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Se encontraron 8967 resultados en recursos

Por: Miguel Moreno-Palacios | Fecha: 2016

El complejo de páramos Chilí-Barragán es uno de las regiones paramunas de menor extensión en la cordillera Central de Colombia, que se encuentra principalmente sobre el departamento de Tolima. Aunque existen estudios sobre la avifauna asociada a las zonas de páramo del departamento, subsisten vacíos de información sobre este y otros complejos en la región. El objetivo de este estudio fue valuar la diversidad de aves del complejo Chilí-Barragán, a través del estudio de tres de sus páramos, examinando brevemente la dinámica de la avifauna en el gradiente de elevación. Para tal fin se realizaron muestreos en los páramos de Anaime (Cajamarca), Chilí (Roncesvalles) y Las Nieves-Estambul (Ibagué) empleando métodos como registros visuales, auditivos y redes de niebla. Se diseñó un transecto altitudinal desde 3200 – 3600 m s.n.m. con intervalos de 100 m de altura entre cada estación para cada páramo. Como resultado se registraron 89 especies de aves, que representan el 88 % - 96 % de la riqueza de aves estimada para el complejo, información que coloca a esta región paramuna entre las más diversas del país. Adicionalmente, se observó una disminución en la riqueza con el ascenso en el gradiente de elevación y se halló que la avifauna en estos tres páramos presenta una composición diferente entre las franjas altitudinales 3200-3400 m s.n.m. y 3500-3600 m s.n.m.

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

Temas:
Otros
Aves

Por: Diego Esteban Martínez-Revelo | Fecha: 2016

We report the presence of several dung beetle species (Coleoptera: Scarabaeidae: Scarabaeinae) in the Paramos located in Nariño, Colombia, based on the revision of museums specimens, field work and available literature. 210 specimens from three national museums and 362 individuals from collecting trips done by the Nariño University, GAICA Association and the authors were studied. A total of eight species from seven genera and 21 localities were listed. Uroxys elongatus Harold, 1868 is the species with most individuals collected or found in collections. Only one individual of Ontherus brevicollis Kirsch, 1871 and Oruscatus opalescens Bates, 1870 was found. The altitudinal range under study goes from 2800 to 3700 meters, corresponding to the highest altitude reported for U. elongatus, additionally we report the localities for two species, O. opalescens and Dichotomius monstrosus (Harold, 1875), with few or no confirmed data, increasing the knowledge for these species for Colombia.

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

Temas:
Otros

Por: Ana M. Gómez-Aguirre | Fecha: 2016

En este artículo se presentan los resultados de una investigación sobre el complejo de páramos Frontino-Urrao, centrando la atención en la percepción que de los servicios ecosistémicos del páramo tienen los actores con influencia en su uso y manejo. Se identificaron el agua, la explotación maderera y la minería como servicios críticos frecuentemente relacionados con la existencia de conflictos entre actores, generados por concepciones y acciones contrapuestas sobre la gestión, explotación, control y propiedad de los recursos naturales. La confrontación de intereses de explotación-usufructo por parte de pobladores y propietarios y de conservación por parte de instituciones estatales o grupos ambientales, tiene como sustento la oposición entre concepciones y discursos ya sea sobre una naturaleza caprichosa y abundante, o bien sobre una naturaleza efímera. Se concluye para este estudio de caso que las problemáticas socio-económicas se agravan cuando hay falta de presencia institucional estatal y de empresas gestoras de los recursos, cuando hay desarticulación entre las instituciones estatales al intervenir en la administración, control o gestión de los recursos, o cuando se presentan superposiciones de intereses económicos a diferentes niveles escalares en las veredas del complejo de páramos Frontino-Urrao.

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

Temas:
Otros

Por: Lain E. Pardo-Vargas | Fecha: 2016

The llanos region in eastern Colombia exhibits great biodiversity, and is being threatened by agro-industrial processes such as oil palm plantations. However, information about the mammals associated with these landscapes is very limited. We measured richness and capture frequencies of medium and large sized mammals using camera traps in an oil palm plantation and surrounding natural ecosystems, in the seasonally flooded savannas of the Department of Casanare, Colombia. We identify 16 medium to large mammals, and two species of mice, with a survey effort of 3937 camera/days. Capture frequencies varied according to the land cover type. All species were present in the gallery (riparian) forest. Nine species were also detected inside the oil palm plantation and six in savannas. The mammals we found in the plantation were mainly mesopredators and generalist species, while the mammals detected in forest have more restricted diets. We discuss the importance of the gallery forests and artificial lagoons as landscape tools that could enhance diversity in these agro-ecosystems.

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

Temas:
Otros

Por: María Fernanda Barragán F. | Fecha: 2017

Aquatic insects are important in the function of ecosystem. The objective of this study is to describe the structure and distribution of aquatic insects in four rivers which are located on three different slopes of the Sierra Nevada de Santa Marta (SNSM): Gaira, Tucurinca, Ranchería and Guatapurí. Gravel and macrophyte microhabitats were analyzed in each river with a Surber sampler, the leaf litter fauna with a triangular net, and spray zones and stones were analyzed by manual collection. 5803 individuals were registered, 39 families and 72 taxas. Guatapurí River presented the greatest abundance number (1890 individuals). The most abundant order was Ephemeroptera with 1861 individuals. Simulium presented the higher abundance (14.5 %) . The higher abundance was in the gravel 36.93 % and lowest in litter with 33.31 %. We found high abundance during the low rainfall (Guatapurí and Ranchería). Two new records were obtained, Podonomus (Chironomidae) in Guatapurí River and Stenhelmoides (Elmidae) in Ranchería River. According to the results we could conclude that the rivers of the SNSM have a high generic richness compared with the Andean Zone Rivers and other temperate zones.

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

Temas:
Otros

Por: Jaime Alberto Palacio-Baena | Fecha: 2016

The mobile macroepifauna associated to Thalassia testudinum meadow was studied in quadrants of 1m2 placed on two fringes (shallow water and deep water) of it in Triganá Bay, Gulf of Urabá, Colombia. The results showed significant differences in coverage, biomass and width of leaves of T. testudinum between fringes. A total of 879 macroinvertebrates were collected of 42 species. The most abundant species were Cerithium cf. eburneum, Nassarius vibex, Neritina virginea, Clibanarius cubensis and C. antillensis. Statistical analyzes showed no relationship between mobile fauna and meadow fringes and consequently their distribution and abundance did not depend on the structure of the prairie between fringes.

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

Temas:
Otros

Por: Hernando García Martínez | Fecha: 2017

The objective of this research was to review all scientific literature published on Colombian forests in order to learn more about knowledge gaps for a future research agenda. This study was focused on three topics 1) base line studies, 2) research on ecological dynamics and functioning of forests and 3) research with recommendations for forest management and conservation. We found 1627 published documents on Colombian forests including 1337 scientific articles, 60 book chapters, and 230 books. The most studied region was the Colombian Andes (699), with an important increase of publications during the last decade. Most of the documents are baseline studies, mainly on floristic composition. Studies on ecological dynamics and forest functioning (680) were more numerous than research on forest structure (370). 65% of the documents were open access, mainly scientific articles. In contrast, the majority of the books were not available in digital version. We found that less than 25% of the documents attempt to determine what is causing biodiversity loss. Additionally, only 102 (7.5%) of the documents provided explicit and feasible recommendations for forest management. We conclude that despite the great and growing amount of information published on Colombian forests there is still a gap between scientific research and the possibilities of implementation. This paper should become an important asset for a national research agenda that links scientific knowledge and planning exercises for a wise and integrative forest management in Colombia.

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

Temas:
Otros

Por: Luz Fernanda Jiménez-Segura | Fecha: 2016

One of the most obvious impacts of damming a river is the disruption of migratory routes, however, the characteristics of the dam, the river and its fish fauna make impossible the generalizations about the possible effects. Since the beginning of the operation of La Miel I hydropower plant, it was detected the entrance of fish into the hydropower plant (through the surge chamber) from La Miel river. To determine the composition of the fish and evaluate the potential effects on migration, for one year (April 2010-April 2011) adult individuals were tagged and released and ichthyoplankton collections were made, both in the surge chamber and in the discharge channel. Individuals of migratory and non-migratory species, mainly piscivorous and detritus-scrapers were found. Individuals who entered the surge chamber were able to find quickly the exit through the restriction orifice and returned to the main channel of La Miel River. The fish did not spawn in the central structures. We conclude that the surge chamber is not an absolute barrier to migration, but it is a staging habitat for migrant individuals.

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

Temas:
Otros

Por: Germán I. Andrade-Pérez | Fecha: 2017

Based upon the multiple dimensions of the landscape concept, and its recognition within the Colombian law system, we propose de category Protected Landscape for the National Protected Areas System. It is argued that the consideration of the protected landscape has the potential of contributing to conservation in lands in which biodiversity is linked with cultural practices, as well as to the national objective of conservation associated with the “social valuation of nature.” Several social and ecological criteria for the evaluation of potential sites as protected landscapes are thus presented, including regions and sites where they occur. A short discussion around the importance of integrating cultural and ecological values in protected areas conservation and strategies, as well as an agenda for further development and implementation, are presented.

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

Temas:
Otros

Por: Andrés Rymel Acosta Galvis | Fecha: 2016

During an exploratory field trip, made to identify possible study areas in one of the isolated paramos north of the Arcabuco region (Boyacá, Colombia), a species of terrestrial frog assignable to the unistrigatus species group of the genus Pristimantis was discovered. It is similar in morphology to the species group with reduced discs formed by Pristimantis mnionaetes, P. nervicus and P. nicefori of the Cordillera Oriental of Colombia. These species allow the recognition of 10 species of this genus associated with high mountain environments in the Eastern Cordillera of Colombia. Data on their morphology, distribution and natural history and associated anurans reported from this geographical area are presented.

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

Temas:
Otros