Characteristics and Diversity of Cyanobacteria in Periphyton from Lentic Tropical Ecosystem, Brazil

Abstract

This study aimed to perform the taxonomic survey of the species of periphytic Cyanobacteria in a lentic tropical environment, seeking to contribute to the knowledge on biodiversity and their distribution. This study was conducted at the Samambaia Reservoir, which is located at Federal University of Goiás, Goiânia, Central West region of Brazil. In general, the water of the Samambaia Reservoir is characterized as more turbid and the increased biochemical oxygen demand as well as a higher concentration of coliforms in the rainy season. Twenty six samples were collected, ten in the dry season (09/2010 and 11/2010; 07/2012) and ten in the rainy season (01/2011 and 03/2011; 01/2013). Periphyton was collected from stems of aquatic plants (Cyperaceae), which were in the marginal area of the reservoir. With the floristic survey, 38 taxa of Cyanobacteria were identified in periphyton of the Samambaia Reservoir. Phormidium (family Phormidiaceae) and Aphanocapsa (Merismopediaceae) are among genera with the highest species richness. Regarding morphological types, many species of filamentous cyanobacteria were identified, followed by colonial taxa. In relation to the frequency of occurrence and the seasonal period, 14 taxa were classified in the rare category, 12 in common category and 12 in constant category. Regarding the seasonal period, Cyanophyceae were the greatest wealth in the rainy season (97.4%).

A Comprehensive Network Integrating Signature Microbes and Crucial Soil Properties During Early Biological Soil Crust Formation on Tropical Reef Islands

“…According to a previous study, the earliest stage of biocrust formation in drylands is soil surface stabilization via filamentous Cyanobacteria ( Scott, 1982 ; Büdel et al, 2016 ). In this study, 39.2% of nodes (key OTUs) were belong to the phylum Cyanobacteria according to network analysis ( Figure 5 ), to affect BSC formation possibly by producing exopolysaccharides ( Bellezza et al, 2003 ; Felisberto and Souza, 2014 ), stabilizing erodible substrates ( Garcia-Pichel and Wojciechowski, 2009 ), and fixing CO 2 . Moreover, the BSC-specific bacteria_OTU17 (Erythrobacteraceae), OTU142 (Rubellimicrobium), OTU380 (Caulobacteraceae), OTU562 (Acetobacteraceae), OTU1263 (Acetobacteraceae), OTU14513 (Sphingomonadaceae), OTU31164 (Sphingomonadaceae), OTU8543 (Sphingomonadaceae), and OTU134 ( Sphingomonas ), account for 12.2% of the key OTUs, were potentially group of aerobic anoxygenic phototrophic bacteria ( Figure 5 ), which could promote the development of BSC in drylands ( Tang et al, 2018 , 2021 ).…”

Composition, frequency and seasonal distribution of periphytic microalgae in stretches of the Curiaú River, Amapá, Eastern Amazon

“…The second most representative taxonomic class was Cyanophyceae. This class is formed by microorganisms, also called Cyanobacteria, and usually configures one of the most found groups in phytoplankton and periphyton [36,37]. Cyanobacteria species, especially filamentous, are common in tropical aquatic ecosystems, growing in masses on the sediment or aquatic macrophytes, mainly in unpolluted environments [7], which may be the case in the sections studied in the Curiaú River.…”

Cyanobacteria from a Brazilian subtropical freshwater water body

“…Geographic distribution -The data referring to the geographic distribution of species in Brazil were based on Werner et al (2015a), and complemented with the publications of Rodrigues and Bicudo (2001), Fonseca andRodrigues (2005), Sant'Anna et al (2011), Alcântara et al (2011), Felisberto and Souza (2014), Werner et al (2015b), Moura et al (2017), Laux et al (2018), Rangel et al (2018).…”