13,294 research outputs found
Translocation as a conservation tool for endangered tortoises in Mexico
No full textLos programas de translocación se han enfocado principalmente en aves y mamíferos, sin embargo, el
aumento de la atracción y aceptación de los reptiles por el público ha permitido la creación de espacios para su conservación
en las últimas décadas. Con más del 80 % de especies de tortugas terrestres y dulceacuícolas que se encuentran en
peligro de extinción en el mundo, las translocaciones podrían ser la única opción para recuperar poblaciones. En México,
33 especies de quelonios, de las 48 descritas, cuentan con algún estatus de protección, sin embargo, ningún programa
de translocación ha sido llevado a cabo. Es por ello que revisamos literatura abierta sobre translocaciones de tortugas en
diversas partes del mundo y desarrollamos una guía de translocación para mejorar la tasa de éxito. Los principales factores
para realizar una translocación exitosa que identificamos son: hábitat idóneo, aclimatación (liberación blanda), elección de
los candidatos idóneos a ser translocados, el monitoreo después de la translocación y la aceptación por el público de la
translocación. La información proporcionada por esta revisión será útil para desarrollar estrategias de translocaciones de
tortugas en México y otras partes del mundo
T2 - Paréntesis -P1 / Dra. Ana Bertha Gatica Colima. (Parte 1).
No full textDra. Ana Bertha Gatica Colima. Profesora Investigadora UACJ-ICB. -Bióloga por la Universidad Autónoma de Baja California (UABC) -Maestría en Manejo de Ecosistemas de Zonas Áridas (UABC) -Diplomado en Herpetología (Sociedad Herpetológica Mexicana) -Doctorado (Área Recursos Naturales) por la Universidad Autónoma de Chihuahua. -Maestra fundadora del Programa de Biología (UACJ). -Trabajo en UACJ desde 1997. Líneas de Investigación: -Ecología y biodiversidad animal. -Manejo de fauna silvestre. -Herpetología. Publicaciones: https://orcid.org/0000-0002-6117-1327 Contacto: [email protected] Redes Sociales UACJ Tv * Facebook: UACJ Tv Oficial * Twitter: @UACJ tv * Correo: [email protected] (Paréntesis de Investigación) Es una emisión donde conocemos los trabajos, proyectos y avances de investigación de profesores de la UACJ. Este es un programa cultural y educativo sin fines de lucro, realizado con el apoyo de la Coordinación General de Investigación y Posgrado de la UACJ. Derechos Reservados UACJ TV - Universidad Autónoma de Ciudad Juárez 2019
Diet of the Golden Eagle during the breeding season in northwestern Chihuahua, Mexico
No full textThe diet of the Golden Eagle (Aquila chrysaetos) was studied in 4 territories in northwestern Chihuahua,
México, during the breeding season. Prey remains and pellets were collected from 4 nests during 2014, 2015,
and 2016. We identified 12 vertebrate species. Black-tailed jackrabbits (Lepus californicus) were the most important
prey remains in terms of frequency (72%) and ingested biomass (86%). We estimated mean prey size to be 1291 g (SE =
3364), indicating that Golden Eagles prey on medium-sized animals (e.g., lagomorphs). The main threats to Golden
Eagles are connected to habitat loss and habitat fragmentation, but other factors also affect eagles. We hope our information
will help to establish better species management programs
Declaración de Ana María Caracoche de Gatica
No full textDeclaración de Ana María Caracoche de Gatica, secuestrada con su marido Óscar y sus hijos María Eugenia y Felipe Martín, ambos robado
Evaluation of pocket gopher diet in a perennial productive area
No full textThe desert pocket gopher (Geomys arenarius) is a fossorial herbivorous rodent of the family Geomyidae. Its distribution range is restricted to New Mexico and Texas, in the United States of America, and northern Chihuahua, in México. The Médanos de Samalayuca Flora and Fauna Protection Area (MSFFPA) is located in northern Chihuahua. Different economic activities are carried out in this region, mainly irrigated crops of pecans (Carya illinoinensis). Populations of G. arenarius have been recorded within these areas. Therefore, the objective of this work was to define the extent of the trophic niche and the changes in the physical condition of G. arenarius in a ranch within the MSFFPA over three contrasting seasons (dry, wet, and post-wet). Forty G. arenarius specimens were collected from Arantxa Ranch. Morphometric measurements and the weight of collected individuals were recorded, and the digestive tract was removed to prepare histological slides. Seven 25 m²-quadrants were established, and the species of the vegetation cover were recorded and collected for reference. The Seasonal Fitness Index (IK) and Levin’s Niche Breadth Index were calculated. Males had higher average measurements and weight than females. The IK was 2.82 ± 0.47 in males and 2.64 ± 0.61 in females. Significant differences in the IK between seasons were only found in females. The correlation between IK and plant cover was strong for males and females. The diet mainly comprised Physalis hederifolia, Dimorphocarpa wislizeni, and Cenchrus incertus. Levin’s index showed that G. arenarius is a specialist rodent. Sexual dimorphism was evident, with males larger than females. The physical condition index of gophers is influenced by resource availability. In other studies, this parameter has been related to changes in food availability. It has been reported that gophers tend to feed mainly on crops; however, pecan cultivation was not a major element in the diet of the desert pocket gopher, as it feeds on the vegetation associated with crops. Gophers are considered generalists; nonetheless, the present study showed that G. arenarius is a specialist, although this may be a consequence of anthropogenic activities
Fabáceas del Área de Protección de Flora y Fauna Médanos de Samalayuca, Chihuahua, México
No full textEl Área de Protección de Flora y Fauna Médanos de Samalayuca (APFFMS) con una superficie de 631.82 km² se localiza entre los municipios de Juárez, Ahumada y Guadalupe D.B., en el estado de Chihuahua, con cuenta con dos sistemas de sierras y un sistema complejo de dunas de arena de sílice. El clima es del tipo BWKx’ (e’) con una precipitación promedio anuales de 212 mm. La vegetación es dominada principalmente por Larrea tridentata y Prosopis glandulosa. Estudios florísticos en el estado de Chihuahua revelan que la familia Fabaceae es una de las más importantes en cuanto a diversidad, abundancia e importancia económica. Por ello, el objetivo del presente trabajo es actualizar la lista de Fabaceae del Programa de Manejo del APFF a partir de los ejemplares colectados del proyecto PJ018. Se establecieron cinco zonas de muestreo en la temporada seca, húmeda y post-húmeda (2017-2018) en búsqueda de leguminosas. Los resultados de este trabajo incrementan substancialmente el inventario previo de Fabaceae para el área dentro del Programa de Manejo del APFFMS al registrarse 27 taxa. El presente trabajo aumenta el conocimiento florístico y contribuye potencialmete a la toma de decisiones para su conservación y planeación
Reporte de Amblyomma nodosum Neumann (Acari: Ixodidae) en Tamandua tetradactyla (Linnaeus), departamento de Cordillera, Paraguay
No full texthttp://www.mades.gov.py/wp-content/uploads/2020/10/24260-66_20201023_Peters_Amblyomma.pd
New species of flea of the genus Dactylopsylla Jordan (Insecta: Siphonaptera) from the Flora and Fauna Protection Area Médanos de Samalayuca, Chihuahua, Mexico
No full textA new species of Dactylopsylla Jordan, parasites of Geomyidae rodents from Chihuahua, is described and illustrated as D.
samalayucae n. sp. This species is compared with their morphologically closest relatives. Males are characterized by the
shape of the upper lobe of the inmovable and movable process, the shape and chaetotaxy of the distal arm of sternum IX
and the shape of the crochet; and females by the contour of the distal margin of sternum VII. The geographical distribution
of Dactylopsylla is extended to the Chihuahuan desert in Mexico as D. samalayucae n. sp. is reported from south of the
Natural Protected Area Médanos de Samalayuca (MS). A recent key to Dactylopsylla species is updated with inclusion
of the new species
Toxicological comparison of Crotalus ruber lucasensis venom from different ecoregions of the Baja California Peninsula
No full textThe Baja California Peninsula possesses a mosaic of ecoregions that offers a wide variety of environments for the species that here inhabit. Here we report biological variations in. Crotalus ruber lucasensis venom from arid, semiarid and tropical eco-regions. Lethal (1.4–6.8 mg/kg), edematogenic (0.3–0.5 μg) and defibrinogenating (from non-detectable to 20 μg) activities were found to have significant differences among eco-region
Thermoregulation in a saxicolous population of the lizard Urosaurus ornatus from the northern Chihuahuan Desert, Mexico
No full textEnvironmental temperatures often regulate the activity and physiological processes of ectotherms. Because environmental temperatures can vary significantly among seasons, lizards exposed to different thermal conditions in different months could differ in how they thermoregulate or behave. Here, we present a combination of field, laboratory, and modeling approaches to examine thermoregulation, habitat thermal quality, and hours of thermal restriction on activity in a saxicolous population of Urosaurus ornatus in two thermally contrasting months (June and October) in a micro-insular mountain system in the northern Chihuahuan Desert in Mexico. Both active and preferred body temperatures did not vary between months. In this population, U. ornatus is an active thermoregulator with highly accurate and efficient thermoregulation despite the thermal quality in both months. However, during the breeding season (June) activity is restricted (i.e., high number of hours of restriction) compared to the non-breeding season (October). Therefore, our results suggest that this saxicolous population of U. ornatus could be threatened by global climate change and it is essential to determine a conservation strategy for this population
- …
