Saltar navegación e ir al contenido principal

Estás filtrando por

Se encontraron 12370 resultados en recursos

Por: Héctor E. Ramírez-Chaves | Fecha: 2017

En Colombia se desconocen registros del trasplante de peces de la familia Loricariidae en los diferentes sistemas dulceacuícolas. El presente trabajo describe la historia del trasplante en la cuenca alta del río Patía que drena al Pacífico, del loricárido Pterygoplichthys undecimalis que se distribuye naturalmente en diferentes ríos que drenan a la vertiente del Caribe de Colombia. Las observaciones realizadas indican que la especie se ha establecido exitosamente en diferentes afluentes del río Patía, con los primeros registros en el año 2006 y los más recientes en el 2016.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt

Temas:
Otros

Por: Andrés Aponte-Gutiérrez | Fecha: 2017

From December 2012 and January 2013 a survey of the herpetofauna diversity was made in forest remnants, farms, open areas, and vegetation around wetlands at a locality in the middle Magdalena River valley, department of Antioquia, Colombia. We recorded 27 amphibian and 36 reptile species. Three of the amphibian species are endemic to Colombia and one is considered threatened; one of the reptile species is endemic to Colombia, and three are categorized as threatened. The species diversity of amphibians and reptiles did not differ significantly between forest and farming areas, but it was higher than in open areas and vegetation associated with wetlands. The species turnover between these two groups of vegetation coverages was higher in amphibians than in reptiles. This differential species turnover level suggests that forest amphibians are more susceptible than the reptiles to deforestation, possibly due to their high dependence of moist microhabitats. Since most forests in the Middle Magdalena River valley of Colombia have been deforested, the conservation of forest remnants that still persist is a priority.

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

Temas:
Otros

Por: Jairo Solorza-Bejarano | Fecha: 2017

The seed density of Ulex europaeus was established on borders of invasive scrub thickets to the south of the Eastern Hills of Bogota. Through the direct counting method, seed abundance was established at six sampling points in an altitudinal gradient between 2,300 and 3,200 meters altitude, and for four soil depth ranges of 0 to 20 cm. Variable seed densities were established for the six sampling points between 109 and 3.384 seeds m-2. With regard to depth, the highest seed density was in the range of 0 to 5 cm for all sites sampled. Among the sampling points, significant differences were found in the number of seeds at different altitudes (p = 0.4159) and depth ranges evaluated (p=0.3919). There is a high potential at the edges of scrub for the extension of the invaded areas, by activation of the seed bank of the invasive species, suggesting the need for a priority strategy for the control of these border areas in the framework of ecological restoration processes in high Andean ecosystems.

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

Temas:
Otros

Por: Johana Edith Zuluaga-Bonilla | Fecha: 2017

Lake Tota is at 3015 m a.s.l in the eastern Andean cordillera of Colombia. It was declared an Important Bird area - IBA, because it is a strategic breeding area for endemic and threatened species and for its large concentration of resident and migratory waterfowl species. This publication provides a current list of birds, based on direct observations reported by authors from 2003 to 2016. These records were analyzed and compared with historical published data, we present an analysis of five conservation priority species and point out the need for citizen participation to create a civic movement calling attention to the importance of this aquatic ecosystem to the environmental government agencies negative ecological impacts that have been afflicting this aquatic ecosystem for more than 60 years ago, and to insist that it be designated as a RAMSAR site.

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

Temas:
Aves
Otros

Por: Lina M. Mesa S. | Fecha: 2017

Se amplía la distribución de Microgenys minuta (Characiformes, Characidae) desde la sección medio-alta del río Cauca y el tramo alto del río Magdalena hasta la porción media de la cuenca del río Magdalena, con base en ejemplares colectados en el piedemonte del departamento de Santander, Colombia.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt

Temas:
Otros

Por: Mónica A. Morales-Betancourt | Fecha: 2019

Se registra por primera vez para Colombia (cuenca del Orinoco), cuatro especies de crustáceos ectoparásitos en rayas de agua dulce (Potamotrygonidae), género Potamotrygon. Dos que pertenecen a la subclase Branchiura, familia Argulidae: Dolops reperta (Bouvier, 1899) y D. striata (Bouvier, 1899) y dos al orden Isopoda, correspondientes a las familias Cymothoidae y Corallanidae, representadas con las especies Braga cigarra (Szidat & Schubart, 1960) y Excorallana delaneyi (Stone & Heard, 1989), respectivamente.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt

Temas:
Otros

Por: Felipe Vivallo | Fecha: 2019

Se presenta una sinopsis de las especies de Centris (Ptilotopus) presentes en Colombia como una contribución al conocimiento de las abejas silvestres del país. Encontramos siete especies: C. americana, C. denudans, C. derasa, C. dimidiata, C. erythrosara, C. nobilis y C. superba. Se presentan caracteres morfológicos, nuevos registros de dis-tribución y una clave taxonómica para la identificación de ambos sexos de las especies.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt

Temas:
Otros

Por: Edison Gabriel Mejía Valenzuela | Fecha: 2020

El leucismo es un desorden hipopigmentario congénito que ha sido descrito en varias especies de mamíferos silvestres, como una condición anormal e inusual. Se presenta el primer registro de Dasyprocta fuliginosa con leucismo y se discuten las posibles causas de esta condición.

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt

Temas:
Otros

Por: Héctor E. Ramírez-Chaves | Fecha: 2017

Volumen 18 Número 1 de la revista Biota Colombiana

Fuente: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt

Temas:
Otros
Zoología
Derecho

Por: Carlos A. Lasso | Fecha: 2016

To evaluate the impacts of water flow restriction and regulation caused by the construction of a dike across Manamo Channel, variations in the benthic fish communities were studied in the mouths of three streams (Pedernales, Angostura and Manamo) of the Orinoco River Delta and one stream (Venado) that flows directly into the Gulf of Paria, during one (annual) hydrological cycle. Fishes were sampled with a shrimp trawl net. Of the 78 species collected, five were resident, 12 temporary and 62 occasional. Juvenile phases of all species were collected. Species with greater IVI values were Cathorops sp., Achirus achirus, Stellifer naso and Colomesus psittacus. No significant differences were obtained for the physical and chemical habitat parameters measured: depth, salinity and transparency, nor in the water levels of the streams even in different hydro-phases of the year. Salinity never dropped to zero and no changes in fish species composition were detected. These results lead us to hypothesize that the impacts of the dike constructed in Manamo Channel also extend to other streams of the Orinoco River Delta and even the one studied (Venado) that empties into the Gulf of Paria, where estuarine conditions prevailed during the entire study period of one year, with no observed changed in the hydrological regimen.

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

Temas:
Otros