Saltar navegación e ir al contenido principal

Estás filtrando por

Se encontraron 12370 resultados en recursos

Por: Rocío Peña Cañón | Fecha: 2019

Basidioma de Ganoderma

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt

Temas:
Otros

Por: José Rancés Caicedo Portilla | Fecha: 2020

Se documenta la presencia del geco casero común Hemidactylus frenatus en la ciudad de Leticia, Colombia. La especie posiblemente ingresó a esta región por vías aéreas o fluviales. Se registra a Hemidactylus frenatus y H. mabouia coexistiendo en un punto del centro de la ciudad, donde H. frenatus parece estar desplazando a H. mabouia. Posiblemente, la especie se seguirá dispersando a otros centros poblados de la cuenca amazónica y podría, entrar a Brasil. H. frenatus podría llegar a dispersarse a hábitats naturales, como ha sucedido en otras regiones del mundo, lo cual sería desfavorable para las poblaciones de gecos y otros lagartos pequeños nativos de la Amazonia. Se deben realizar monitoreos constantes en Leticia para entender y rastrear los patrones de dispersión de esta especie en la cuenca amazónica.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt

Temas:
Otros

Por: Luz Fernanda Jiménez-Segura | Fecha: 2016

The Magdalena-Cauca River basin has 213 species of freshwater fish, of which slightly more than 50% are endemic. This basin accounts for 80% of the Colombian population, holds 80% of the national GDP and within its channels are located the 84% of the hydroelectric plants that supply energy to Colombia. The Andean mountains generate altitudinal gradients in aquatic systems as well as its associated biota along the Magdalena-Cauca basin. To analyze the interaction between the altitudinal gradient in the distribution of species of freshwater fish and the location of existing reservoirs, it was performed an analysis of the altitudinal distribution of endemic and migratory fish species and their implications for their conservation based on the current and future state in the formation of reservoirs, using a review of case studies at global and national levels. It was found that the number of species is inversely proportional to altitude, while the endemics are directly proportional and reservoirs below 700 m altitude affect the conservation status of migratory species. A reservoir creates new species richness gradients and modifies the channels that are used by migratory species as spawning areas. We conclude that the development of the hydropower based on the use of water in the Andean rivers and another activities associated with economic development of Colombian society, has led to changes in freshwater aquatic systems in the Magdalena-Cauca basin, influences in the structure of the assemblages of species of fish and in the dynamic of migration and spawning of freshwater fish species important for artisanal fisheries.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt Formatos de contenido: Artículos

Temas:
Otros

Por: Luis Germán Naranjo | Fecha: 2019

Durante la última década se ha incrementado la producción de información climática para la toma de decisiones en conservación y manejo de la biodiversidad, tanto en Colombia como en países vecinos. Buscando promover la adaptación y aumentar la resiliencia de paisajes estratégicos frente al clima y sus cambios, WWF y sus socios han sido parte de este progreso. En este trabajo, presentamos siete experiencias ilustrativas de estos avances, con el objetivo de dar a conocer los métodos y resultados más relevantes, demostrar el carácter de las alianzas interinstitucionales, las lecciones aprendidas y evidenciar las barreras halladas en la realización de distintos tipos de análisis, tales como la estimación del cambio futuro en temperatura y precipitación, el uso de herramientas para la modelación hidrológica, la aplicación de ejercicios de planeación sistemática de la conservación, la estimación del cambio en la clasificación climática de ecosistemas estratégicos con el uso de las Zonas de Vida de Holdridge o Caldas Lang y la creación de análisis basados en la percepción e información científica como ARCA y CAMPA, entre otros.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt

Temas:
Otros

Por: Estephania Martínez-Aguirre | Fecha: 2018

El río Mira nace en Ecuador y desemboca en el Océano Pacífico en territorio colombiano. Su ictiofauna había sido muy poco estudiada y los registros disponibles indicaban una muy baja riqueza de especies. El aumento en el esfuerzo de muestreo a nivel temporal y espacial a lo largo de la cuenca del Mira en comparación con inventarios pasados, permitió incrementar el conocimiento de las especies de este río. Se reporta aquí la diversidad íctica regional encontrada en seis expediciones de campo realizadas entre 2009 y 2016, se documentan 39 especies, 29 dulceacuícolas nativas, una introducida y nueve de origen marino que remontan la cuenca baja; el material recolectado se encuentra depositado en la Colección de Peces del Instituto de Ciencias Naturales de la Universidad Nacional de Colombia (MHN-ICN). Las actividades antrópicas que se desarrollan en la cuenca, principalmente la tala de bosques nativos y los monocultivos (lícitos e ilícitos), implican a una severa alteración del hábitat, que pone en riesgo esta diversidad biológica.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt

Temas:
Otros

Por: Alcides A. Mondragón-Izquierdo | Fecha: 2016

A total of 6634 vascular plant specimens deposited in the UCOB Herbarium from Lara state until 2014 were reviewed in order to improve our knowledge about the flora. The most prominent collectors are Robert Smith, Hipólito Alvarado, Bolivia Mediomundo, Charles Burandt Jr., José Antonio Casadiego and Alcides Mondragón. 1659 species were recorded in 859 genera and 155 botanical families, accounting for 64.7% of the families, 36.5% of the genera and 11.3% of the Angiosperm species occurring in the country. Families with higher numbers of species were: Leguminosae (181), Poaceae (166), Asteraceae (125), Rubiaceae (95), Euphorbiaceae (65)and Malvaceae (54). Genera with higher numbers of species were: Paspalum (22), Miconia (20), Cyperus (19), Solanum (18), Piper (16), Senna (15) and Tillandsia (14). Of the total species, 308 are new records and four are endemic to Lara state. The most explored regions are: Serranía de Portuguesa, Serranía de Barbacoas, Serranía de Bobare and gallery forest of the Tocuyo River Basin. The most explored county was Morán (26.7 %), followed by Palavecino (18.8 %) and Iribarren (15,6 %), the least explored were Jiménez (3.7 %) and Torres (4.9 %) municipalities.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt Formatos de contenido: Artículos

Temas:
Otros

Por: Viviana Vidal-Astudillo | Fecha: 2016

The dry enclave of Amaime River is one of the few places that remain as Tropical Dry Forest in the Valle del Cauca department, which is considered one of the most threatened ecosystems in the Neotropics. The site has been heavily transformed and threatened by anthropic means like continued burning for the suitability of land for agriculture and livestock, small short rotation crops among others. The aim of the study was to develop detailed inventories of avifauna, herpetofauna, mammalian fauna, and flora in relict sub-xerophytic forests of the enclave, therefore revealing the biodiversity of these remnants, their conservation status and potential threats in order to propose recommendations for conservation. Four sampling areas were selected with cover vegetation as thorny scrub vegetation, riparian forests and forest fragments. For registration and data collection mist nets, transects, direct observations and Sherman traps were used, additionally informal interviews with the community were performed. Despite the reduction of vegetation cover in the dry enclave of Amaime River, the forest fragments serve as shelter and feeding site for both transient species and typical dry and very dry forest wildlife.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt Formatos de contenido: Artículos

Temas:
Vegetación
Otros
Zoología
Aves

Por: Juan David Amaya-Espinel | Fecha: 2017

The quantification and classification of the risk of extinction for a species within a country or region and the publication of red list are fundamental tools for preventing and managing the loss of biodiversity on a sub-global scale of anthropogenic activity. Colombia may be considered a regional leader in the development of this type of risk analysis (i.e. red books published in 2002 and recent re evaluations of birds and freshwater fish); however, there are many challenges to increasing taxonomic coverage, periodic assessments, sustainability and also the influence on conservation planning and management in Colombia. This working paper presents a proposal to create, implement and consolidate an -Operative System for Risk Extinction Analysis and Monitoring of the Colombian Wildlife to address more effectively the challenges outlined above. It originates from research that identified progress and gaps on this issue in Colombia in relation to other countries of the world and also from discussions and recommendations by South America fauna experts. Based on these elements, the proposal presents objectives, guidelines, instances, roles, activities and work schemes that should be considered relevant to increase the rigor, transparency, periodicity, sustainability and impact of the wildlife risk assessments in Colombia. The system here presented is preliminary and should be amply consulted and discussed in order to make the necessary adjustments to obtain a definite working model for Colombia.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt Formatos de contenido: Artículos

Temas:
Otros

Por: Agustín Rudas-Ll. | Fecha: 2016

Potential areas of distribution of the common cattle tick Rhipicephalus (Boophilus) microplus in the Altiplano Cundiboyacense are presented, using two algorithms of ecological niche modeling (Maxent and Classification Trees). The algorithms were complementary, with excellent and significant returns, registering AUC (0.70 and 0.90 Maxent Classification Trees), and low values of omission errors (0.00% and 4.6% Maxent Classification Trees). The landscape along with the presence of the host, altitude, precipitation, temperature and humidity of the first wet quarter, were the most important variables in modeling. The north-eastern region of the Altiplano has the best potential for the establishment of this species.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt Formatos de contenido: Artículos

Temas:
Otros

Por: Arturo González-Alvarado | Fecha: 2016

The species list of dung beetles of the dry forest of Colombia from the Entomological Collection of the Alexander von Humboldt Institute is presented. A total of 19.797 specimens of 68 species, the largest number of species registered for different localities in dry forest in Colombia, were reviewed. The taxonomic problems within the subfamily Scarabaeinae in Colombia are discussed; and a unique code for each morpho-species is proposed to further the the standardization of identification for records that cannot be identified to species. Only 35 species (51 %) could be identified to species, the others were codified.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt Formatos de contenido: Artículos

Temas:
Otros