Estrutura da comunidade de Chlorococcales sensu lato (Chlorophyceae) em diferentes hábitats aquáticos e hidroperíodos

Abstract

ABSTRACT(Structure of the Chlorococcales sensu lato (Chlorophyceae) community in different aquatic habitats and hydroperiods). This study aims to evaluate richness, density specific diversity and distribution of the Chlorococcales s.l. community in pelagic and littoral zones of different aquatic habitats (isolated lagoons, interlinked lagoons, swamps, reservoirs and streams) during two hydroperiods (high and low water) in a subtropical region in Southern Brazil. Phytoplankton sampling was carried out in two areas, situated within the coordinates 30 0 40´ -30 0 10´ S and 50 0 30´ -51 0 31´ W, in 2003 with simultaneous information on temperature, conductivity, pH, transparency and depth of water. The results showed that richness and specific diversity averages were higher in the littoral zone and significantly higher (p<0.02) in swamps in contrast to other habitats. Density averages were also significantly higher in swamps (p<0.03), during low water periods (p<0.04) and at warmer water temperatures (>24°C

Distribution and ecological habitat of Scenedesmus and related genera in some freshwater resources of Northern and North-Eastern Thailand

“…They can grow in highly polluted water and are typically used as pollution indicators In temperate zones, there have been extensive studies on the diversity and taxonomy of the members of this genera, while water quality assessment has also been deeply studied (Brettum andAndersen 2005 andShubert et al 2014). The sampling sites of certain countries that are located in tropical zones, such as those of Peru, India and Brazil, have been studied by a number of researchers (Hegewald and Schnepf 1978, Mousumi and Jai 2015, Godinho et al 2010, Hentschke and Torgan 2010, Torgan and Hentschke 2011and Ramos et al 2015. However, there have not been any studies on the diversity and classification of this group of algae in Thailand.…”

New additions of coccoid green algae to the phycoflora of Brazil and the Neotropics

“…Although coccoid green algae have been studied in Brazil since the end of the 19th century (Moseley 1875;Bohlin 1897), it was only in the 1970s that research focusing on these algae became more common, with studies concentrated in the southeast (Sant' Anna 1984;Nogueira 1991Nogueira , 1994Nogueira , 1996Fernandes & Bicudo 2009;Rosini et al 2012), south (Felisberto et al 2001;Moresco & Bueno 2007;Torgan & Hentschke 2011;Domingues & Torgan 2012;Hentschke & Prado 2012), central-west (De-LamonicaFreire & Sant' Anna 1993Nogueira & Oliveira 2009;Bortolini et al 2010), and north (Sant' Anna & Martins 1982;Bittencourt-Oliveira 1993). Little is currently known about these algae in the northeastern region of Brazil, especially in the caatinga (shrublands).…”

Efficiency of Neutral Red, Evans Blue and MTT to assess viability of the freshwater microalgae Desmodesmus communis and Pediastrum boryanum

“…The goal of this work was to analyze comparatively the three techniques, MTT, NR, and EB, in two different freshwater microalgal species, Desmodesmus communis (E. Hegewald) E. Hegewald, and Pediastrum boryanum (Turpin) Meneghini, that are representatives of the order Chlorococcales, recognized as cosmopolitan, and typical of eutrophicated environments (Bicudo & Menezes ). Additionally, both species play an essential role in identifying boundaries and directions of environmental changes in aquatic ecosystems, stressing the importance of studying these algae (Round ; Torgan & Hentschke ).…”