In aquatic environments heterotrophic flagellates are an important component within the microbial loop and the food web, owing to their involvement in the energy transfer and flux and as an intermediate link between bacteria and primary producers, and greater organisms, such as other protists and metazoan consumers. In the microbial loop heterotrophic flagellates highly contribute to fast biomass and nutrient recycling and to the production in aquatic environments. In fact, these protists consume efficiently viruses, bacteria, cyanobacteria and picophytoplankton, and are grazed mainly by other protists, rotifers and small crustaceans. In this paper the knowledge about these unicellular organisms is reviewed, taking into particular account their ecological relationships and trophic role within the plankton community of marine and freshwater environments.
Download full-text PDF |
Source |
---|
Mol Phylogenet Evol
January 2025
Charles University, Faculty of Science, Department of Zoology, Prague, Czechia.
The phylum Heterolobosea Page and Blanton, 1985 is a group of eukaryotes that contains heterotrophic flagellates, amoebae, and amoeboflagellates, including the infamous brain-eating amoeba Naegleria fowleri. In this study, we investigate the deep evolutionary history of Heterolobosea by generating and analyzing transcriptome data from 16 diverse isolates and combine this with previously published data in a comprehensive phylogenomic analysis. This dataset has representation of all but one of the major lineages classified here as orders.
View Article and Find Full Text PDFEur J Protistol
October 2024
Department of Botany, Faculty of Science, University of South Bohemia in České Budějovice, České Budějovice, Czech Republic; Třeboň Experimental Garden and Gene Pool Collections, Institute of Botany of the CAS, Třeboň, Czech Republic.
This review aims to compile sparse information on the ecology of freshwater heterotrophic euglenoids and synthesize the main phenomena and hypotheses from published results. Apparently, heterotrophic euglenoids play a very important role in the nutrient flow of water ecosystems and are irreplaceable heterotrophic contributors in benthic communities, as their total biomass is by far the largest among heterotrophic flagellates. Even though they are obviously a very crucial part of the diversity of freshwater heterotrophic protists, and likely the most represented (in terms of biovolume) group of heterotrophic flagellates, there have been only a few attempts to elucidate their ecological preferences, roles, niches, and importance.
View Article and Find Full Text PDFCurr Biol
January 2025
Ecologie Systématique Evolution, CNRS, Université Paris-Saclay, AgroParisTech, 91190 Gif-sur-Yvette, France. Electronic address:
Eukaryotes evolved from prokaryotic predecessors in the early Proterozoic and radiated from their already complex last common ancestor, diversifying into several supergroups with unresolved deep evolutionary connections. They evolved extremely diverse lifestyles, playing crucial roles in the carbon cycle. Heterotrophic flagellates are arguably the most diverse eukaryotes and often occupy basal positions in phylogenetic trees.
View Article and Find Full Text PDFISME J
January 2024
Department of Aquatic Microbial Ecology, Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences, 37005, České Budějovice, Czech Republic.
PeerJ
September 2024
Department Biodiversity, University of Duisburg-Essen, Essen, North Rhine Westphalia, Germany.
The increasing frequency and intensity of heatwaves driven by climate change significantly impact microbial communities in freshwater habitats, particularly eukaryotic microorganisms. Heterotrophic nanoflagellates are important bacterivorous grazers and play a crucial role in aquatic food webs, influencing the morphological and taxonomic structure of bacterial communities. This study investigates the responses of three flagellate taxa to heatwave conditions through single-strain and mixed culture experiments, highlighting the impact of both biotic and abiotic factors on functional redundancy between morphologically similar protist species under thermal stress.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!