Cianobactérias de diferentes tipos de lagoas ("salina", "salitrada" e "baía") representativas do Pantanal da Nhecolândia, MS, Brasil

Abstract

-(Cyanobacteria from different types of lakes ("salina", "salitrada" and "baía") representative of the Pantanal da Nhecolândia, MS, Brazil). Considering the ecological importance of cyanobacteria and the scarcity of more precise information about these organisms in the different aquatic systems of the Brazilian Pantanal, our aim is the study of the cyanobacterial flora in three lakes in the Pantanal da Nhecolândia region. The studied lakes are natural water bodies and are shallow (maximum depth 1.1 m), rounded and present different limnological features mainly regardin to the pH and salinity. The samples were collected in the dry and rainy seasons, during 2004-2007. Twenty one species of cyanobacteria were identified. Oscillatoriales was the order with the highest species richness (24% of the total of the identified species), followed by Synechococcales, Pseudanabaenales, Chroococcales and Nostocales, each one contributing with 19%. The lake "Salina do Meio" presents extreme environmental conditions and was the highest species richness system for cyanobacterial (13 species-62%). In this lake, blooms of Anabaenopsis elenkinii Miller were observed, mainly during the dry season. The lakes "Salitrada Campo Dora" (9 species) and "Baía da Sede Nhumirim" (9) presented equals species richness, but the floristic composition was distinct probably due to their different limnological conditions. All the species were referred for the first time to the Brazilian Pantanal.

Effects of the pH on growth and morphology of Anabaenopsis elenkinii Miller (Cyanobacteria) isolated from the alkaline shallow lake of the Brazilian Pantanal.

“…1, c-j). However, the Brazilian material frequently presents longer trichomes (up to12 cells) and elliptical cells (SantoS & Sant'anna 2010). Besides, the metric parameters are also very distinct: A. hungarica presents 2.5 µm wide trichomes and the A. elenkinii trichomes are wider (4.5 µm) (koMárek 2005).…”

“…Besides, the metric parameters are also very distinct: A. hungarica presents 2.5 µm wide trichomes and the A. elenkinii trichomes are wider (4.5 µm) (koMárek 2005). According to morphometric parameters, the material from Pantanal (from nature and from culture) is similar to A. elenkinii and the variability observed was considered as part of the natural variability of this species (koMárek 2005, SantoS & Sant'anna 2010.…”

“…These alkaline lakes were isolated from rivers or streams and the main source of water is rainfall and groundwater (barbiéro et al 2002). In the alkaline lakes there are no macrophytes or fish and the dominant organisms are cyanobacteria (SantoS & Sant'anna 2010).…”

“…In these Brazilian extreme lakes, Anabaenopsis elenkinii Miller is the dominant organism and forms blooms (Fig. 1 a,b), mainly in the dry season (SantoS & Sant'anna 2010).…”

Euglenophyta de lagoas da região da Nhecolândia, Pantanal Sul-Matogrossense, Brasil

“…Apesar dos numerosos lagos que compõem a planície pantaneira, existem ainda relativamente poucos trabalhos sobre a comunidade fitoplanctônica para o Pantanal Sul, sendo que a maioria dos estudos aborda aspectos estruturais e a influência do pulso de inundação em rios, baías e salinas (Espíndola et al 1996, Oliveira & Calheiros 2000, Domitrovic 2002, Cardoso et al 2012, Malone et al 2012 e apenas um aborda a taxonomia do fitoplâncton (Santos & Sant'Anna 2010).…”