Eutrophication of reservoirs in venezuela : relationships between nitrogen, phosphorus and phytoplankton biomass

Venezuela has more than 110 oerating reservoirs. However, limnological information is only available for about 20 percent, despite the fact that several of them are subject to negative impacts (eutrophication) caused by anthropogenic activities in their drainage basins. We analyzed the relationships...

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Autores principales: González, E. J., Quirós, R.
Formato: article Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2011
Materias:
EUTROPHICATION
NO 3:NH 4RATIO
PHYTOPLANKTON BIOMASS
TN:TP RATIO
VENEZUELAN RESERVOIRS
CYANOBACTERIA
Acceso en línea:http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2011Gonzalez2
Aporte de:
FAUBA Digital - Facultad de Agronomía (UBA) de Universidad de Buenos Aires
id snrd:2011Gonzalez2
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spelling snrd:2011Gonzalez22021-10-15T16:56:07Z González, E. J. Quirós, R. 2011 Venezuela has more than 110 oerating reservoirs. However, limnological information is only available for about 20 percent, despite the fact that several of them are subject to negative impacts (eutrophication) caused by anthropogenic activities in their drainage basins. We analyzed the relationships between nutrients and phytoplankton biomass (as chlorophyll a). A total of 14 reservoirs from the north-central and northeastern regions of Venezuela were assessed. The reservoirs showed different degrees of eutrophication, with the most enriched located in unprotected drainage basins. The systems could be separated according to low (less than 20ug/l) and high (grather than 20ug/l) total phosphorus concentrations. Furthermore, in reservoirs with low NO 3:NH 4 ratios, Cyanobacteria were dominant, whereas other phytoplankton groups were dominant in high NO 3:NH 4 ratios. Our results showed a significant linear relationship between chlorophyll a concentrations and nutrients, phosphorus and nitrogen. This is because both nutrients can be limiting for phytoplankton growth, at least in some systems. Following these results, we suggest that the control or mitigation of eutrophication in Venezuelan reservoirs should be based on an improved management of the drainage basins, rather than simply that of the reservoirs themselves. application/pdf 10.4257/oeco.2011.1503.03 2177-6199 http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2011Gonzalez2 eng info:eu-repo/semantics/openAccess openAccess http://ri.agro.uba.ar/greenstone3/library/page/biblioteca#section4 Oecologia Australis Vol.15, no.3 458-475 https://revistas.ufrj.br/index.php/oa/index EUTROPHICATION NO 3:NH 4RATIO PHYTOPLANKTON BIOMASS TN:TP RATIO VENEZUELAN RESERVOIRS CYANOBACTERIA Eutrophication of reservoirs in venezuela : relationships between nitrogen, phosphorus and phytoplankton biomass article info:eu-repo/semantics/article info:ar-repo/semantics/artículo publishedVersion info:eu-repo/semantics/publishedVersion
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-140
collection FAUBA Digital - Facultad de Agronomía (UBA)
language Inglés
orig_language_str_mv eng
topic EUTROPHICATION
NO 3:NH 4RATIO
PHYTOPLANKTON BIOMASS
TN:TP RATIO
VENEZUELAN RESERVOIRS
CYANOBACTERIA
spellingShingle EUTROPHICATION
NO 3:NH 4RATIO
PHYTOPLANKTON BIOMASS
TN:TP RATIO
VENEZUELAN RESERVOIRS
CYANOBACTERIA
González, E. J.
Quirós, R.
Eutrophication of reservoirs in venezuela : relationships between nitrogen, phosphorus and phytoplankton biomass
topic_facet EUTROPHICATION
NO 3:NH 4RATIO
PHYTOPLANKTON BIOMASS
TN:TP RATIO
VENEZUELAN RESERVOIRS
CYANOBACTERIA
description Venezuela has more than 110 oerating reservoirs. However, limnological information is only available for about 20 percent, despite the fact that several of them are subject to negative impacts (eutrophication) caused by anthropogenic activities in their drainage basins. We analyzed the relationships between nutrients and phytoplankton biomass (as chlorophyll a). A total of 14 reservoirs from the north-central and northeastern regions of Venezuela were assessed. The reservoirs showed different degrees of eutrophication, with the most enriched located in unprotected drainage basins. The systems could be separated according to low (less than 20ug/l) and high (grather than 20ug/l) total phosphorus concentrations. Furthermore, in reservoirs with low NO 3:NH 4 ratios, Cyanobacteria were dominant, whereas other phytoplankton groups were dominant in high NO 3:NH 4 ratios. Our results showed a significant linear relationship between chlorophyll a concentrations and nutrients, phosphorus and nitrogen. This is because both nutrients can be limiting for phytoplankton growth, at least in some systems. Following these results, we suggest that the control or mitigation of eutrophication in Venezuelan reservoirs should be based on an improved management of the drainage basins, rather than simply that of the reservoirs themselves.
format article
Artículo
Artículo
publishedVersion
publishedVersion
author González, E. J.
Quirós, R.
author_facet González, E. J.
Quirós, R.
author_sort González, E. J.
title Eutrophication of reservoirs in venezuela : relationships between nitrogen, phosphorus and phytoplankton biomass
title_short Eutrophication of reservoirs in venezuela : relationships between nitrogen, phosphorus and phytoplankton biomass
title_full Eutrophication of reservoirs in venezuela : relationships between nitrogen, phosphorus and phytoplankton biomass
title_fullStr Eutrophication of reservoirs in venezuela : relationships between nitrogen, phosphorus and phytoplankton biomass
title_full_unstemmed Eutrophication of reservoirs in venezuela : relationships between nitrogen, phosphorus and phytoplankton biomass
title_sort eutrophication of reservoirs in venezuela : relationships between nitrogen, phosphorus and phytoplankton biomass
publishDate 2011
url http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2011Gonzalez2
work_keys_str_mv AT gonzalezej eutrophicationofreservoirsinvenezuelarelationshipsbetweennitrogenphosphorusandphytoplanktonbiomass
AT quirosr eutrophicationofreservoirsinvenezuelarelationshipsbetweennitrogenphosphorusandphytoplanktonbiomass
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