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dc.contributor.advisorZapata Anzola, Angela María
dc.contributor.advisorRivera Rondón, Carlos Alberto
dc.coverage.spatialColombiaspa
dc.creatorBustos, Marcela
dc.date.accessioned2020-03-25T17:02:51Z
dc.date.available2020-03-25T17:02:51Z
dc.date.created2018
dc.identifier.urihttp://hdl.handle.net/20.500.12010/8309
dc.description.abstractEn nueve corrientes del piedemonte de la Orinoquía colombiana se analizó el efecto de la estacionalidad climática (lluvia - sequia) y de alteraciones antrópicas (ganadería, extracción de caudal y material de lecho), sobre la composición, estructura y rasgos biológicos del ensamblaje de diatomeas. A partir del análisis de las características físicas, químicas e hidrológicas se estableció que las corrientes de menor orden o quebradas presentaron pH ácido, nutrientes y turbiedades bajas, mientras que los ríos de mayor orden tuvieron mayor carga de sólidos totales, conductividad y pH neutro. La estacionalidad determinó cambios en la composición química e hidrológica en todos los cuerpos de agua. Sin embargo, las alteraciones no determinaron cambios importantes en la caracterización física y química. La identificación taxonómica y el conteo de diatomeas se realizó a partir de láminas permanentes. La comunidad de diatomeas presentó 147 morfotipos, en las quebradas las familias representativas fueron Eunotiaceae y Diadesmidaceae, en los ríos fueron Cymbellaceae, Naviculaceae y Sellaphoraceae. Las diatomeas de las quebradas respondieron a las características fisicoquímicas del hábitat (velocidad de la corriente, materia orgánica y sulfatos) mientras que en los ríos a los nutrientes (fósforo, sílice) y pH. En la mayor parte de las corrientes la riqueza fue mayor en el periodo de sequía y no se encontraron diferencias significativas en los puntos con alteración. Los rasgos biológicos y las comunidades están en consonancia con las variables ambientales y pone de manifiesto la resiliencia de estos ecosistemas y su rápida recuperación a eventos antrópicos de baja intensidad.spa
dc.format.extent118 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.publisherUniversidad de Bogotá Jorge Tadeo Lozanospa
dc.subjectEcosistemas lóticosspa
dc.subjectEstacionalidadspa
dc.subjectAlteraciones antrópicasspa
dc.titleRespuesta de la comunidad de diatomeas y sus rasgos biológicos a diferentes alteraciones antrópicas en ambientes lóticos del piedemonte de la Orinoquía colombianaspa
dc.type.localTrabajo de grado de maestríaspa
dc.subject.lembCiencias medioambientales -- Trabajos de gradospa
dc.subject.lembConservación de los recursos naturalesspa
dc.subject.lembProtección del medio ambientespa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.type.hasversioninfo:eu-repo/semantics/acceptedVersioneng
dc.rights.localAbierto (Texto Completo)spa
dc.subject.keywordLotic ecosystemsspa
dc.identifier.repourlhttp://expeditio.utadeo.edu.coeng
dc.publisher.programMaestría en ciencias ambientalesspa
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dc.format.rda1 recurso en línea (archivo de texto)spa
dc.description.rdaRequerimientos de sistema: Adobe Acrobat Readerspa
dc.description.abstractenglishIn nine streams of the foothills of the Colombian Orinoquía, the effect of climatic seasonality (rain - drought) and anthropogenic alterations (livestock, withdrawal water and hard rock mining) on the composition, structure and biological features of the diatom assembly was analyzed. From the analysis of the physical, chemical and hydrological characteristics it was established that the lower order streams had acid pH, nutrients and low turbidity, while the higher order rivers had higher total solids load, conductivity and neutral pH. Seasonality determined changes in the chemical and hydrological composition in all bodies of water. However, the alterations did not determine important changes in the physical and chemical characterization. Taxonomic identification and diatom counts were made from permanent plates. The community of diatoms presented 147 morphotypes, in the streams the representative families were Eunotiaceae and Diadesmidaceae, in the rivers were Cymbellaceae, Naviculaceae and Sellaphoraceae. The diatoms of the streams responded to the physicochemical characteristics of the habitat (current velocity, organic matter and sulphates) while those in rivers responded to nutrients (phosphorus, silica) and pH. In most of the currents, the richness was higher in the period of drought and no significant differences were found in the points with alteration. Biological traits and communities are in line with environmental variables and show the resilience of these ecosystems and their rapid recovery to anthropic events of low intensity.spa
dc.description.degreenameMagister en Ciencias Ambientalesspa
dc.publisher.facultyFacultad de Ciencias Naturales e Ingenieríaspa
dc.identifier.instnameinstname:Universidad de Bogotá Jorge Tadeo Lozanospa
dc.identifier.reponamereponame:Repositorio Institucional de la Universidad de Bogotá Jorge Tadeo Lozanospa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa


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