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2,000 resultados encontrados para: TEMA: Animales
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1.
Libro
Investigación para el desarrollo regional sur: Chiapas, Guerrero y Oaxaca
Toledo Flores, Javier (editor) ;
Distrito Federal, México : Consejo Nacional de Ciencia y Tecnología :: Sistema de Investigación Benito Juárez , s.f.
Clasificación: CH/307.12097275 / I5
Bibliotecas: San Cristóbal , Tapachula
Cerrar
SIBE San Cristóbal
ECO010012034 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
ECO020012039 (Disponible) , ECO020012038 (Disponible)
Disponibles para prestamo: 2

2.
Libro
Ley general del equilibrio ecológico y la protección al ambiente: análisis de la reforma de 1996 / Emilio Dardón Bravo
Dardón Bravo, Emilio ;
México : Mundi Comunicaciones , s.f.
Clasificación: 346.044 / D3
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
ECO020009332 (Disponible)
Disponibles para prestamo: 1

3.
Libro
Manual: manejo y producción de bovinos f1 en traspatio / Ramón Fajardo Ruíz
Fajardo Ruíz, Ramón ;
Guadalajara, Jalisco, México : Campo , s.f.
Clasificación: F/636.2 / F3
Bibliotecas: Villahermosa
Cerrar
SIBE Villahermosa
ECO050003651 (Disponible)
Disponibles para prestamo: 1

4.
Libro
Manual de identificación de aves residentes y migratorias: Área de Protección de Flora y Fauna Metzabok / textos: Manuela Morales Herández ; ilustraciones: José Guadalupe Coutiño Monzón
Morales Herández, Manuela ;
Distrito Federal, México : Comisión Nacional de Áreas Naturales Protegidas. Área de Protección de Flora y Fauna Metzabok , s.f.
Clasificación: C CH/598.2097275 / M6
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
ECO010018650 (Disponible)
Disponibles para prestamo: 1
Resumen en: Español |
Resumen en español

Contar con una gran biodiversidad en nuestro país, nos enorgullece como mexicanos, preservemos nuestras riquezas naturales y culturales protegiendo las áreas naturales protegidas, donde habitan maravillosos seres vivos, ya que la transformación de su ambiente y su comercio es la principal amenaza a su supervivencia.


5.
Libro
Proyecto para la conservación, manejo y aprovechamiento sustentable de los crocodylia en México (COMACROM)
México : Secretaría de Medio Ambiente, Recursos Naturales y Pesca :: Instituto Nacional de Ecología , s.f.
Clasificación: 333.95716 / P7
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
ECO020007779 (Disponible)
Disponibles para prestamo: 1

6.
Artículo
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A new species of Travisia (Annelida, Travisiidae) from Campos Basin, Brazil
Rizzo, Alexandra Elaine (autora) ; Salazar Vallejo, Sergio I. (autor) ;
Contenido en: Studies on Neotropical Fauna and Environment (May 2020), páginas 1-9 ISSN: 0165-0521
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Resumen en: Inglés |
Resumen en inglés

Travisia Johnston, 1840 is the only genus of the family Travisiidae Hartmann-Schröder, 1971. Travisiid species have body relatively short, papillated, fusiform, often tapered anteriorly and posteriorly, and swollen medially. They are found mainly in deep-sea sediments. Several faunistic accounts from different locations in the Brazilian coast have included records of Travisia species that need to be reassessed. The aim of this study was to describe Travisia araciae n. sp., a new species from Campos Basin, off Rio de Janeiro, Southern Brazil. The new species differs from other similar species by having 23 pairs of branchiae from chaetiger 2, and interramal pores from chaetiger 1. An updated key to identification for all species in the genus is also included.


7.
Artículo
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Accessing cryptic diversity in Neotropical rattlesnakes (Serpentes: Viperidae: Crotalus) with the description of two new species
Carbajal Márquez, Rubén Alonso (autor) ; Cedeño-Vázquez, J.R. (autor) ; Martínez Arce, Arely (autora) ; Neri Castro, Edgar (autor) ; Machkour M'Rabet, Salima (autora) ;
Contenido en: Zootaxa Vol. 4729, no. 4 (January 2020), p. 451-481 ISSN: 1175-5334
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Resumen en español

Los miembros del complejo de especies Crotalus durissus tienen una amplia distribución desde México hasta Argentina, principalmente en zonas con bosque tropical deciduo. Aunque se reconocen actualmente cuatro especies (C. culminatus, C. durissus, C. simus y C. tzabcan), los límites entre estas no son claros. Estudios genéticos previos sugieren que C. durissus y C. simus pueden ser parafiléticos y que al menos una especie críptica puede estar presente. Analizamos una secuencia de 2596 pares de bases de ADN provenientes de tres genes mitocondriales y uno nuclear, para inferir las relaciones filogenéticas en las especies de víboras de cascabel neotropicales. Por otro lado, se examinaron especímenes de museo, silvestres y ejemplares en cautiverio para analizar caracteres morfológicos. Nuestros resultados sugieren que la taxonomía actual del grupo de especies Crotalus durissus no refleja su historia evolutiva. Los resultados obtenidos muestran un fuerte apoyo para cinco linajes independientes en Crotalus simus (sensu lato) con evidencia genética y morfológica para tres taxones previamente reconocidos y dos especies nuevas, y tres linajes en C. durissus, que representan hipótesis de especies para ser probadas con evidencia adicional. También encontramos apoyo para mantener a C. totonacus en el complejo de especies Crotalus molossus. Sugerimos cambios taxonómicos conservadores para el complejo y especies relacionadas, pero se necesita más evidencia (e.g., morfología, ecología y composición bioquímica del veneno), para aclarar las relaciones entre especies.

Resumen en inglés

Members of the Crotalus durissus species complex are widely distributed from Mexico to Argentina in areas with mainly seasonally dry tropical deciduous forest. Although four species (C. culminatus, C. durissus, C. simus and C. tzabcan) are currently recognized, species limits remain to be tested. Previous genetic studies suggest that C. durissus and C. simus may be paraphyletic and that at least one cryptic species may be present. We analyzed 2596 bp of DNA sequence data from three mitochondrial and one nuclear gene to infer phylogenetic relationships in the Neotropical rattlesnakes. We also examined museum and wild specimens as well as captive animals to analyze morphological characters. Our results suggest that current taxonomy of the Crotalus durissus species complex does not reflect evolutionary history. We found strong support for five independent lineages within Crotalus simus (sensu lato), with genetic and morphological evidence for three previously recognized taxa and two new species, as well as three major lineages within C. durissus that each represent species hypothesis to be tested with additional evidence. We also found support to retain C. totonacus in the Crotalus molossus species complex. We suggest conservative taxonomic changes to the complex and related species, but more evidence is needed (e.g., morphology, ecology and venom composition) to clarify relationships among species.


8.
Artículo
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Distribution of metals in tissues of captive and wild Morelet's crocodiles and the potential of metallothioneins in blood fractions as a biomarker of metal exposure
Buenfil Rojas, Asela Marisol (autora) ; Álvarez Legorreta, Teresa (autora) ; Cedeño Vázquez, J. R. (autor) ; Rendón von Osten, Jaime (autor) ; González Jáuregui, Mauricio (autor) ;
Disponible en línea
Contenido en: Chemosphere Vol. 244, 125551 (April 2020), p. 1-10 ISSN: 0045-6535
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Resumen en: Inglés |
Resumen en inglés

The distribution of Hg, Cd, Cu, and Zn in keratinized tissues, blood fractions, and excretory organs, and MTs in blood fractions and excretory organs was determined in captive, semicaptive, and wild Morelet’s crocodiles and they were compared to select the most useful non-destructive tissues for the monitoringof metal exposure and to assess the potential of MTs as a biomarker. Our results indicate blood plasma, claws, and caudal scutes altogether are suitable tissues for xenobiotic metals exposure, with concentrations in blood plasma being an indicator of recent exposure, whereas concentrations in claws and caudal scutes are indicators of chronic exposure. Results in keratinized tissues suggest they are an important detoxification strategy in crocodiles, and claws presented the highest concentrations of metals in both captive (Hg = 0.44 ± 0.23 μg g−¹, Cd = 11.10±5.89 μg g−¹, Cu = 45.98±23.18 μg g−¹, Zn = 124.75±75.84 μg g−¹) and wild populations (Hg = 1.31±0.32 μg g−¹, Cd = 26.47±21.15 μg g−¹, Cu = 191.75±165.91 μg g−¹, Zn = 265.81±90.62 μg g−¹). Thus, they are an appropriate tool for assessing metal exposure in populations where scutes clipping as a marking technique is not allowed, and their collection is less complicated than with other tissues. MTs are a suitable biomarker in blood plasma, whereas in erythrocytes detoxification processes might depend on hemoglobin, rather than MTs. Future studies should consider the implementation of these tools for the monitoring of wild populations.


9.
Artículo
Does florivory affect the attraction of floral visitors to buzz-pollinated Solanum rostratum?
Vega Polanco, Mayumi (autora) ; Rodríguez Islas, Luis Antonio (autor) ; Escalona Domenech, Raisa Yarina (autora) ; Cruz López, Leopoldo Caridad (autor) ; Rojas, Julio C. (autor) ; Solís Montero, Lislie (autora) ;
Disponible en línea
Contenido en: Arthropod-Plant Interactions Volumen 14 (2020), p. 41–56 ISSN: 1872-8847
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Resumen en: Inglés |
Resumen en inglés

Floral herbivory (florivory) can directly and indirectly affect plant reproduction through the loss of ovules or seeds and by reducing the visitation by pollinators through the reduction in flower attractiveness, respectively. We studied the effect of florivory on pollinator visitation in a buzz-pollinated herb. We used Solanum rostratum as the study model because its specialised morphology, heterantherous flowers that emit floral scents, demands a close association with its pollinators (buzzing bees). We hypothesized that when florivores consume the attractive structures (corolla and rewarding anthers), the pollinators would visit the damaged flowers less often, indirectly affecting S. rostratum reproductive success. Furthermore, we hypothesized that consumption of the reproductive structures (pollinating anther and pistil) would directly affect the plants reproductive success.

We conducted observations of three S. rostratum populations in central Mexico. We observed twelve species of florivore consuming S. rostratum flowers. Florivores preferred to consume the attractive structures (corolla) over reproductive structures. However, they preferred to consume the anthers specialised for feeding pollinators over the anthers specialised for pollination. In addition, we recorded floral volatiles emitted by flowers damaged by florivory using solid-phase microextraction coupled with gas chromatography–mass spectrometry. We identified 25 volatile compounds in S. rostratumflowers, mainly aromatic, monoterpene and sesquiterpene compounds. The relative proportions of these compounds differed between undamaged and damaged flowers. Bioassays showed that both legitimate visitors (pollinators) and illegitimate visi-tors (thieves) visited undamaged flowers more often than flowers damaged by florivores; however, the decrease in visitation frequency did not affect fruit and seed production. In conclusion, the consumption of attractive (corolla) and reward floral structures (feeding anthers) reduced the frequency of visits by pollinators but does not affect S. rostratum reproductive success (fruit and seed set) probably because reproductive structures (pistil and pollinating anthers) are less often consumed.


10.
Artículo
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Effectiveness of Panama as an intercontinental land bridge for large mammals
Meyer, Ninon France Victoire (autora) ; Moreno, Ricardo (autor) ; Sutherland, Christopher (autor) ; De la Torre, José Antonio (autor) ; Esser, Helen J. (autora) ; Jordan, Christopher A. (autor) ; Olmos, Melva (autora) ; Ortega, Josué (autor) ; Reyna Hurtado, Rafael Ángel (autor) ; Valdes, Samuel (autor) ; Jansen, Patrick A. (autor) ;
Contenido en: Conservation Biology Vol. 34, no. 1 (2020), p. 207–219 ISSN: 1434-4483
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Resumen en: Inglés |
Resumen en inglés

Habitat fragmentation is a primary driver of wildlife loss, and establishment of biological corridors is a common strategy to mitigate this problem. A flagship example is the Mesoamerican Biological Corridor (MBC), which aims to connect protected forest areas between Mexico and Panama to allow dispersal and gene flow offorest organisms. Because forests across Central America have continued to degrade, the functioning of the MBC has been questioned, but reliable estimates of species occurrence were unavailable. Large mammals are suitable indicators of forest functioning, so we assessed their conservation status across the Isthmus of Panama, the narrowest section of the MBC. We used large-scale camera-trap surveys and hierarchical multispecies occupancy models in a Bayesian framework to estimate the occupancy of 9 medium to large mammals and developed an occupancy-weighted connectivity metric to evaluate species-specific functional connectivity. White-lippedpeccary (Tayassu pecari), jaguar (Panthera onca), giant anteater (Myrmecophaga tridactyla), white-tailed deer(Odocoileus virginianus), and tapir (Tapirus bairdii) had low expected occupancy along the MBC in Panama. Puma (Puma concolor), red brocket deer (Mazama temama), ocelot (Leopardus pardalis), and collared peccary (Pecari tajacu), which are more adaptable, had higher occupancy, even in areas with low forest cover near infrastructure. However, the majority of species were subject to > 1 gap that was larger than their known dispersal distances, suggesting poor connectivity along the MBC in Panama. Based on our results, forests in Darien, Donoso–Santa Fe, and La Amistad International Park are critical for survival of large terrestrial mammals in Panama and 2 areas need restoration.