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dc.contributor.author
Fernandez, Luis Alfredo
dc.contributor.author
Bechara, Jose Alfredo
dc.date.available
2019-05-10T18:21:17Z
dc.date.issued
2010-09
dc.identifier.citation
Fernandez, Luis Alfredo; Bechara, Jose Alfredo; An assessment of fish communities along a piedmont river receiving organic pollution (Aconquija Mountains, Argentina); Universidad Nacional de Colombia; Acta Biologica Colombiana; 15; 2; 9-2010; 1-37
dc.identifier.issn
1900-1649
dc.identifier.uri
http://hdl.handle.net/11336/76064
dc.description.abstract
The 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 “naturalâ€. 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
application/pdf
dc.language.iso
eng
dc.publisher
Universidad Nacional de Colombia
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Organic Pollution
dc.subject
River Gradients
dc.subject
Neotropical Fish
dc.subject
Canonical Analyses
dc.subject.classification
Otras Ciencias Biológicas
dc.subject.classification
Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
An assessment of fish communities along a piedmont river receiving organic pollution (Aconquija Mountains, Argentina)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-04-23T17:50:20Z
dc.journal.volume
15
dc.journal.number
2
dc.journal.pagination
1-37
dc.journal.pais
Colombia
dc.journal.ciudad
Bogota
dc.description.fil
Fil: Fernandez, Luis Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucuman. Instituto de Biodiversidad Neotropical. Universidad Nacional de Tucuman. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Instituto de Biodiversidad Neotropical. Instituto de Biodiversidad Neotropical; Argentina
dc.description.fil
Fil: Bechara, Jose Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; Argentina
dc.journal.title
Acta Biologica Colombiana
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://revistas.unal.edu.co/index.php/actabiol/article/view/9545/20517
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://dx.doi.org/10.15446/abc
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