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3 resultados encontrados para: AUTOR: Ríos Mendoza, Evelyn Patricia
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1.
- Artículo con arbitraje
Genetic variation in Heteromys nelsoni (Rodentia: Heteromyidae) reveals its possible natural extinction
Ríos Mendoza, Evelyn Patricia (autora) ; Lorenzo Monterrubio, Consuelo (autora) ; Álvarez Castañeda, Sergio Ticul (autor) (1970-) ;
Disponible en línea
Contenido en: Mammalia Vol. 81, no. 3 (April 2016), p. 1-8 ISSN: 1864-1547
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Resumen en: Inglés |
Resumen en inglés

Heteromys nelsoni is restricted to cloud forests in the mountain range of the southern state of Chiapas, Mexico, and western Guatemala. It is considered an endemic species, under special protection, and endangered because its habitat has been modified by excessive logging and extensive cattle grazing. We evaluated the genetic variation of H. nelsoni and the relationship between individuals from two geographic areas surrounding Cerro Mozotal, Chiapas, using three mitochondrial genes [cytochrome b (Cyt b), cytochrome c oxidase subunit 1 (COI), and control region (D-Loop)]. Low genetic diversity (d<0.9, π<0.005) and average divergence (<0.6%) in mtDNA were observed among the specimens examined. The haplotypes are distributed throughout the areas sampled; therefore, no areas where individuals showed genetic identity, with exclusive haplotypes, were found. Heteromys nelsoni populations have undergone a very recent demographic contraction and the low genetic diversity observed indicates an unfavorable future for the species. Changes in the climatic conditions coupled with other anthropogenic pressures have likely reduced the optimal habitat area for the species. It is imperative to develop programs aiming to reduce the probable risk of extinction of this species.


2.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

The Mexican Barcode of Life (MEXBOL) project started as an initiative by researchers who wanted México to join the international DNA barcoding (iBOL) collaboration to establish a genetic system of species identification and discovery. MEXBOL has three main nodes associated with different research institutions in the northern, central, and southern parts of the country. At the beginning of 2009, the laboratories of the three nodes began to operate with support from the University of Guelph in Canada where DNA barcoding began in 2003. By the end of 2011, the laboratories in México will be completely equipped and fully operational. The project is funded by the Consejo Nacional de Ciencia y Tecnología (CONACyT). In addition, the steering committee of MEXBOL supports the Comisión Nacional para el Conocimiento y Uso de la Biodiversidad (CONABIO) initiative to offer grants to any university and research center for barcoding collections of Mexican specimens. We present preliminary results of projects dealing with barcoding Mexican mammals. The aims of these analyses are to evaluate the importance of the DNA barcoding (using cytochrome c oxidase subunit I gene; COI) for the identification of species, study of genetic diversity, and taxonomic review. Our preliminary data suggest that DNA barcodes can be used for the discovery of cryptic species and have important implications to the understanding of the mega-diversity of mammals in México.


3.
- Artículo con arbitraje
Variación morfológica y morfométrica de Heteromys desmarestianus en Chiapas, México
Espinoza, José ; Lorenzo Monterrubio, Consuelo ; Ríos Mendoza, Evelyn Patricia ;
Contenido en: Therya Vol. 2, no. 2 (2011), p. 139-154 ISSN: 2007-3364
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Resumen en: Español | Inglés |
Resumen en español

Se examinaron nueve medidas craneales y cuatro morfológicas de ejemplares de Heteromys desmarestianus de diversas regiones geográficas de Chiapas, con el fin de ampliar el conocimiento taxonómico y sistemático de la especie y estimar los niveles de variación morfométrica y morfológica de la misma a lo largo de su distribución en la entidad. La distribución geográfica de las subespecies de H. desmarestianus en Chiapas no es uniforme y ocurre en subprovincias a diferentes altitudes y tipos de vegetación. Existe variación en morfometría craneal y morfológica (coloración del pelaje) entre las subespecies de H. desmarestianus. H. d. goldmani presentó mayores diferencias con respecto a H. d. desmarestianus y H. d. griseus, por lo que se propone se reconsidere su cambio a nivel específico. Por el contrario H. d. desmarestianus y H. d. griseus no presentaron diferencias morfométricas y morfológicas significativas, por lo que puede seguirse considerando a H. d. griseus en sinonimia con H. d. desmarestianus.

Resumen en inglés

Nine cranial and four morphologic measurements of Heteromys desmarestianus specimens of different geographic regions of Chiapas were examined, with the aim of extending the taxonomic and systematic knowledge of the species and to estimate its levels of morphometric and morphologic variation throughout its distribution in the state of Chiapas. The geographic distribution of the subspecies of H. desmarestianus in Chiapas is not uniform and it occurs in different subprovinces in diverse altitudes and types of vegetation. There are variations in cranial morphometry and morphology (pelage coloration) among the subspecies of H. desmarestianus. Particularly, H. d. goldmani presented larger differentiation with respect to H. d. desmarestianus and H. d. griseus; it is for this reason that we reconsider its change at specific level. Nevertheless, H. d. desmarestianus and H. d. griseus do not present significant differences in cranial and pelage color characteristics, and H. d. griseus can be considered in synonymy with H. d. desmarestianus.