%0 Journal Article
%T Diatom¨¢ceas perif¨ªticas em um sistema eutr¨®fico brasileiro (Reservat¨®rio do Ira¨ª, estado do Paran¨¢)
%A Silva
%A Angela Maria da
%A Ludwig
%A Thelma Alvim Veiga
%A Tremarin
%A Priscila Izabel
%A Vercellino
%A Ilka Schincariol
%J Acta Botanica Brasilica
%D 2010
%I Sociedade Bot?nica do Brasil
%R 10.1590/S0102-33062010000400015
%X this floristic survey contributed to our knowledge of periphytic diatoms in a eutrophic reservoir in paran¨¢ state, and provided a basis for future works using diatoms as bioindicators of trophic water conditions. samples were collected quarterly, over a year, by removing the biofilm attached to polygonum sp. stems and to glass slides. the slides were placed in wooden frames and remained submersed for 30 days to colonize. the taxonomic study resulted in 11 new taxonomic records for paran¨¢ state among the 96 identified diatoms. the highest species diversity was found in the macrophyte samples. achnanthidium minutissimum was dominant in most samples analyzed and considered tolerant of the eutrophic conditions in ira¨ª reservoir. fragilaria rumpens, fragilaria vaucheriae var. capitellata and gomphonema gracile were abundant. ecological information on the species was obtained from the literature; 35% of the species were characteristic of aquatic systems in an advanced state of eutrophication, 18% of mesotrophic environments and 19% were classified as tolerant and indifferent to the trophic state of the environment.
%K algae
%K bioindicator
%K bacillariophyta
%K eutrophication
%K periphytic.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0102-33062010000400015&lng=en&nrm=iso&tlng=en