The cyanobacterial genus Nostoc is an important contributor to carbon and nitrogen bioavailability in terrestrial ecosystems a frequent partner symbiotic relationships with non-diazotrophic organisms. However, since this currently polyphyletic genus, the diversity of -like cyanobacteria considerably underestimated at moment. While reviewing phylogenetic placement previously isolated originating from Brazilian Amazon, Caatinga Atlantic forest samples, we detected 17 strains soil, freshwater,...

Cyanobacteria dwelling on the salt-excreting leaves of mangrove tree Avicennia schaueriana were isolated and characterized by ecological, morphological genetic approaches. Leaves collected in a with history oil contamination coastline São Paulo state, Brazil, isolation was achieved smearing surface solid media or submerging liquid media. Twenty-nine strains shown to belong five cyanobacterial orders (thirteen Synechococcales, seven Nostocales, Pleurocapsales, one Chroococcales,...

The last decade was marked by efforts to define and identify the main cyanobacterial players in biological crusts around world. However, not much is known about biocrusts Brazil's tropical savanna (cerrado), despite existence of environments favorable their development ecological relevance. We examined community composition cyanobacteria from six sites distributed Southeast country using high throughput sequencing 16S rRNA phylogenetic placement wider context deserts. Sequences ascribable...

Two Cyanobacteria isolated from South Atlantic Ocean continental shelf deep water and a marine green algae inhabiting the Admiralty Bay, King George Island, Antarctica were investigated based on morphological ultrastructural traits, phylogeny of 16S rRNA gene sequences, secondary structure 16S-23S internal transcribed spacer regions phylogenomic analyses. The majority these evaluations demonstrated that both strains differ genera cyanobacteria with validly published names and, therefore,...

Tropical ecosystems worldwide host very diverse microbial communities, but are increasingly threatened by deforestation and climate change. Thus, characterization of biodiversity in these environments, especially communities that show unique adaptations to their habitats, is a urgent matter. Information about representatives the phylum Cyanobacteria tropical environments scarce, even though they fundamental primary producers help other microbes thrive nutrient-depleted including...

Phormidium Kützing ex Gomont, a common genus of the Cyanobacteria , is widely known as problematic group. Its simple morphology not congruent with its genetic heterogeneity and several new generic entities have been described based on 16S rRNA gene sequence analyses from populations similar morphology. During study diversity Phormidioideae (Phormidiaceae, Oscillatoriales) in Brazil, ten Phormidium-like strains south-eastern mid-western regions were isolated monospecific cultures submitted to...

A new Phormidium ‐like genus was found during an investigation of Oscillatoriales diversity in Brazil. Eight aerophytic populations from south and southeastern regions were isolated monospecific cultures submitted to polyphasic evaluation. The presented homogeneous morphology with straight trichomes, not attenuated, apical cell thickened wall. Phylogenetic analyses based on 16S rRNA gene sequences showed that these populations, plus the Brazilian strain Phomidium sp. B‐Tom GenBank, formed a...

During a study about the diversity of Phormidioideae (Phormidiaceae, Oscillatoriales) in Brazil, seven strains from southern and southeastern regions were isolated monospecifc cultures submitted to polyphasic evaluation (morphological, ecological, cytological molecular studies). The populations studied found be morphologically similar Kamptonema (filaments narrowed bent at end) cytologically different (thylakoids' arrangement - radial distribution Brazilian parietal Kamptonema). original...

Three procedures (line transect, point intercept and quadrat) for estimating abundance of macroscopic components periphyton (macroalgae bryophytes) were compared in two bedrock streams from southeastern Brazil on the basis frequency percent cover. In addition, quadrat sizes (25 50 cm) tested best size. Samplings all made within a 10 m length stream reach. Differences by means analysis variance, ANOVA - one way, Student's t test Chi-square test, whereas associations among them evaluated...

Variations in microbial communities promoted by alterations environmental conditions are reflected similarities/differences both at taxonomic and functional levels. Here we used a natural gradient within mangroves from seashore to upland, contrast the variability bacteria, cyanobacteria diazotroph assemblages pristine area compared an oil polluted along timespan of three years, based on ARISA (bacteria cyanobacteria) nifH T-RFLP (diazotrophs) fingerprinting. The data presented herein...

Distribution of Rhodophyta was investigated in 172 stream segments, which were sampled from May to October 1992-1993 and 1996-1997 six natural regions (parts biomes or geological areas) Sao Paulo State, southeastern Brazil. Red algae occurred 60.5 % segments sampled, a high frequency comparison with other major surveys the world (18-65 %). 17 species freshwater red found, most widespread Batrachospermum delicatulum occurring sites five regions. The proportion morphological types as follows:...

Twelve stream segments were sampled four times in 1998-1999 (one sampling per season) the drainage basin of upper São Francisco River (19º45'-21º25'S, 49º05'-51º30'W), situated Serra da Canastra National Park, at altitudes ranging from 1,175 to 1,400 m. The macroalgae survey resulted 30 species, with a predominance Cyanophyta (12 species = 40%) and Chlorophyta (11 36.5%) lower proportion Rhodophyta (seven 23.5%). Two Klebsormidium rivulare (Chlorophyta) Kyliniella latvica (Rhodophyta), new...

Three drainage basins belonging to different systems, but in close proximity, were evaluated compare the seasonal dynamics of macroalgal communities northwest region Sao Paulo State, southeastern Brazil and evaluate most influential stream environmental variables. Monthly samplings carried out from September 1992 through 1993 three sampling sites along main river each basin. 10 m length cross segments for species percent cover richness, on both population community levels. Selected variables...

Three drainage basins belonging to different systems, but in close proximity, were evaluated compare the distribution of macroalgal communities northwest region Sao Paulo State, southeastern Brazil. Monthly samplings carried out from September 1992 through 1993 three sites along main river each basin. 10m length cross segments for species percent cover and richness, on both population community levels. Selected stream variables measured: specific conductance, temperature, turbidity, mean...

Macroalgal communities and environmental variables were analyzed seasonally along a polluted tropical stream in Sao Paulo State, Brazil. We aimed to improve the knowledge of macroalgal communities, study longitudinal seasonal dynamics these influenced environments, evaluate relationship algal frequency abundance with selected variables, look for potential species indicators. The pattern was similar natural or low systems mainly determined by rainfall regime. However, community composition...

O Parque Nacional de Itatiaia (PNI) inclui duas formações vegetais brasileiras em seus limites: floresta pluvial tropical atlântica (MA) e campos altitude (CA). Foram amostrados 14 pontos, sete cada formação vegetal, estações do ano (verão inverno). encontradas 29 espécies macroalgas, sendo 15 MA 19 CA, com apenas cinco comum. A riqueza por ponto amostragem variou 1 a 7 (2,9 ± 2,0), o índice diversidade Shannon-Wiener (H') 0 0,94 (0,24 0,26) cobertura percentual 35% (14,0 12,5%). Estes...

The genus Wilmottia was described based on polyphasic studies of Phormidium murrayi populations that revealed them not closely related to other species, despite their morphological similarity. contained one W. murrayi, found exclusively in cold and temperate areas the world. Other species morphologically similar were expected pertain Wilmottia, but remained unispecific until now. During a survey Cyanobacteria Brazil, 11 strains from southern southeastern regions isolated unicyanobacterial...

In the uppermost millimeters of soils is commonly found a thin layer cryptobiotic organisms, including cyanobacteria, microalgae, lichens, mosses, fungi, bacteria and archaea. These communities are called Biological Soil Crusts (BSCs) or biocrusts perform important ecological functions, mainly attributed to their capacity providing soil stability incorporate nutrients through nitrogen carbon fixation. Among all organisms in biocrusts, filamentous cyanobacteria Microcoleus vaginatus M....