Publications by authors named "Inessa L Bagatini"
Reports of programmed cell death (PCD) in phytoplankton raise questions about the ecological evolutionary role of cell death in these organisms. We induced PCD by nitrogen deprivation and unregulated cell death (non-PCD) in one strain of the green microalga and investigated the effects of the cell death supernatants on phylogenetically related co-occurring organisms using growth rates and maximum biomass as proxies of fitness. PCD-released materials from CCMA-UFSCar-3 significantly increased growth rates of two conspecific strains compared to healthy culture (HC) supernatants and improved the maximum biomass of all strains compared to related species.
View Article and Find Full Text PDFThe biogeography of bacterial communities is a key topic in Microbial Ecology. Regarding continental water, most studies are carried out in the northern hemisphere, leaving a gap on microorganism's diversity patterns on a global scale. South America harbours approximately one third of the world's total freshwater resources, and is one of these understudied regions.
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- Local and regional factors influence the turnover of microbial communities, with local selection affecting assembly through interactions and regional factors impacting dispersion patterns.
- The study examined three microbial subcommunities in tropical freshwater reservoirs during dry and rainy seasons to understand how these conditions affect community composition.
- Findings revealed that selection played a significant role for free-living communities under dry conditions due to environmental heterogeneity, while cyanobacterial communities were more influenced by stochastic drift; each subcommunity exhibited unique turnover patterns based on diversity, lifestyle, and spatial dynamics.
Corrigendum to "Use of fatty acids in the chemotaxonomy of the family Selenastraceae (Sphaeropleales, Chlorophyceae)" [Phytochemistry 151 (2018) 9-16].
Phytochemistry
July 2021
Article Synopsis
- The study explores how local abundance of bacteria in freshwater lakes influences their overall distribution, focusing on both core and satellite operational taxonomic units (OTUs).
- The researchers conducted their analysis in southeastern Brazil, examining data from 60 shallow lakes to identify the bacterial communities present and their spatial abundance.
- Findings revealed a significant bimodal occupancy-frequency distribution influenced by environmental factors like pH and nutrients, emphasizing the connection between local conditions and microbial diversity across different habitats.
Article Synopsis
- Recent advances in cultural-independent methods and molecular tools have transformed our understanding of microbial diversity and ecology, although the impact of different DNA extraction methods remains unclear.
- This study compared the classical phenol:chloroform extraction method with the PowerSoil DNA isolation Kit across 15 shallow lakes to assess their effects on microbial community analyses.
- Findings showed that while only 5% of operational taxonomic units (OTUs) differed significantly between the methods, these differences significantly influenced community composition, indicating that results from the two methods are not directly comparable.
The family Selenastraceae includes many species of freshwater green microalgae with morphological characteristics that are so subtly different that it is difficult to discriminate species within it. Therefore, the use of the diacritical characteristics of traditional morphological taxonomy may be ineffective at differentiating among many species of the family. Chemotaxonomy based on fatty acid methyl ester (FAME) can help resolve uncertainties not completely addressed by other approaches, such as molecular studies of some species within the Selenastraceae.
View Article and Find Full Text PDFMany freshwater phytoplankton species have the potential to form transient nuisance blooms that affect water quality and other aquatic biota. Heterotrophic bacteria can influence such blooms via nutrient regeneration but also via antagonism and other biotic interactions. We studied the composition of bacterial communities associated with three bloom-forming freshwater phytoplankton species, the diatom Aulacoseira granulata and the cyanobacteria Microcystis aeruginosa and Cylindrospermopsis raciborskii.
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