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Abstract:

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.

Registro:

Documento: Artículo
Título:Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)
Autor:Martínez De Fabricius, A.L.; Maidana, N.; Gómez, N.; Sabater, S.
Filiación:Departamento de Cs. Naturales, FCEFQyN, UNRC, Rio Cuarto, 5800 Córdoba, Argentina
Depto. de Biodiversidad y Biol. Exp., FCE.y N, UBA-CONICET. C. Universitaria, 1428 Buenos Aires, Argentina
Inst. Limnologia Dr. R.A. Ringuelet, CONICET-UNLP, CC 712, 1900 La Plata Buenos Aires, Argentina
Institut d'Ecologia Aquàtica, Department of Environmental Sciences, University of Girona, E-17071 Girona, Spain
Palabras clave: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
Año:2003
Volumen:12
Número:12
Página de inicio:2443
Página de fin:2454
DOI: http://dx.doi.org/10.1023/A:1025857715437
Título revista:Biodiversity and Conservation
Título revista abreviado:Biodiversity Conserv.
ISSN:09603115
CODEN:BONSE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09603115_v12_n12_p2443_MartinezDeFabricius

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Citas:

---------- APA ----------
Martínez De Fabricius, A.L., Maidana, N., Gómez, N. & Sabater, S. (2003) . Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina). Biodiversity and Conservation, 12(12), 2443-2454.
http://dx.doi.org/10.1023/A:1025857715437
---------- CHICAGO ----------
Martínez De Fabricius, A.L., Maidana, N., Gómez, N., Sabater, S. "Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)" . Biodiversity and Conservation 12, no. 12 (2003) : 2443-2454.
http://dx.doi.org/10.1023/A:1025857715437
---------- MLA ----------
Martínez De Fabricius, A.L., Maidana, N., Gómez, N., Sabater, S. "Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina)" . Biodiversity and Conservation, vol. 12, no. 12, 2003, pp. 2443-2454.
http://dx.doi.org/10.1023/A:1025857715437
---------- VANCOUVER ----------
Martínez De Fabricius, A.L., Maidana, N., Gómez, N., Sabater, S. Distribution patterns of benthic diatoms in a Pampean river exposed to seasonal floods: The Cuarto River (Argentina). Biodiversity Conserv. 2003;12(12):2443-2454.
http://dx.doi.org/10.1023/A:1025857715437