2 research outputs found
High protists diversity in the plankton of sulfurous lakes and lagoons examined by 18s rRNA gene sequence analyses
10 p谩ginas, 7 figuras, 1 tabla.Diversity of small protists was studied in sulfidic and
anoxic (euxinic) stratified karstic lakes and coastal
lagoons by 18S rRNA gene analyses. We hypothesized
a major sulfide effect, reducing protist diversity
and richness with only a few specialized
populations adapted to deal with low-redox conditions
and high-sulfide concentrations. However,
genetic fingerprinting suggested similar ecological
diversity in anoxic and sulfurous than in upper
oxygen rich water compartments with specific populations
inhabiting euxinic waters. Many of them
agreed with genera previously identified by microscopic
observations, but also new and unexpected
groups were detected. Most of the sequences
matched a rich assemblage of Ciliophora (i.e., Coleps,
Prorodon, Plagiopyla, Strombidium, Metopus, Vorticella
and Caenomorpha, among others) and algae
(mainly Cryptomonadales). Unidentified Cercozoa,
Fungi, Stramenopiles and Discoba were recurrently
found. The lack of GenBank counterparts was higher
in deep hypolimnetic waters and appeared differentially
allocated in the different taxa, being higher
within Discoba and lower in Cryptophyceae. A larger
number of populations than expected were specifically
detected in the deep sulfurous waters, with
unknown ecological interactions and metabolic
capabilities.Financial support from the Spanish
Office of Science (MINECO) with grants GOS-LAKES CGL2009-08523-E and DARKNESS CGL2012-32747 to
EOC is acknowledgedPeer reviewe