Limnology and water quality in La Plata basin (South America) – Spatial patterns and major stressors

The La Plata Basin (LPB) is a continental river-system, extending across five countries in South America. The study intended to discriminate limnological and water quality macroscale patterns and the determinants. Samplings were performed at 44 points, including free-flowing river stretches and rese...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Marcos G. Nogueira, Gilmar Perbiche-Neves, Danilo de Oliveira Naliato, Silvia M. Caglierani Casanova, José Roberto Debastiani-Júnior, Evaldo G. Espíndola
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Free-flowing river stretches Reservoirs Paraná River Paraguay River Uruguay River Transboundary rivers Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/24852892189348ca9ee54e84edee0183
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:24852892189348ca9ee54e84edee0183
record_format	dspace
spelling	oai:doaj.org-article:24852892189348ca9ee54e84edee01832021-12-01T04:31:08ZLimnology and water quality in La Plata basin (South America) – Spatial patterns and major stressors1470-160X10.1016/j.ecolind.2020.106968https://doaj.org/article/24852892189348ca9ee54e84edee01832021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20309079https://doaj.org/toc/1470-160XThe La Plata Basin (LPB) is a continental river-system, extending across five countries in South America. The study intended to discriminate limnological and water quality macroscale patterns and the determinants. Samplings were performed at 44 points, including free-flowing river stretches and reservoirs, distributed along 3000 km, from tropical (18°S) to subtropical/temperate (33°S) latitudes, in summer and winter. In situ measurements and sample analyses included the water column (13 variables) and sediments (granulometry, nutrients, 36 pesticides, 13 metals, and bioassays for acute and chronic toxicity). Both natural factors – climate gradient, geological substrate, soil, floodplains, and human interference – river damming, metropolitan areas, and intensive agriculture, strongly influenced the results. Seasonality effects were pronounced in south of the LPB, associated with higher temperature amplitude, and in north of the LPB, in terms of marked precipitation distribution. Data sets were ordinated through principal component analyses, and spatial patterns were clearly evidenced. River impoundments determined higher deepness and transparency, lower temperature amplitude, and thermal and chemical stratification. Reservoir sediments presented higher organic matter and metal concentrations, fine sand, and silt. Higher natural turbidity, suspended matter and coarse sand sediments characterized the shallower free-flowing stretches, especially in the undammed Paraguay River. Recovery of the riverine conditions (Paraná and Uruguay Rivers) occurs with distance from dams due to the river’s long courses. The variables indicating trophic conditions (phosphorus and nitrogen) were not clearly ordinated, but positioning of the most eutrophic LPB reservoir, under the influence of the São Paulo metropolis, was distinctive due to remarkably high chlorophyll a concentrations. Nutrients and conductivity were influenced by northern summer rains and tended to increase downstream, towards south latitudes. These variables were also locally influenced by urban agglomerations and by vast areas managed for commercial farming. Contamination with pesticides is widespread in LPB, but with higher incidence in the upper Paraná and middle Uruguay sub-basins. The same trend occurred for toxicity. A better understanding of macroscale processes brings a new perspective to transcend from local to a transboundary water management in the LPB.Marcos G. NogueiraGilmar Perbiche-NevesDanilo de Oliveira NaliatoSilvia M. Caglierani CasanovaJosé Roberto Debastiani-JúniorEvaldo G. EspíndolaElsevierarticleFree-flowing river stretchesReservoirsParaná RiverParaguay RiverUruguay RiverTransboundary riversEcologyQH540-549.5ENEcological Indicators, Vol 120, Iss , Pp 106968- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Free-flowing river stretches Reservoirs Paraná River Paraguay River Uruguay River Transboundary rivers Ecology QH540-549.5
spellingShingle	Free-flowing river stretches Reservoirs Paraná River Paraguay River Uruguay River Transboundary rivers Ecology QH540-549.5 Marcos G. Nogueira Gilmar Perbiche-Neves Danilo de Oliveira Naliato Silvia M. Caglierani Casanova José Roberto Debastiani-Júnior Evaldo G. Espíndola Limnology and water quality in La Plata basin (South America) – Spatial patterns and major stressors
description	The La Plata Basin (LPB) is a continental river-system, extending across five countries in South America. The study intended to discriminate limnological and water quality macroscale patterns and the determinants. Samplings were performed at 44 points, including free-flowing river stretches and reservoirs, distributed along 3000 km, from tropical (18°S) to subtropical/temperate (33°S) latitudes, in summer and winter. In situ measurements and sample analyses included the water column (13 variables) and sediments (granulometry, nutrients, 36 pesticides, 13 metals, and bioassays for acute and chronic toxicity). Both natural factors – climate gradient, geological substrate, soil, floodplains, and human interference – river damming, metropolitan areas, and intensive agriculture, strongly influenced the results. Seasonality effects were pronounced in south of the LPB, associated with higher temperature amplitude, and in north of the LPB, in terms of marked precipitation distribution. Data sets were ordinated through principal component analyses, and spatial patterns were clearly evidenced. River impoundments determined higher deepness and transparency, lower temperature amplitude, and thermal and chemical stratification. Reservoir sediments presented higher organic matter and metal concentrations, fine sand, and silt. Higher natural turbidity, suspended matter and coarse sand sediments characterized the shallower free-flowing stretches, especially in the undammed Paraguay River. Recovery of the riverine conditions (Paraná and Uruguay Rivers) occurs with distance from dams due to the river’s long courses. The variables indicating trophic conditions (phosphorus and nitrogen) were not clearly ordinated, but positioning of the most eutrophic LPB reservoir, under the influence of the São Paulo metropolis, was distinctive due to remarkably high chlorophyll a concentrations. Nutrients and conductivity were influenced by northern summer rains and tended to increase downstream, towards south latitudes. These variables were also locally influenced by urban agglomerations and by vast areas managed for commercial farming. Contamination with pesticides is widespread in LPB, but with higher incidence in the upper Paraná and middle Uruguay sub-basins. The same trend occurred for toxicity. A better understanding of macroscale processes brings a new perspective to transcend from local to a transboundary water management in the LPB.
format	article
author	Marcos G. Nogueira Gilmar Perbiche-Neves Danilo de Oliveira Naliato Silvia M. Caglierani Casanova José Roberto Debastiani-Júnior Evaldo G. Espíndola
author_facet	Marcos G. Nogueira Gilmar Perbiche-Neves Danilo de Oliveira Naliato Silvia M. Caglierani Casanova José Roberto Debastiani-Júnior Evaldo G. Espíndola
author_sort	Marcos G. Nogueira
title	Limnology and water quality in La Plata basin (South America) – Spatial patterns and major stressors
title_short	Limnology and water quality in La Plata basin (South America) – Spatial patterns and major stressors
title_full	Limnology and water quality in La Plata basin (South America) – Spatial patterns and major stressors
title_fullStr	Limnology and water quality in La Plata basin (South America) – Spatial patterns and major stressors
title_full_unstemmed	Limnology and water quality in La Plata basin (South America) – Spatial patterns and major stressors
title_sort	limnology and water quality in la plata basin (south america) – spatial patterns and major stressors
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/24852892189348ca9ee54e84edee0183
work_keys_str_mv	AT marcosgnogueira limnologyandwaterqualityinlaplatabasinsouthamericaspatialpatternsandmajorstressors AT gilmarperbicheneves limnologyandwaterqualityinlaplatabasinsouthamericaspatialpatternsandmajorstressors AT danilodeoliveiranaliato limnologyandwaterqualityinlaplatabasinsouthamericaspatialpatternsandmajorstressors AT silviamcaglieranicasanova limnologyandwaterqualityinlaplatabasinsouthamericaspatialpatternsandmajorstressors AT joserobertodebastianijunior limnologyandwaterqualityinlaplatabasinsouthamericaspatialpatternsandmajorstressors AT evaldogespindola limnologyandwaterqualityinlaplatabasinsouthamericaspatialpatternsandmajorstressors
_version_	1718405831372832768

Limnology and water quality in La Plata basin (South America) – Spatial patterns and major stressors

Ejemplares similares