scholarly journals Oceanic heterotrophic flagellates are dominated by a few widespread taxa

2021 ◽  
Author(s):  
Aleix Obiol ◽  
Imer Muhovic ◽  
Ramon Massana
Keyword(s):  
Heterotrophic Flagellates

Shifts in cell size and community composition of bacterioplankton due to grazing by heterotrophic flagellates: evidence from a marine system

2019 ◽  
Vol 83 (3) ◽  
pp. 295-308
Author(s):  
MG Weinbauer ◽  
S Suominen ◽  
J Jezbera ◽  
ME Kerros ◽  
S Marro ◽  
...  
Keyword(s):  
Cell Size ◽  
Community Composition ◽  
Heterotrophic Flagellates ◽  
Marine System

scholarly journals SIMULATION AND EXPERIMENT OF EXTINCTION OR ADAPTATION OF BIOLOGICAL SPECIES AFTER TEMPERATURE CHANGES

2005 ◽  
Vol 16 (03) ◽  
pp. 389-392 ◽  
Author(s):  
D. STAUFFER ◽  
H. ARNDT
Keyword(s):  
Sexual Reproduction ◽  
Temperature Change ◽  
Biological Species ◽  
Biological Aging ◽  
Heterotrophic Flagellates ◽  
Temperature Changes ◽  
Penna Model ◽  
Simulation And Experiment ◽  
Unicellular Organisms

Can unicellular organisms survive a drastic temperature change, and adapt to it after many generations? In simulations of the Penna model of biological aging, both extinction and adaptation were found for asexual and sexual reproduction as well as for parasex. These model investigations are the basis for the design of evolution experiments with heterotrophic flagellates.

Grazing of heterotrophic flagellates on viruses is driven by feeding behaviour

2013 ◽  
Vol 6 (4) ◽  
pp. 325-330 ◽  
Author(s):  
Li Deng ◽  
Steffen Krauss ◽  
Judith Feichtmayer ◽  
Roland Hofmann ◽  
Hartmut Arndt ◽  
...  
Keyword(s):  
Feeding Behaviour ◽  
Heterotrophic Flagellates

scholarly journals Evolutionary diversification of tiny ocean predators

2020 ◽  
Author(s):  
Francisco Latorre ◽  
Ina M. Deutschmann ◽  
Aurelie Labarre ◽  
Aleix Obiol ◽  
Anders Krabberød ◽  
...  
Keyword(s):  
Single Cells ◽  
Prey Type ◽  
Distribution Patterns ◽  
Trophic Levels ◽  
Glycoside Hydrolases ◽  
Global Ocean ◽  
Heterotrophic Flagellates ◽  
Evolutionary Diversification ◽  
Niche Adaptation ◽  
Different Temperatures

ABSTRACTUnicellular eukaryotic predators have a crucial role in the functioning of the ocean ecosystem by recycling nutrients and energy that are channeled to upper trophic levels. Traditionally, these evolutionary-diverse organisms have been combined into a single functional group (Heterotrophic flagellates), overlooking their organismal differences. Here we investigate four evolutionary related species belonging to one cosmopolitan family of uncultured marine picoeukaryotic predators: MAST-4 (species A, B, C, and E). Co-occurrence and distribution analyses in the global surface ocean indicated contrasting patterns in MAST-4A & C, suggesting adaptation to different temperatures. We then investigated whether these spatial distribution patterns were mirrored by MAST-4 genomic content using Single-Cell Genomics. Analyses of 69 single-cells recovered 66-83% of the MAST-4A/B/C/E genomes, which displayed substantial inter-species divergence. MAST-4 genomes were similar in terms of broad gene functional categories, but they differed in enzymes of ecological relevance, such as glycoside hydrolases (GHs), which are part of the food degradation machinery in MAST-4. Interestingly, MAST-4 species featuring a similar GH composition co-excluded each other (A & C) in the surface global ocean, while species with a different set of GHs appeared to be able to co-exist (species B & C) suggesting further niche diversification associated to prey digestion. We propose that differential niche adaptation to temperature and prey type has promoted adaptive evolutionary diversification in MAST-4. Altogether, we show that minute ocean predators from the same family may have different biogeography and genomic content, which need to be accounted to better comprehend marine food webs.

scholarly journals Catalase and Ascorbate Peroxidase in Euglenozoan Protists

Pathogens ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 317 ◽  
Author(s):  
Ingrid Škodová-Sveráková ◽  
Kristína Záhonová ◽  
Barbora Bučková ◽  
Zoltán Füssy ◽  
Vyacheslav Yurchenko ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Ascorbate Peroxidase ◽  
Biochemical Properties ◽  
Heterotrophic Flagellates ◽  
Oxygen Species ◽  
Detoxifying Enzymes ◽  
Free Living ◽  
Present Evidence ◽  
Obligate Parasites ◽  
Membrane Bound

In this work, we studied the biochemical properties and evolutionary histories of catalase (CAT) and ascorbate peroxidase (APX), two central enzymes of reactive oxygen species detoxification, across the highly diverse clade Eugenozoa. This clade encompasses free-living phototrophic and heterotrophic flagellates, as well as obligate parasites of insects, vertebrates, and plants. We present evidence of several independent acquisitions of CAT by horizontal gene transfers and evolutionary novelties associated with the APX presence. We posit that Euglenozoa recruit these detoxifying enzymes for specific molecular tasks, such as photosynthesis in euglenids and membrane-bound peroxidase activity in kinetoplastids and some diplonemids.

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