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4 resultados encontrados para: AUTOR: Hernández Ordoñez, Omar
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1.
Libro
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Resumen en: Inglés |
Resumen en inglés

Background: We assessed metrics of the metazoan parasite infracommunities of the dusky founder (Syacium papillosum) as indicators of aquatic environmental health of the Yucatan Shelf (YS) prior to oil extraction. We sampled the dusky founder and its parasites along the YS, mostly during the 2015 north wind season (November–April). Our aims were: (i) to determine whether the parasite infracommunity metrics of S. papillosum exhibit signifcant diferences among YS subregions; (ii) to determine whether the probability of the occurrence of its parasite species and individu‑ als were afected by environmental variables, nutrients, heavy metals and hydrocarbons at the seascape level; and (iii) to determine whether there were statistical diferences between the parasite infracommunity metrics of S. papillosum from YS and those of Syacium gunteri from the Campeche Sound. Multivariate statistical analyses and generalised additive models (GAMs) were used to examine the potential statistical associations between the contaminants, environmental variables and parasite community metrics, and the maximum entropy algorithm (MaxEnt) was used to characterise the habitat’s suitability for the parasite’s probability of occurrence. Results: We recovered 48 metazoan parasite species from 127 S. papillosum, with larval cestodes and digeneans being the most numerically-dominant. Multivariate analyses showed signifcant diferences in parasite infracommu‑ nity metrics among Western YS, Mid YS and Caribbean subregions, with the latter being the richest in species but not in individuals. The GAM and MaxEnt results indicated a negative efect of top predators (e.g. sharks and rays) removal on parasite metrics. The parasite infracommunities of S. papillosum were twice as rich in the number of species and individuals as those reported for S. gunteri from the Campeche Sound.

Conclusions: The significant differences among subregions in parasite metrics were apparently due to the interruption of the Yucatan current during the north wind season. The fishing of top predators in combination with an influx of nutrients and hydrocarbons in low concentrations coincides with an increase in larval cestodes and digeneans in S. papillosum. The dusky founder inhabits a region (YS) with a larger number of metazoan parasite species compared with those available for S. gunteri in the Campeche Sound, suggesting better environmental conditions for transmis‑ sion in the YS.


3.
Artículo
*En hemeroteca, SIBE-San Cristóbal
The northern naked-tailed armadillo in the Lacandona rainforest, Mexico: new records and potential threats
González Zamora, Arturo ; Arroyo Rodríguez, Víctor (coaut.) ; González Di Pierro, Ana María (coaut.) ; Lombera, Rafael (coaut.) ; De la Peña Cuéllar, Erika (coaut.) ; Peña-Mondragón, Juan Luis (coaut.) ; Hernández Ordoñez, Omar (coaut.) ; Muench, Carlos E. (coaut.) ; Garmendia, Adriana (coaut.) ; Stoner, Kathryn E. (coaut.) ;
Contenido en: Revista Mexicana de Biodioversidad Vol. 83, no. 2 (junio 2012), p. 581-586 ISSN: 1870-3453
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
53234-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
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Resumen en: Español | Inglés |
Resumen en español

Se revisaron los registros históricos en México de uno de los xenartros menos conocidos de Mesoamérica - el armadillo de cola desnuda (Cabassous centralis Miller, 1899). Se documentan 6 nuevos registros en la selva lacandona, sur de México. A través de entrevistas con pobladores locales, se evaluaron las amenazas potenciales para esta especie en la región. Además de ser localmente rara, nuestros resultados muestran que la cacería y las muertes por atropellamiento pueden ser las principales amenazas para esta especie en la región.

Resumen en inglés

We review historic occurrences in Mexico of one of the least known Xenarthra of Mesoamerica - the northern naked-tailed armadillo (Cabassous centralis Miller, 1899). We document 6 new records in the Lacandona rainforest, southern Mexico, and through interviews with local people, we assess potential threats for this species in the region. In addition to being locally rare, our results show that hunting and death by road-kill may be major threats to this species in the region.


4.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Range extensions of amphibians and reptiles in the southeastern part of the Lacandona rainforest, Mexico
Hernández Ordoñez, Omar ; Arroyo Rodríguez, Víctor (coaut.) ; González Hernández, Adriana (coaut.) ; Russildi, Giovanni (coaut.) ; Luna Reyes, Roberto (coaut.) ; Martínez Ramos, Miguel (coaut.) ; Reynoso, Víctor H. (coaut.) ;
Contenido en: Revista Mexicana de Biodiversidad Vol. 86, no. 2 (junio 2015), p. 457-468 ISSN: 1870-3453
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
56300-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
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Resumen en: Español | Inglés |
Resumen en español

La selva Lacandona representa uno de los bosques húmedos tropicales más diversos de México. Aunque algunos estudios han descrito a los anfibios y reptiles de la región, la mayoría de los listados herpetológicos proceden de la parte norte de la lacandona y no existen registros confirmados para muchas de las especies esperadas. Se han revisado bases de datos de colecciones científicas, la taxonomía y listados herpetológicos publicados para generar la lista más actualizada de especies de anfibios y reptiles de la región (35 anfibios y 90 reptiles). Además, con base en inventarios recientes (2007–2013) se estableció la extensión del área de distribución de 8 anfibios y 32 reptiles para la parte sureste de la selva Lacandona. Cuatro de estos 40 registros confirmaron la presencia de Dermophis mexicanus, Eleutherodactylus leprus, Pantherophis flavirufus y Bothriechis schlegelii en la región.

Resumen en inglés

The Lacandona rainforest represents one of the most diverse Mexican tropical wet forests. Although some studies have described the amphibians and reptiles of the region, most herpetological lists come from the northern part of the Lacandona, and there are no confirmed records for many of the expected species. We reviewed databases of scientific collections, taxonomy, and published herpetological lists to produce the most recent updated list of amphibian and reptile species in the region (35 amphibians and 90 reptiles). Furthermore, based on recent inventories (2007–2013) we establish 40 range extensions of 8 amphibians and 32 reptiles for the southeastern part of the Lacandona rainforest. Four out of these 40 records confirmed the occurrence of Dermophis mexicanus, Eleutherodactylus leprus, Pantherophis flavirufus, and Bothriechis schlegelii in the region.