Composition and structure of the epilithic diatom communities from Izbucul Cernei, Cernişoara and the confluence area (Gorj County)
Journal Title: Advances in Environmental Sciences - International Journal of the Bioflux Society - Year 2012, Vol 4, Issue 2
Abstract
The paper presents the results obtained after determining and processing some relatively quantitative samples used to characterize the epilithic diatom communities installed in the biggest carstic spring from Romania, Izbucul Cernei, into Cernişoara brook, as well as in the upstream of Cerna river, formed from the two mentioned streams. Recent articles (Wynn et al 2010; Onac et al 2011) approach unique hydro-geological and geo-chemical aspects present in the upstream area of Cerna Valley, but a diatom community characterization, an especially important algal group (Vanormelingen et al 2008) for this upstream area has not been done yet. Samples were harvested seasonally, from several sampling points; 121 specific and intra-specific taxa were identified as part of the epilithic diatom communities, dominating, both quantitatively and qualitatively, Achnanthes minutissima Kützing. Some structural parameters of the epilithic diatom communities were determined (floristic similarity through Sørensen index and specific diversity using Shannon index). Comparing the obtained results we conclude that in these streams, where the anthropic impact is minimal and the chemistry of water does not differ significantly, the determinant factors of the composition and structure of the epilithic diatom communities are those related to the morphology of the streams and the physical parameters of water.
Authors and Affiliations
Adrian Sinitean, Nicoleta Ianovici, Milca Petrovici
Keywords
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