Effects of hexavalent chromium on phytoplankton and bacterioplankton of the Río de la Plata estuary: an ex-situ assay

We examined the responses of the phytoplankton and the bacterioplankton of the freshwater zone of the Rio de la Plata estuary when exposed to an addition of hexavalent chromium (Cr⁺⁶). The planktonic community from a coastal site was exposed to a chromium increase of 80 μg L⁻¹ for 72 h in laboratory...

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Autores principales: Sathicq, María Belén, Gómez, Nora
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Ciencias Naturales
Chlorophyll-a
Pheophytin
Phytoplankton assemblage
Oxygen production
Bacterioplankton
Toxicology
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/130406
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-130406
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Chlorophyll-a
Pheophytin
Phytoplankton assemblage
Oxygen production
Bacterioplankton
Toxicology
spellingShingle Ciencias Naturales
Chlorophyll-a
Pheophytin
Phytoplankton assemblage
Oxygen production
Bacterioplankton
Toxicology
Sathicq, María Belén
Gómez, Nora
Effects of hexavalent chromium on phytoplankton and bacterioplankton of the Río de la Plata estuary: an ex-situ assay
topic_facet Ciencias Naturales
Chlorophyll-a
Pheophytin
Phytoplankton assemblage
Oxygen production
Bacterioplankton
Toxicology
description We examined the responses of the phytoplankton and the bacterioplankton of the freshwater zone of the Rio de la Plata estuary when exposed to an addition of hexavalent chromium (Cr⁺⁶). The planktonic community from a coastal site was exposed to a chromium increase of 80 μg L⁻¹ for 72 h in laboratory conditions. The results showed a decrease in the concentration of Cr⁺⁶ by 33% in the treatments, along with significant decreases in chlorophyll-a (63%), the chlorophyll-a:pheophytin-a ratio (33%), oxygen production (37%), and in the total density of the phytoplankton (15%). The relative abundance of chlorophytes and diatoms decreased, while the cyanobacteria thrived. Finally, the total bacterial density and the density of viable bacteria decreased. These results show that even small increments in Cr⁺⁶ can cause significant effects on the phytoplankton and bacterioplankton, which could potentially affect other trophic levels of the community, risking alterations of the entire ecosystem.
format Articulo
Articulo
author Sathicq, María Belén
Gómez, Nora
author_facet Sathicq, María Belén
Gómez, Nora
author_sort Sathicq, María Belén
title Effects of hexavalent chromium on phytoplankton and bacterioplankton of the Río de la Plata estuary: an ex-situ assay
title_short Effects of hexavalent chromium on phytoplankton and bacterioplankton of the Río de la Plata estuary: an ex-situ assay
title_full Effects of hexavalent chromium on phytoplankton and bacterioplankton of the Río de la Plata estuary: an ex-situ assay
title_fullStr Effects of hexavalent chromium on phytoplankton and bacterioplankton of the Río de la Plata estuary: an ex-situ assay
title_full_unstemmed Effects of hexavalent chromium on phytoplankton and bacterioplankton of the Río de la Plata estuary: an ex-situ assay
title_sort effects of hexavalent chromium on phytoplankton and bacterioplankton of the río de la plata estuary: an ex-situ assay
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/130406
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bdutipo_str Repositorios
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