Variación estacional de la comunidad microfitoplanctónica del curso medio del río Colorado (La Pampa-Argentina)
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We analyzed the seasonal variation of the phycoflora in the Colorado River alluvium with the aim of expanding knowledge of algal biodiversity in lotic environments of the province of La Pampa. The study area is located in the middle basin of the Colorado River (38º 49’ S and 64º 59’ W), Lihue Calel, which is the natural limit between La Pampa and Río Negro provinces. The site is located 122 meters above sea level with a channel width of 113 m. Samples were collected according to the standard methodology for lotic environments during autumn 2010 - autumn 2011. Physicochemical parameters were measured in situ. Water temperature ranged from 3.4 to 24°C for winter and summer respectively. The pH ranged between 8.1 and 8.6, the conductivity varied between 938 and 1950 μS cm-1 and the flow velocity ranged between 0.5 and 0.9 m sec-1. Phytoplankton samples were deposited in the Herbarium SRFA (UNLPam). 163 taxa were identified mostly belonging to Bacillariophyceae (42%). Chlorophyceae contributed 36%, while 17% Cyanobacteria, Euglenophyceae, Dinophyceae, Rhodophyceae and Xanthophyceae were found as companions taxa. The similarity of biodiversity in the alluvial section of the Colorado River is almost 70% as observed in the dendrogram resulting from the application of the Bray Curtis index, and grouped according to a seasonal sampling sequence.
Autor/a
Biasotti, A.E.
Alvarez, S.B.
Bazán, G.I.
Martínez de Fabricius, A.L.
Fecha
2014Tipo de documento
artículo
Subtipo de documento
Artículos
Artículos
dc.language.iso
spa
En: Biología Acuática. 2014; no.30
eISSN: e1668-4869
Editor: Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional de La Plata. Instituto de Limnología;
Extensión: p. 249-258
Palabras clave
Ficoflora; Ambiente lóticos; Indice de similitud.;
Keywords
Phycoflora; Lotic environment; Similarity index;
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