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Hidrobiológica
versão impressa ISSN 0188-8897
Resumo
BERALDI-CAMPESI, Hugo et al. Benthic diatoms on fluvial tufas of the Mesa River, Iberian Range, Spain. Hidrobiológica [online]. 2016, vol.26, n.2, pp.283-297. ISSN 0188-8897.
Background:
The Mesa River (MR) in the Iberian Range (Spain) displays prominent, Pleistocene to present-day fluvial tufa deposits. Little of their associated microbiota has been studied to date despite the regional and historical relevance of these calcareous buildups.
Goals:
This paper is a preliminary exploration of the diatom (Bacillariophyta) genera associated with actively-growing tufa from 10 benthic environments along 24 km of the Mesa River.
Methods:
Brightfield microscopy, as well as consultation with specialists and specialized literature was used for taxonomic classification of diatoms.
Results:
We identified 25 diatom genera in three different types of sedimentary facies (porous and moss-algae rich, dense-laminated, and tufa-free gravel). Most diatoms were raphid pennate (class Bacillariophyceae), while a few were centric (class Coscinodiscophyceae) or araphid pennate (class Fragilariophyceae). They appeared as integral components of the tufa structure along with cyanobacteria and other algae and mosses.
Conclusions:
Together with previous studies on the hydrochemistry and sedimentology of the MR, our interpretations suggest that HCO3-, pCO2, Ca2+, and TDIC negatively affect diatom richness and that their abundance is positively related to the presence of mosses and algae.
Palavras-chave : Benthic diatoms; freshwater tufas; Iberian Range, Spain.