Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)

The diatom community growing on cobbles and sand substrata along the Cuarto River (Córdoba, Argentina) was studied during 2000 and 2001. Multivariate analyses of the data (PCA and CCA) showed distinct differences in water chemistry and substrata types between the upstream sites (sites 1-10) and down...

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Publicado:	2003
Materias:	Diatoms Floods Habitat Rocks Sand South America Water flow benthos diatom flooding multivariate analysis substrate water chemistry Argentina Achnanthes biasolettiana Achnanthidium minutissimum Amphora montana Bacillariophyta Diatoma Diatoma moniliformis Diatoma vulgaris Fallacia insociabilis Fragilaria capucina Gomphonema Gomphonema angustum Hantzschia amphioxys Lanceolata Luticola mutica Moniliformis Navicula Navicula cryptocephala var. veneta Nitzschia Nitzschia lacuum Nitzschia palea Nitzschia umbonata Palea Planothidium lanceolatum Reimeria Sellaphora pupula Synedra ulna
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09603115_v12_n12_p2443_MartinezDeFabricius http://hdl.handle.net/20.500.12110/paper_09603115_v12_n12_p2443_MartinezDeFabricius
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09603115_v12_n12_p2443_MartinezDeFabricius
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spelling	paper:paper_09603115_v12_n12_p2443_MartinezDeFabricius2023-06-08T15:57:37Z Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina) Diatoms Floods Habitat Rocks Sand South America Water flow benthos diatom flooding multivariate analysis substrate water chemistry Argentina Achnanthes biasolettiana Achnanthidium minutissimum Amphora montana Bacillariophyta Diatoma Diatoma moniliformis Diatoma vulgaris Fallacia insociabilis Fragilaria capucina Gomphonema Gomphonema angustum Hantzschia amphioxys Lanceolata Luticola mutica Moniliformis Navicula Navicula cryptocephala var. veneta Nitzschia Nitzschia lacuum Nitzschia palea Nitzschia umbonata Palea Planothidium lanceolatum Reimeria Sellaphora pupula Synedra ulna The diatom community growing on cobbles and sand substrata along the Cuarto River (Córdoba, Argentina) was studied during 2000 and 2001. Multivariate analyses of the data (PCA and CCA) showed distinct differences in water chemistry and substrata types between the upstream sites (sites 1-10) and downstream sites (sites 11-19). Sites 1-10 supported an epilithic diatom community associated with low water conductivity and gravel substrata. This consisted of adnate Achnanthes (A. biasolettiana, A. minutissima), as well as stalked (Gomphonema aff. angustum, Reimeria uniseriata, Fragilaria capucina var. rumpens) or prostrate (Nitzschia lacuum) taxa. Downstream sites were associated with high conductivity, fast flowing waters and finer substrata (sand, silt), and were colonised by prostrate diatoms, including several species of Navicula (N. pupula, N. mutica, N. veneta, N. insociabilis) and Nitzschia (N. umbonata, N. palea). Variations in water flow caused significant changes in the diatom communities of the river. During periods of low flow (winter and autumn), chain forming (Diatoma vulgaris, D. moniliformis) or stalked (Synedra ulna) taxa partially replaced the former community of Navicula and Nitzschia in the downstream sites. High flow (in summer) led to diatoms of large size being replaced by smaller size diatoms, such as Achnanthes lanceolata, Navicula mutica, Hantzschia amphioxys and Amphora montana. The severe effect of floods in the lower part of the Cuarto led to these taxa having a much higher proportion in the lower stretch of the river, taking advantage of the subaerial conditions created by the floods. Local episodes of water pollution were associated with a transient shift towards the dominance of Navicula pupula, Synedra ulna, Nitzschia lacuum and Reimeria uniseriata during winter, when inputs were least diluted because of the low flow. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09603115_v12_n12_p2443_MartinezDeFabricius http://hdl.handle.net/20.500.12110/paper_09603115_v12_n12_p2443_MartinezDeFabricius
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Diatoms Floods Habitat Rocks Sand South America Water flow benthos diatom flooding multivariate analysis substrate water chemistry Argentina Achnanthes biasolettiana Achnanthidium minutissimum Amphora montana Bacillariophyta Diatoma Diatoma moniliformis Diatoma vulgaris Fallacia insociabilis Fragilaria capucina Gomphonema Gomphonema angustum Hantzschia amphioxys Lanceolata Luticola mutica Moniliformis Navicula Navicula cryptocephala var. veneta Nitzschia Nitzschia lacuum Nitzschia palea Nitzschia umbonata Palea Planothidium lanceolatum Reimeria Sellaphora pupula Synedra ulna
spellingShingle	Diatoms Floods Habitat Rocks Sand South America Water flow benthos diatom flooding multivariate analysis substrate water chemistry Argentina Achnanthes biasolettiana Achnanthidium minutissimum Amphora montana Bacillariophyta Diatoma Diatoma moniliformis Diatoma vulgaris Fallacia insociabilis Fragilaria capucina Gomphonema Gomphonema angustum Hantzschia amphioxys Lanceolata Luticola mutica Moniliformis Navicula Navicula cryptocephala var. veneta Nitzschia Nitzschia lacuum Nitzschia palea Nitzschia umbonata Palea Planothidium lanceolatum Reimeria Sellaphora pupula Synedra ulna Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)
topic_facet	Diatoms Floods Habitat Rocks Sand South America Water flow benthos diatom flooding multivariate analysis substrate water chemistry Argentina Achnanthes biasolettiana Achnanthidium minutissimum Amphora montana Bacillariophyta Diatoma Diatoma moniliformis Diatoma vulgaris Fallacia insociabilis Fragilaria capucina Gomphonema Gomphonema angustum Hantzschia amphioxys Lanceolata Luticola mutica Moniliformis Navicula Navicula cryptocephala var. veneta Nitzschia Nitzschia lacuum Nitzschia palea Nitzschia umbonata Palea Planothidium lanceolatum Reimeria Sellaphora pupula Synedra ulna
description	The diatom community growing on cobbles and sand substrata along the Cuarto River (Córdoba, Argentina) was studied during 2000 and 2001. Multivariate analyses of the data (PCA and CCA) showed distinct differences in water chemistry and substrata types between the upstream sites (sites 1-10) and downstream sites (sites 11-19). Sites 1-10 supported an epilithic diatom community associated with low water conductivity and gravel substrata. This consisted of adnate Achnanthes (A. biasolettiana, A. minutissima), as well as stalked (Gomphonema aff. angustum, Reimeria uniseriata, Fragilaria capucina var. rumpens) or prostrate (Nitzschia lacuum) taxa. Downstream sites were associated with high conductivity, fast flowing waters and finer substrata (sand, silt), and were colonised by prostrate diatoms, including several species of Navicula (N. pupula, N. mutica, N. veneta, N. insociabilis) and Nitzschia (N. umbonata, N. palea). Variations in water flow caused significant changes in the diatom communities of the river. During periods of low flow (winter and autumn), chain forming (Diatoma vulgaris, D. moniliformis) or stalked (Synedra ulna) taxa partially replaced the former community of Navicula and Nitzschia in the downstream sites. High flow (in summer) led to diatoms of large size being replaced by smaller size diatoms, such as Achnanthes lanceolata, Navicula mutica, Hantzschia amphioxys and Amphora montana. The severe effect of floods in the lower part of the Cuarto led to these taxa having a much higher proportion in the lower stretch of the river, taking advantage of the subaerial conditions created by the floods. Local episodes of water pollution were associated with a transient shift towards the dominance of Navicula pupula, Synedra ulna, Nitzschia lacuum and Reimeria uniseriata during winter, when inputs were least diluted because of the low flow.
title	Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)
title_short	Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)
title_full	Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)
title_fullStr	Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)
title_full_unstemmed	Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)
title_sort	distribution patterns of benthic diatoms in a pampean river exposed to seasonal floods: the cuarto river (argentina)
publishDate	2003
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09603115_v12_n12_p2443_MartinezDeFabricius http://hdl.handle.net/20.500.12110/paper_09603115_v12_n12_p2443_MartinezDeFabricius
_version_	1768542135704879104

Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)

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