Términos relacionados

2 resultados encontrados para: AUTOR: González Salazar, Constantino
  • «
  • 1 de 1
  • »
1.
Artículo
*En hemeroteca, SIBE-Campeche, SIBE-Chetumal, SIBE-San Cristóbal
Aplicando modelos de nicho ecológico para predecir áreas potenciales de hibridación entre Crocodylus acutus y C. moreletii
Escobedo Galván, Armando H. ; González Salazar, Constantino (coaut.) ;
Contenido en: Quehacer Científico en Chiapas. Segunda Época Vol. 1, no. 11 (enero-julio 2011), p. 27-35 ISSN: 1405-6542
Bibliotecas: Campeche , Chetumal , San Cristóbal
Cerrar
SIBE Campeche
51381-30 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
51381-20 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
51381-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Campeche, SIBE-Chetumal, SIBE-San Cristóbal
PDF
Resumen en: Español | Inglés |
Resumen en español

Se aplicaron modelos de nicho ecológico utilizando el algoritmo GARP para predecir el área de distribución potencial del coco drilo americano (Crocodylus acutus), el cocodrilo de pantano (C. moreletii) y los híbridos entre ambas especies con base en estudios genéticos previos; una vez realizados los modelos, se evaluó la pérdida de sitios con hábitat natural por las actividadeshumanas y las zonas de hibridación para la distribución potencial de poblaciones genéticamente puras de ambas especies. Los resultados mostraron que la distribución de ambas especies podría ser mayor a la conocida actualmente. Para el cocodrilo americano, los modelos mostraron que su distribución potencial incluye gran parte de la península de Yucatán y Tabasco, donde se ha considerado que la especie posiblemente esté ausente; mientras que la distribución potencial del cocodrilo depantano incluye partes del sur de Tamaulipas hasta la parte norte de Honduras. Los sitios de coincidencia entre ambas especies sugieren que en la península de Yucatán se presenta una alta probabilidad de hibridación y/o introgresión. El impacto de la transformación de hábitat y las zonas potenciales de hibridación reduce el área potencial de distribución del cocodrilo de pantano y cocodrilo americano en 87% y 86%, respectivamente, en México. Con base en los resultados de este estudio se discuten algunas implicaciones en cuanto al estado de conservación de ambas especies, tanto a escala local como regional.

Resumen en inglés

The potential distribution of American crocodile (Crocodylus acutus), Morelet’s crocodile (C. moreletii), and hybrids of bothspecies based on genetic studies available, was estimated by applying ecological niche models with GARP algorithm. Once themodels were applied, we evaluated the impact of transformed habitat and hybridization areas on the potential distribution of genetically pure populations of both species. The results showed that the distribution of both species could be larger than it isat the moment. The ecological niche models showed that potential distribution of the American crocodile includes some areasof the Yucatan Peninsula and the state of Tabasco, where this species has been considered absent; for Morelet’s crocodile, the models included areas from the southern region of the state of Tamaulipas up to northern Honduras. The overlap areasbetween American and Morelet’s crocodiles showed that the Yucatan Peninsula has a high probability of hybridization and/orintrogression. The impact of transformed habitat and hybridization areas, decreases the potential distribution areas for both C. moreletii and C. acutus in 87 percent and 86 percent, respectively, in Mexico. Based on our results, we present some localand regional implications as for the conservation status for both species.


2.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Conservation assessment of Guaiacum sanctum and Guaiacum coulteri: historic distribution and future trends in Mexico
López Toledo, Leonel ; González Salazar, Constantino (coaut.) ; Burslem, David F. R. P (coaut.) ; Martínez Ramos, Miguel (coaut.) ;
Contenido en: Biotropica Vol. 43, no. 2 (March 2011), p. 246-255 ISSN: 0006-3606
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
50517-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

Guaiacum sanctum and Guaiacum coulteri are long-lived Mesoamerican timber tree species heavily exploited throughout their range and considered to be at risk of extinction. Both species are included on the IUCN Red List and on CITES Appendix II, but there has been no formal assessment of the conservation status of either species. We used ecological niche modeling and rapid assessments of local density and population size structure to provide such evaluations. For the year 2000, we estimated geographic range sizes for G. sanctum and G. coulteri of 95,422 and 130,973 km2, respectively. The main core remaining habitat for G. sanctum occurs in Campeche State (Yucatan Peninsula), where populations exhibit high adult abundance and profuse regeneration. Several areas along the Mexican Pacific coast remain with suitable habitat for G. coulteri. Guaiacum coulteri is at greater risk as only 1.3 percent of its current habitat is protected, which contrasts with the 13.2 percent of current habitat protected for G. sanctum. We projected that available habitat for G. sanctum and G. coulteri will decline by a further 30–50 percent by 2020 if estimated habitat loss rates continue. We suggest that under the IUCN criteria, the conservation status of G. sanctum and G. coulteri should be updated to near threatened and vulnerable, respectively. Additionally, we conclude that the amount of protected habitat needs to be increased to safeguard both species. Our study provides a quantitative basis for updating the conservation status of both species and illustrates an assessment framework that could be applied to other threatened tree species.