New taxa of the genus Navicula (Bacillariophyceae) in the diatom flora of Serbia

Abstract

The main objective of this paper is to report two benthic, epilithic diatom species from the Raška River. Samples were collected in April, June, August and November 2011 and March and May 2012 from 5 localities along the Raška River by scraping off the stone surface using a brush. Diatom frustules were first cleaned using the cold acid method, and then mounted on permanent slides. Descriptions (main valve measurements of the populations in the Raška River), ecology, distribution in Serbia and Europe, and appropriate photomicrographs of two species are presented. Navicula jakovljevicii Hustedt and Navicula catalanogermanica Lange-Bertalot & Hofmann are rarely found in Europe and these are new distributional records. These new taxa significantly contribute to diatom floristic diversity of the Raška River.

Diversity and new records of species from genus Eunotia (Bacillariophyceae, Ochrophyta) in freshwater habitats on Vranica mountain (Bosnia and Herzegovina)

“…Taxonomic reviews of algae from the genus Eunotia for the Balkan Peninsula are scarce. Relevant data can be found in the publications of Pavlov & Levkov (2013) and Krizmanić & al. (2015).…”

“…Authors Pavlov & Levkov (2013) determined the presence of 53 species from the genus Eunotia for the algal flora of Macedonia, while authors Krizmanić & al. (2015) determined the presence 18 species for the algae flora of Serbia.…”

“…(2015) determined the presence 18 species for the algae flora of Serbia. Krizmanić & al. (2015) found that the pH value at the investigated localities ranged from 5.46 to 6.50, while the values for electrical conductivity ranged from 231 to 302 μScm -1 .…”

“…By comparing the above results with our research, it can be concluded that the values of pH and electrical conductivity are slightly higher than the values of physical and chemical parameters measured in Serbia. According to the literature, the waters inhabited by species of the genus Eunotia are characterized by a low to moderate concentration of electrolytes, and the pH value varies from acidic to neutral (Krizmanić & al. 2015).…”

“…The authors of Oritz-Lerin & Cambra (2007) found that pH value and electrolyte composition are the main factors for the distribution of species of this genus, while the temperature of the water has no significant effect (Krizmanić & al. 2015).…”