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dc.rights.licenseAtribución-NoComercial 4.0 Internacional
dc.contributor.authorfernandez, luis
dc.date.accessioned2019-06-25T22:33:54Z
dc.date.available2019-06-25T22:33:54Z
dc.date.issued2010
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/24017
dc.description.abstractThe relationships between fish assemblage structure and environmental variables along a pollution gradient in the Medina River were analyzed over a year in four sampling sites (S1-S4). The river flows in a mountain-plain transition and is affected by several small town wastewater and sugar cane industries effluents. Environmental variables were divided in two sets, hereafter named “pollution� and “natural�. The first set included water quality variables modified by anthropic activities such as D.O., C.O.D, and dissolved ion concentrations. Natural variables included altitude, position, and time of the year. The upstream site (S1) had the lowest species richness and CPUE; but the number of species and density increased downriver (S2-S3). S1 was inhabited by invertivore species (Trichomycterus corduvensis), having low tolerance to environmental conditions and high D.O. requirements. S4 sustained the most tolerant and abundant species (Otocinclus vittatus, Corydoras paleatus), enduring the lowest D.O. and the highest C.O.D. A significant Canonical Correspondence Analysis for natural variables showed a gradient of species composition related to altitude and discharge. Water quality degradation by sugar cane factories and urban development, coupled with natural climatic, topographic and hydrological factors explained a significant amount of spatial and temporal variation in fish community structure (@48%). Natural and pollution variables shared about 15% of total variance. However, pollution variables were not significant after partialling- out the effects of natural variables, but natural variability remained significant after removal of pollution effects. The results suggest that effects of pollution may be just the result of ordination of fish communities along natural spatial and temporal gradients that are positively correlated to pollution gradients.
dc.format.mimetypeapplication/pdf
dc.language.isospa
dc.publisherUniversidad Nacional de Colombia, Facultad de Ciencias, Departamento de Biología
dc.relationhttp://revistas.unal.edu.co/index.php/actabiol/article/view/9545
dc.relation.ispartofUniversidad Nacional de Colombia Revistas electrónicas UN Acta Biológica Colombiana
dc.relation.ispartofActa Biológica Colombiana
dc.relation.ispartofseriesActa Biológica Colombiana; Vol. 15, núm. 2 (2010); 79-100 Acta Biológica Colombiana; Vol. 15, núm. 2 (2010); 79-100 1900-1649 0120-548X
dc.rightsDerechos reservados - Universidad Nacional de Colombia
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.titleAn assessment of fish communities along a piedmont river receiving organic pollution (aconquija mountains, argentina)
dc.typeArtículo de revista
dc.type.driverinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.eprintshttp://bdigital.unal.edu.co/15054/
dc.identifier.eprintshttp://bdigital.unal.edu.co/15054/2/
dc.relation.referencesfernandez, luis (2010) An assessment of fish communities along a piedmont river receiving organic pollution (aconquija mountains, argentina). Acta Biológica Colombiana; Vol. 15, núm. 2 (2010); 79-100 Acta Biológica Colombiana; Vol. 15, núm. 2 (2010); 79-100 1900-1649 0120-548X .
dc.rights.accessrightsinfo:eu-repo/semantics/openAccess
dc.subject.proposalCiencias Biologicas
dc.subject.proposalZoologia
dc.subject.proposalpolucion organica
dc.subject.proposalgradiente
dc.subject.proposalfactores ambientales
dc.type.coarhttp://purl.org/coar/resource_type/c_6501
dc.type.coarversionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.contentText
dc.type.redcolhttp://purl.org/redcol/resource_type/ART
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2


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Atribución-NoComercial 4.0 InternacionalThis work is licensed under a Creative Commons Reconocimiento-NoComercial 4.0.This document has been deposited by the author (s) under the following certificate of deposit