Saltar navegación e ir al contenido principal

Estás filtrando por

Haz seleccionado nuevos filtros para tu búsqueda. Para aplicarlos, haz clic en “Aplicar filtros”.

Se encontraron 6748 resultados en recursos de contenido

Imagen de apoyo de Registro de mortalidad de fauna silvestre por colisión vehicular en la carretera Toluviejo – ciénaga La Caimanera, Sucre, Colombia

Por: Jaime De La Ossa | Fecha: 01/01/2016

The present work evaluates the accidental mortality for collisions over wildlife and vehicles associated to the road that going from Toluviejo town to Ciénaga de la Caimanera in the department of Sucre, Colombia, crossing an important portion of Montes de María, it passes through by antropic savannas until arriving to the area of mangroves in the Caribbean coast. Were registered 431 individuals road killed: mammals 28,1 % (121), birds 28,8 % (124), reptiles 21,8 % (94) and amphibians 21,3 % (92). Specifically the species with more mortality were: Cerdocyon thous (10.9 %), Iguana iguana (10.8hj%), Crotophaga ani (9.5%), Tamandua mexicana (7.7 %) and Didelphis marsupialis (6.1 %). The rate runover was superior in all the cases, both as, in a general and as specified way when comparing it with related works. The analyzed road doesn’t present any signaling protection for the wild fauna, it lacks illumination, and it is built in its entirety in asphalt, with relative good state. The running over rate it is related to factors such as: vehicular flow, wide of the road, behavior of the species, vegetable covering and the vehicular speed, being all of great importance and wide influence in the detected road killed.

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

Temas:
Otros

Imagen de apoyo de Gestión integral de la biodiversidad en el Distrito Capital: aportes para una gobernanza urbana

Por: Germán Andrés Quimbayo Ruiz | Fecha: 01/01/2017

Based on the recognition of the geographical context and environmental institutions of Bogotá, this paper attempts to propose some insights for the comprehensive management of urban-region biodiversity, taking into account the contribution of the social and institutional history of the city. Considering this, it could support the promotion of common practices and languages in order to develop persistent processes of social appropriation of biodiversity which could become part of a broader urban policy. The document propose some principles and actions, based on the different ways of seeing and use the biodiversity in Bogotá, which it can be assumed as a public good that maintains and improves the quality of life in the city and its region.

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

Temas:
Otros

Imagen de apoyo de Estudios en Asteraceae de Colombia: primer registro del género Tragopogon L.

Por: Diego Giraldo-Cañas | Fecha: 01/01/2016

As result of recent explorations in the Andean Cordillera Oriental of Colombia, Tragopogon porrifolius L. (Asteraceae: Cichorieae) is reported for the first time for this country. This study provides ecological information, geographic distribution, photographs, and comments about the particular morphological characteristics of the new reported species.

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

Temas:
Otros

Imagen de apoyo de Diversidad, bioformas y abundancia de plantas acuáticas en humedales de las llanuras inundables del Orinoco en Venezuela

Por: Anabel Rial B. | Fecha: 01/01/2016

Richness (alpha and beta diversity), abundance and dominance of bioforms of aquatic vegetation in a wetland of the Orinoco floodplains in Venezuela, studied over an annual cycle are described. In a lowland extension of 65,000 hectares including a whole range of aquatic habitats (shallows, marshes, ponds and streams), 197 species belonging to 122 genera and 56 families were recorded. Beta diversity was higher in lentic than in lotic wetlands, the emergent rooted bioform being the most abundant in all habitats and throughout the year. Considering the most persistent species (spatially and temporally), Eichhornia crassipes (Mart) Solms., Hymenachne amplexicaulis (Rudge) Nees and Luziola subintegra Swallen obtained the highest relative importance values. The most abundant species in all environments and throughout the year was Salvinia auriculata Aubl. Brief comments on the limited use of these aquatic plants are given.

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

Temas:
Otros

Imagen de apoyo de Miconia curvitheca (Melastomataceae), una nueva especie nativa de los bosques altoandinos y subparamos de los Andes centrales, Colombia

Por: Juan Mauricio Posada-Herrera | Fecha: 01/01/2017

Miconia curvitheca (Melastomataceae) is described and the name is validated. This species is restricted to high Andean forests and subparamos and is distributed in the southern and central part of the Central Colombian Cordillera of the Andes between 2900 and 3700 m elevation from the department of Cauca to the limits of the departments of Quindío, Tolima and Valle del Cauca. It is characterized by the curved shape of its anthers and differs from the most similar species, M. cuatrecasae, by the following combination of characters: smaller leaves, always bisexual flowers and ovary always four-celled.

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

Temas:
Otros

Imagen de apoyo de Presencia del pez basa, Pangasianodon hypophthalmus (Sauvage, 1978) (Silurifotmes: Pangasiidae), en la cuenca del ríuo Magdalena, Colombia

Por: José Iván Mojica | Fecha: 01/01/2017

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

Temas:
Otros

Imagen de apoyo de Zonificación de alternativas de conectividad ecológica, restauración y conservación en las microcuencas Curubital, Mugroso, Chisacá y Regadera, cuenca del río Tunjuelo (Distrito Capital de Bogotá), Colombia

Por: Paola J. Isaacs-Cubides | Fecha: 01/01/2017

Bogotá has a wide variety of natural and impacted vegetation covers, which require conservation and restoration actions to preserve the goods and services they provide as well as their biodiversity. However, a spatial analysis is necessary to locate which areas require these actions that will also become a source of information for decision making, especially in terms of conservation and connectivity between vegetation covers. We develop three models of resistance or conductance based on the quantification of physical, biotic and socio-economic criteria, defined by meetings with experts, and available cartographic resources that includes a functional analysis based on the ecological aspects of the vegetation cover and a group of mammals. The models obtained show the best conserved areas or least resistance for species and also indicate those areas with greater degradation and higher resistance. This information facilitates the zonification of restoration activities, particularly in mountain moors and transitional Andean forests. The models also complement the proposals made in the Ecological Structure of the District report with respect to connectivity, representativeness and number of protected areas, because from the functional view and the analysis of the composition and configuration of the landscape, it provides other inputs to complement the proposed strategies.

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

Temas:
Otros

Imagen de apoyo de Contribución proteica de animales silvestres y domésticos a los menús de los contextos rurales, peri-urbanos y urbanos de varias regiones de Colombia

Por: Nathalie van Vliet | Fecha: 01/01/2016

The present study aims to generate information about the importance of eating bushmeat over other sources of animal protein - wild (fish), domestic or industrial- in four regions of Colombia, from the rural to the urban. The data of animal protein consumption of 1808 students in 23 rural, urban and peri-urban schools were analyzed. In urban and peri-urban areas, the most consumed animal proteins result from domestic or industrial (industrial chicken industrial egg and beef) origin, while in rural areas the fish ranks first. Bushmeat was consumed by 8 % of children in rural areas, 3 % of children in peri-urban areas and 2 % of children in urban areas. Large regional differences were observed in the Pacific region where bushmeat was most consumed. Our study shows that nutritional transition from rural to urban is characterized by the replacement of the wild protein consumption (fish and bushmeat), by domestic and industrial protein consumption, together with considerable loss of dietary diversity.

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

Temas:
Otros
Medicina

Imagen de apoyo de Ephemeroptera asociados a ocho afluentes de la Sierra Nevada de Santa Marta, Colombia

Por: Esteffany P. Barros-Núñez | Fecha: 01/01/2016

The Ephemeroptera are an order of insects very important in the benthic community, being bio-indicators of water quality, considering key conservation. Despite the dense hydrographic network of the Sierra Nevada de Santa Marta (SNSM), Colombia Caribbean region, knowledge of aquatic macroinvertebrates assemblage is insufficient; limnological studies have focused mostly on the Gaira River. The aim of this study was to determine the composition and structure of the order Ephemeroptera in eight basins of the SNSM. The samples were collected between October-November 2013. In situ physical and chemical parameters were measured; nutrients and microorganisms were analyzed in the laboratory. In addition, the taxonomic composition and abundance was determined; Likewise canonical correspondence analysis (CCA) with the physico-chemical and microbiological biological parameters was performed. 1924 individuals distributed in five families and 12 genera were collected. The most abundant taxa were Leptohyphes (25 %), Baetodes (25 %), and Prebaetodes (9 %). According to the CCA, the temperature was the variable that best explained the variance of the presence of taxa. The basins of the SNSM remain important reservoirs of diversity of aquatic organisms. The results are a contribution to the knowledge of the order Ephemeroptera.

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

Temas:
Otros

Imagen de apoyo de Diversidad y biomasa de macroinvertebrados asociados a cuatro tipos de sustratos en la laguna La Virginia, páramo Sumapaz

Por: Claudia Salazar | Fecha: 01/01/2016

Para el establecimiento y el desarrollo de los macroinvertebrados en los sistemas leníticos es importante que los sustratos disponibles sean variados. Así, la biomas de los taxones es un reflejo de la producción del sistema. Este estudio evaluó la diversidad en cuatro sustratos: macrófita (Myriophyllum aquaticum), roca, sedimentos y materia orgánica, y se analizó la variación temporal de la biomasa y la abundancia con base en tres períodos hidrológicos. Se colectaron 2.957 individuos (17 géneros, 11 órdenes). Helobdella fue el taxón dominante aportando 90 % a la biomasa total de la comunidad, seguido de Hyalella, Tanytarsus y Centrocorisa. La conductividad, los sulfatos y la temperatura hídrica fueron determinantes para la biomasa. En la macrófita se encontró menor diversidad de H’ (0,03 nats.ind-1) y mayor dominancia (0,99); en el resto de sustratos la diversidad fue mayor (X = 1,5) y la dominancia menor (X = 0,24). Se encontraron diferencias significativas en los registros de biomasa entre sustratos más no entre campañas. En conclusión, el sustrato macrófita es el hábitat más utilizado por los macroinvertebrados pues alberga mayor cantidad de individuos; sin embargo, no presenta la mayor diversidad, a diferencia de los otros tres sustratos que evidencian mayor diversidad de taxones.

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

Temas:
Otros