Progressive changes in the structure and dynamics of the phytoplankton community along a pollution gradient in a lowland river - a multivariate approach

The phytoplankton of the River Lujan (Buenos Aires, Argentina) was studied for a period of 18 months, together with physical and chemical variables, in relation to a pollution gradient. 167 taxa were recorded within a seasonal succession characterized by dominance of diatoms with a brief summer gree...

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Autores principales:	Del Giorgio, Pablo A., Vinocur, Alicia Liliana
Publicado:	1991
Materias:	community structure lowland river multivariate analysis phytoplankton pollution water quality Argentina, Buenos Aires, Lujan River Cyclotella meneghiniana Nitzschia stagnorum
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v224_n3_p129_delGiorgio http://hdl.handle.net/20.500.12110/paper_00188158_v224_n3_p129_delGiorgio
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00188158_v224_n3_p129_delGiorgio
record_format	dspace
spelling	paper:paper_00188158_v224_n3_p129_delGiorgio2023-06-08T14:39:38Z Progressive changes in the structure and dynamics of the phytoplankton community along a pollution gradient in a lowland river - a multivariate approach Del Giorgio, Pablo A. Vinocur, Alicia Liliana community structure lowland river multivariate analysis phytoplankton pollution water quality community structure phytoplankton pollution Argentina, Buenos Aires, Lujan River Cyclotella meneghiniana Nitzschia stagnorum The phytoplankton of the River Lujan (Buenos Aires, Argentina) was studied for a period of 18 months, together with physical and chemical variables, in relation to a pollution gradient. 167 taxa were recorded within a seasonal succession characterized by dominance of diatoms with a brief summer green algae facies. A combination of several biotic indices and multivariate analysis was employed to assess the impact of pollution on the phytoplankton community. The biotic indices used were species diversity and richness, algal quotients (green algae/diatom ratio, Centrales/Pennales ratio) and the SD succession rate index. Multivariate procedures included cluster analysis and ordination by PCA of both species and samples, stepwise discriminant analysis and multiple discriminant analysis of variance (MANOVA). Results indicate that community dynamism is attenuated at the more polluted sites, concomitant with an increased predominance of a broad-tolerance algal assemblage, co-dominated by Cyclotella meneghiniana and Nitzschia stagnorum. The changes in the community structure and dynamics described herein involved alterations in the distribution and relative proportions of the algae, rather than modifications in the basic species composition. These changes may not be readily detectable by methods which over-simplify the ecological information, such as systems of indicator species and biotic indices, designed to assess the degree of pollution. The suitability of multivariate analysis and biotic indices in river phytoplankton studies is further discussed. © 1991 Kluwer Academic Publishers. Fil:del Giorgio, P.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vinocur, A.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1991 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v224_n3_p129_delGiorgio http://hdl.handle.net/20.500.12110/paper_00188158_v224_n3_p129_delGiorgio
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	community structure lowland river multivariate analysis phytoplankton pollution water quality community structure phytoplankton pollution Argentina, Buenos Aires, Lujan River Cyclotella meneghiniana Nitzschia stagnorum
spellingShingle	community structure lowland river multivariate analysis phytoplankton pollution water quality community structure phytoplankton pollution Argentina, Buenos Aires, Lujan River Cyclotella meneghiniana Nitzschia stagnorum Del Giorgio, Pablo A. Vinocur, Alicia Liliana Progressive changes in the structure and dynamics of the phytoplankton community along a pollution gradient in a lowland river - a multivariate approach
topic_facet	community structure lowland river multivariate analysis phytoplankton pollution water quality community structure phytoplankton pollution Argentina, Buenos Aires, Lujan River Cyclotella meneghiniana Nitzschia stagnorum
description	The phytoplankton of the River Lujan (Buenos Aires, Argentina) was studied for a period of 18 months, together with physical and chemical variables, in relation to a pollution gradient. 167 taxa were recorded within a seasonal succession characterized by dominance of diatoms with a brief summer green algae facies. A combination of several biotic indices and multivariate analysis was employed to assess the impact of pollution on the phytoplankton community. The biotic indices used were species diversity and richness, algal quotients (green algae/diatom ratio, Centrales/Pennales ratio) and the SD succession rate index. Multivariate procedures included cluster analysis and ordination by PCA of both species and samples, stepwise discriminant analysis and multiple discriminant analysis of variance (MANOVA). Results indicate that community dynamism is attenuated at the more polluted sites, concomitant with an increased predominance of a broad-tolerance algal assemblage, co-dominated by Cyclotella meneghiniana and Nitzschia stagnorum. The changes in the community structure and dynamics described herein involved alterations in the distribution and relative proportions of the algae, rather than modifications in the basic species composition. These changes may not be readily detectable by methods which over-simplify the ecological information, such as systems of indicator species and biotic indices, designed to assess the degree of pollution. The suitability of multivariate analysis and biotic indices in river phytoplankton studies is further discussed. © 1991 Kluwer Academic Publishers.
author	Del Giorgio, Pablo A. Vinocur, Alicia Liliana
author_facet	Del Giorgio, Pablo A. Vinocur, Alicia Liliana
author_sort	Del Giorgio, Pablo A.
title	Progressive changes in the structure and dynamics of the phytoplankton community along a pollution gradient in a lowland river - a multivariate approach
title_short	Progressive changes in the structure and dynamics of the phytoplankton community along a pollution gradient in a lowland river - a multivariate approach
title_full	Progressive changes in the structure and dynamics of the phytoplankton community along a pollution gradient in a lowland river - a multivariate approach
title_fullStr	Progressive changes in the structure and dynamics of the phytoplankton community along a pollution gradient in a lowland river - a multivariate approach
title_full_unstemmed	Progressive changes in the structure and dynamics of the phytoplankton community along a pollution gradient in a lowland river - a multivariate approach
title_sort	progressive changes in the structure and dynamics of the phytoplankton community along a pollution gradient in a lowland river - a multivariate approach
publishDate	1991
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v224_n3_p129_delGiorgio http://hdl.handle.net/20.500.12110/paper_00188158_v224_n3_p129_delGiorgio
work_keys_str_mv	AT delgiorgiopabloa progressivechangesinthestructureanddynamicsofthephytoplanktoncommunityalongapollutiongradientinalowlandriveramultivariateapproach AT vinocuralicialiliana progressivechangesinthestructureanddynamicsofthephytoplanktoncommunityalongapollutiongradientinalowlandriveramultivariateapproach
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Progressive changes in the structure and dynamics of the phytoplankton community along a pollution gradient in a lowland river - a multivariate approach

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