007).…”

Section: 2ctenomys Lamimentioning

confidence: 99%

“…Because chromosomes correspond to the highest levels of differentiation among different markers (Wlasiuk et al, 2003), Freitas (2007) calculated the genetic differentiation by chromosomal rearrangements among the four C. lami population blocks, showing that the high Fst values among them indicate a well-defined population structure in these blocks. This is in agreement with the model proposed by Rieseberg (2001), which states that chromosomal rearrangements affect gene flow.…”

Section: 2ctenomys Lamimentioning

confidence: 99%

“…Chromosomal rearrangements by Robertsonian fusions should be responsible for new karyotype forms for both species, and their evolutionary future is uncertain. Besides the risk of extinction of local populations of C. minutus and of the species C. lami, the evolutionary processes in which they are involved, such as the hybrid zones near Barros Lake, are also endangered for both species (Freitas, 2001;Gava and Freitas, 2003;Freitas, 2006Freitas, , 2007.…”

Section: Hybrid Zones Between Ctenomys Minutus and C Lamimentioning

confidence: 99%

“…lami Freitas, 2001, occur in southern Brazil, in the States of Rio Grande do Sul and Santa Catarina. These four species have been investigated in more details (Freitas and Lessa, 1984;Freitas, 1995Freitas, , 1997Silva et al, 2000a,b;Freitas, 2001;Gava and Freitas, 2002;Heuser et al, 2002;Gava andFreitas, 2003, 2004;El Jundi and Freitas, 2004;Freitas, 2006;Freitas, 2007;Fernández-Stolz et al, 2007). We review the conservation status of tuco-tucos in southern Brazil, and relate these data to the geological history of a particular area, the Coastal Plain of Rio Grande do Sul and Santa Catarina.…”

Section: Introductionmentioning

confidence: 99%

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The conservation status of the tuco-tucos, genus Ctenomys (Rodentia: Ctenomyidae), in southern Brazil

et al. 2007

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The goal of conservation biology should be related to the preservation of species and also to the evolutionary and ecological processes that were responsible to form them and that are still acting. We review the conservation status of the species of tuco-tuco (Ctenomys torquatus, C. lami, C. minutus, and C. flamarioni) from southern Brazil, and relate these data to the geological history of a particular area in that region, the Coastal Plain of the States of Rio Grande do Sul and Santa Catarina. The implications of the data on these species from the Southeastern Brazil are also discussed in relation to the evolution and risk of extinction of these subterranean rodents.Keywords: Ctenomys, subterranean rodents, hybrid zones, threatened species, Coastal Plain of Rio Grande do Sul. O status da conservação dos tuco-tucos, gênero Ctenomys(Rodentia: Ctenomyidae), no sul do Brasil ResumoO objetivo da biologia da conservação deve estar relacionado com a preservação das espécies e também com os processos evolutivos e ecológicos que foram responsáveis por sua formação e que continuam ocorrendo. Este trabalho revisa o status de conservação das espécies de tuco-tuco (Ctenomys torquatus, C. lami, C. minutus e C. flamarioni) do sul do Brasil, assim como a relação entre estas informações e a história geológica de uma região de especial importância, a planície costeira dos Estados do Rio Grande do Sul e Santa Catarina. São também discutidas as implicações do conhecimento acumulado sobre as espécies de tuco-tuco no sul do Brasil em relação aos aspectos evolutivos e a ameaça de extinção que estas espécies de roedores subterrâneos sofrem.Palavras-chave: Ctenomys, roedores subterrâneos, zonas híbridas, espécies ameaçadas, planície costeira do Rio Grande do Sul.

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Section: 2ctenomys Lamimentioning

confidence: 99%

Section: 2ctenomys Lamimentioning

confidence: 99%