Abstract

DE FABRICIUS, Ana Luján M.; LUQUE, M. Elisa  and  BOCCOLINI, Mónica. Diatom communities in the highland water streams. Piedra Blanca River basin (Córdoba, Argentina). Bol. Soc. Argent. Bot. [online]. 2005, vol.40, n.3-4, pp.183-198. ISSN 1851-2372.

The present work was developed in El Chacay Creek and Las Albahacas River from 1999 spring to 2000 spring. The aim of this investigation was to compare the composition and abundance of the diatom communities of a highland water stream and a river within the Piedra Blanca River basin, during an annual cycle. As a result of a taxonomic analysis a total of 121 taxa (species, varieties and forms) were recorded. The Order Pennales predominated in number of species and relative frequency. The genus with the highest number of species was Navicula. The total number of species varied from a minimum of 21 in 2000 winter season in the Las Albahacas River (upstream riverside resort) to a maximun of 49 in 2000 summer in the El Chacay Creek and during 2000 spring in the Las Albahacas River (upstream riverside resort) respectively. The occurrence of a number of species with low frequency was noticed. The density varied from a minimun of 1 org.ml^-1 in 2000 fall in the Las Albahacas River, upstream riverside resort, to a maximum of 1596,4 org.ml^-1 in 1999 spring at El Chacay Creek. The physical and chemical factors as well as the species composition, a more similarity was found for the spring season in all studied spots.

Keywords : Diatoms; River; Stream; Community; Plankton.

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