Chromosomal characterization and comparative cytogenetic analysis of two species of<i>Proechimys</i>(Echimyidae, Rodentia) from the Caatinga domain of the State of Bahia, Brazil

Leal-Mesquita, E R; Yonenaga‐Yassuda, Yatiyo; Chu, T H; Rocha, Pedro Luís Bernardo da

doi:10.1080/00087114.1992.10797223

Cited by 16 publications

(15 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reis and Pessôa (1995) did not discuss the biogeographic context they presumably considered to designate minor as a subspecies of Trinomys albispinus (then allocated in the genus Proechimys ) instead of a valid species. Souza et al (2006) considered minor as a subspecies of Trinomys albispinus due to the fact that karyotypes that they and Leal-Mesquita et al (1992) attributed to albispinus and minor , respectively, shared the same diploid and autosomal fundamental numbers (2n=60, FN a =116), morphology of the sex chromosomes, and size of the first and second pairs of autosomes. Pessôa et al (2015b) textually described a topology presumably resulting from phylogenetic analyses based on cytochrome- b sequences by Souza (2011 [an unpublished Ph.D. dissertation]) in which samples attributed to minor were nested within a haplogroup formed by samples attributed to Trinomys albispinus sertonius (= Trinomys albispinus albispinus [sensu Pessôa et al 2015b and references therein]).…”

Section: Resultsmentioning

confidence: 99%

The mammalian faunas endemic to the Cerrado and the Caatinga

Gutiérrez¹,

Marinho‐Filho²

2017

View full text Add to dashboard Cite

Citation: Gutiérrez EE, Marinho-Filho J (2017) The mammalian faunas endemic to the Cerrado and the Caatinga. ZooKeys 644: 105-157. https://doi.org/10.3897/zookeys.644.10827 AbstractWe undertook a comprehensive, critical review of literature concerning the distribution, conservation status, and taxonomy of species of mammals endemic to the Cerrado and the Caatinga, the two largest biomes of the South American Dry-Diagonal. We present species accounts and lists of species, which we built with criteria that, in our opinion, yielded results with increased scientific rigor relative to previously published lists -e.g., excluding nominal taxa whose statuses as species have been claimed only on the basis of unpublished data, incomplete taxonomic work, or weak evidence. For various taxa, we provided arguments regarding species distributions, conservation and taxonomic statuses previously lacking in the literature. Two major findings are worth highlighting. First, we unveil the existence of a group of species endemic to both the Cerrado and the Caatinga (i.e., present in both biomes and absent in all other biomes). From the biogeographic point of view, this group, herein referred to as Caatinga-Cerrado endemics, deserves attention as a unit -just as in case of the Caatinga-only and the Cerrado-only endemics. We present preliminary hypotheses on the origin of these three endemic faunas (Cerrado-only, Caatingaonly, and Caatinga-Cerrado endemics). Secondly, we discovered that a substantial portion of the endemic mammalian faunas of the Caatinga and the Cerrado faces risks of extinction that are unrecognized in the highly influential Red List of Threatened Species published by the International Union for Conservation of Nature (IUCN). "Data deficient" is a category that misrepresents the real risks of extinction of these species considering that (a) some of these species are known only from a handful of specimens collected in a single or a few localities long ago; (b) the Cerrado and the Caatinga have been sufficiently sampled to guarantee collection of additional specimens of these species if they were abundant; (c) natural habitats RESEARCH ARTICLE Launched to accelerate biodiversity research A peer-reviewed open-access journalEliécer E. Gutiérrez & Jader Marinho-Filho / ZooKeys 644: 105-157 (2017) 106 of the Cerrado and the Caatinga have been substantially altered or lost in recent decades. Failures either in the design of the IUCN criteria or in their application to assign categories of extinction risks represent an additional important threat to these endemic faunas because their real risks of extinctions become hidden. It is imperative to correct this situation, particularly considering that these species are associated to habitats that are experiencing fast transformation into areas for agriculture, at an unbearable cost for biodiversity.

show abstract

Section: Resultsmentioning

confidence: 99%

The mammalian faunas endemic to the Cerrado and the Caatinga

Gutiérrez¹,

Marinho‐Filho²

2017

View full text Add to dashboard Cite

show abstract

“…Previously, chromosome evolution studies were essentially based on the comparison of banding patterns (Yonenaga-Yassuda et al 1975, 1987a, Leal-Mesquita et al 1992, Silva and Yonenaga-Yassuda 1999). Later, the association of cytogenetics with molecular biology allowed for a new important approach for studying karyotype evolution.…”

Section: Introductionmentioning

confidence: 99%

Advances in cytogenetics of Brazilian rodents: cytotaxonomy, chromosome evolution and new karyotypic data

Di-Nizo¹,

Banci²,

Sato-Kuwabara³

et al. 2017

CCG

View full text Add to dashboard Cite

Rodents constitute one of the most diversified mammalian orders. Due to the morphological similarity in many of the groups, their taxonomy is controversial. Karyotype information proved to be an important tool for distinguishing some species because some of them are species-specific. Additionally, rodents can be an excellent model for chromosome evolution studies since many rearrangements have been described in this group.This work brings a review of cytogenetic data of Brazilian rodents, with information about diploid and fundamental numbers, polymorphisms, and geographical distribution. We point out that, even with the recent efforts on cytogenetic studies in this group, many species lack karyotypic data. Moreover, we describe for the first time the karyotype of Carterodon sulcidens (Lund, 1838) (Family Echimyidae), a new fundamental number for an undescribed species of Neacomys Thomas, 1900 (Family Cricetidae, Subfamily Sigmodontinae), and illustrate the karyotype of a Brazilian specimen of Mus musculus Linnaeus, 1758 (Family Muridae). This review compiles the cytogenetic data on Brazilian rodents reported in the last three decades, after the last revision published in 1984, including synonyms, chromosomal variations, and geographic distribution. Additionally, it also reinforces that Brazilian biodiversity is still poorly known, considering the new data reported here.

show abstract

“…These small chromosomes were described as B chromosomes by Yonenaga-Yassuda et al (1985) since the 60 A chromosomes showed almost complete coincidence in G-bands with the 60 A chromosomes in the closely related T. albispinus, a species lacking these dot-like chromosomes (Leal-Mesquita et al, 1992). However, Lara and Patton (2000) evaluated the phylogenetic relationships of Trinomys species using cytochrome b sequence data and suggested that T. iheringi and T. albispinus are not closely related but belong to separate clades.…”

mentioning

confidence: 99%

Are the dot-like chromosomes in <i>Trinomys iheringi</i> (Rodentia, Echimyidae) B chromosomes?

Fagundes

Camacho²,

Yonenaga‐Yassuda³

2004

Cytogenet Genome Res

Self Cite

View full text Add to dashboard Cite

In this article we review the existing cytogenetic information on the polymorphic dot-like chromosomes in Trinomys iheringi, the only species in the family Echimyidae harboring them, and provide new data on the frequency, banding properties, meiotic behavior and DNA composition of these minute chromosomes. Since no individuals lacking these chromosomes have hitherto been found, one of the main properties of B chromosomes, i.e. dispensability, has not yet been tested, so that some reasonable doubt might exist on whether they are true B chromosomes. The dot-like chromosomes were also present in the twelve new individuals analyzed, showed intraindividual variation in number, most likely due to mitotic instability during development, failed to show C-bands, showed late-replication, paired among them in meiosis, but not with the large chromosomes, and appeared to be mainly composed of telomeric DNA. These results suggest that these dot-like chromosomes might actually be mitotically unstable micro B chromosomes showing very high frequency in the natural populations thus far analyzed. But, to be confident of this conclusion, individuals lacking the dot-like chromosomes should actively be searched in future research to test their dispensability.

show abstract

Chromosomal characterization and comparative cytogenetic analysis of two species ofProechimys(Echimyidae, Rodentia) from the Caatinga domain of the State of Bahia, Brazil

Cited by 16 publications

References 14 publications

The mammalian faunas endemic to the Cerrado and the Caatinga

The mammalian faunas endemic to the Cerrado and the Caatinga

Advances in cytogenetics of Brazilian rodents: cytotaxonomy, chromosome evolution and new karyotypic data

Are the dot-like chromosomes in <i>Trinomys iheringi</i> (Rodentia, Echimyidae) B chromosomes?

Contact Info

Product

Resources

About