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Rethinking the marine carbon cycle: Factoring in the multifarious lifestyles of microbes
TLDR
The challenges of understanding the role protists play in geochemical cycling in the oceans are reviewed, and researchers must bring the conceptual framework of systems biology into bigger “ecosystems biology” models that broadly capture the geochemical activities of interacting plankton networks. Expand
The role of mixotrophic protists in the biological carbon pump
TLDR
It is shown how the exclusion of an explicit mixotrophic component in studies of the pelagic microbial communities leads to a failure to capture the true dynamics of the carbon flow, and recommended inclusion of multi-nutrient mixotroph models within ecosystem studies. Expand
Mixotrophic organisms become more heterotrophic with rising temperature.
TLDR
The hypothesis that mixotrophs become more heterotrophic with rising temperature, which alters their functional role in food webs and the carbon cycle, is supported. Expand
Diverse, uncultivated bacteria and archaea underlying the cycling of dissolved protein in the ocean
TLDR
A particle-associated community actively cycling DON was discovered and many uncultivated free-living microbial taxa are newly implicated in the cycling of dissolved proteins affiliated with the Verrucomicrobia, Planctomycetes, Actinobacteria and Marine Group II (MGII) Euryarchaeota. Expand
Microcystins do not provide anti-herbivore defence against mixotrophic flagellates
TLDR
Grazing on the toxic cyanobacterium Microcystis aeruginosa found no indication of microcystins acting as a defence against mixotrophic flagellates, and the functional and numerical response of Ochromonas sp. Expand
Alternatives to vitamin B1 uptake revealed with discovery of riboswitches in multiple marine eukaryotic lineages
TLDR
It is demonstrated that one such alga, the major primary producer Emiliania huxleyi, grows on 4-amino-5-hydroxymethyl-2-methylpyrimidine (a thiamine precursor moiety) alone, although long thought dependent on exogenous sources ofThiamine, making vitamin control of phytoplankton blooms more complex than the current paradigm suggests. Expand
Defining Planktonic Protist Functional Groups on Mechanisms for Energy and Nutrient Acquisition: Incorporation of Diverse Mixotrophic Strategies.
TLDR
This work proposes a new functional grouping of planktonic protists in an eco-physiological context and incorporates these functional groups within a foodweb structure and shows that there is scope for significant changes in trophic dynamics depending on the protist functional type description. Expand
Do mixotrophs grow as photoheterotrophs? Photophysiological acclimation of the chrysophyte Ochromonas danica after feeding.
TLDR
It is hypothesized that the availability of alternative carbon and energy sources during mixotrophy allows a switch to photoheterotrophic growth, where the photosynthetic apparatus mainly provides energy but not fixed carbon. Expand
The effect of a mixotrophic chrysophyte on toxic and colony-forming cyanobacteria
TLDR
It is demonstrated that O chromonas usually occurs in lakes with Microcystis, and small scale experiments show that Ochromonas can strongly reduce the biomass of MicroCystis and its toxin content. Expand
A distinct lineage of giant viruses brings a rhodopsin photosystem to unicellular marine predators
TLDR
It is demonstrated that the rhodopsin shared by ChoanoViruses and PgV binds retinal and pumps protons when illuminated, indicating that light-dependent energy transfer systems are likely common components of giant viruses of photosynthetic and phagotrophic marine eukaryotes. Expand
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