Rethinking the marine carbon cycle: Factoring in the multifarious lifestyles of microbes
- A. Worden, M. Follows, S. Giovannoni, Susanne Wilken, A. Zimmerman, P. Keeling
- Environmental Science, BiologyScience
- 13 February 2015
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.
The role of mixotrophic protists in the biological carbon pump
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.
Defining Planktonic Protist Functional Groups on Mechanisms for Energy and Nutrient Acquisition: Incorporation of Diverse Mixotrophic Strategies.
Mixotrophic organisms become more heterotrophic with rising temperature.
- Susanne Wilken, J. Huisman, Suzanne Naus-Wiezer, E. van Donk
- Environmental ScienceEcology Letters
- 1 February 2013
The hypothesis that mixotrophs become more heterotrophic with rising temperature, which alters their functional role in food webs and the carbon cycle, is supported.
Alternatives to vitamin B1 uptake revealed with discovery of riboswitches in multiple marine eukaryotic lineages
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.
The effect of a mixotrophic chrysophyte on toxic and colony-forming cyanobacteria
- E. Donk, S. Cerbin, Susanne Wilken, N. Helmsing, R. Ptáčník, A. Verschoor
- Biology, Environmental Science
- 1 September 2009
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.
Diverse, uncultivated bacteria and archaea underlying the cycling of dissolved protein in the ocean
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.
Microcystins do not provide anti-herbivore defence against mixotrophic flagellates
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.
Comparison of predator-prey interactions with and without intraguild predation by manipulation of the nitrogen source
- Susanne Wilken, J. Verspagen, Suzanne Naus-Wiezer, E. Donk, J. Huisman
- Environmental Science
- 1 April 2014
It is found that the mixotrophic chrysophyte Ochromonas can grow autotrophically on ammonium, but not on nitrate, indicating that intraguild predation may enable biological control of microbial pest species.
Biological control of toxic cyanobacteria by mixotrophic predators: an experimental test of intraguild predation theory.
- Susanne Wilken, J. Verspagen, Suzanne Naus-Wiezer, E. van Donk, J. Huisman
- Environmental Science, BiologyEcological Applications
- 1 July 2014
The results illustrate the potential of intraguild predation to control pest species, but also show that the effectiveness of their biological control can be reduced in productive environments.