Ecologically relevant choanoflagellates collected from hypoxic water masses of the Baltic Sea have untypical mitochondrial cristae

@article{Wylezich2012EcologicallyRC,
  title={Ecologically relevant choanoflagellates collected from hypoxic water masses of the Baltic Sea have untypical mitochondrial cristae},
  author={Claudia Wylezich and Sergey A. Karpov and Alexander P. Mylnikov and Ruth Anderson and Klaus Jürgens},
  journal={BMC Microbiology},
  year={2012},
  volume={12},
  pages={271 - 271}
}
BackgroundProtist communities inhabiting oxygen depleted waters have so far been characterized through both microscopical observations and sequence based techniques. However, the lack of cultures for abundant taxa severely hampers our knowledge on the morphology, ecology and energy metabolism of hypoxic protists. Cultivation of such protists has been unsuccessful in most cases, and has never yet succeeded for choanoflagellates, even though these small bacterivorous flagellates are known to be… 

Figures and Tables from this paper

Culturing Heterotrophic Protists from the Baltic Sea: Mostly the “Usual Suspects” but a Few Novelties as Well
TLDR
Traditional cultivation techniques were applied to samples from coastal surface waters and from deep oxygen‐depleted waters of the Baltic Sea, resulting in 126 monoclonal cultures of heterotrophic protists that may represent novel taxa, either at the species level or at the genus level.
Morphological and molecular approaches reveal highly stratified protist communities along Baltic Sea pelagic redox gradients
TLDR
A multi-annual microscopy- based study combined in one year with 18S rRNA gene and transcript-based DGGE fingerprints to identify the dominant protist taxa and to assess their vertical distribution demonstrated strong stratifications of the protist community composition along the redox gradient.
Molecular identification of Nucleophaga terricolae sp. nov. (Rozellomycota), and new insights on the origin of the Microsporidia
TLDR
The 18S rDNA molecular phylogeny of an additional microsporidium-like endoparasite of amoebae, which has a developmental cycle almost identical to that of Nucleophaga amoEBae, is reported, and results show that the endoparsite is closely related to N. amoegae, forming a distinct species, for which the name is proposed, N nucleophaga terricolae.
Promiscuous and specific bacterial symbiont acquisition in the amoeboid genus Nuclearia (Opisthokonta).
TLDR
Strains of Nuclearia thermophila harboured the same endosymbiont even when isolated from different lakes, which is especially remarkable considering the phylogenetic position of these basal opisthokonts.
Extended phylogeny of the Craspedida (Choanomonada).
A six-gene phylogeny provides new insights into choanoflagellate evolution.
Phylogeny and evolutionary perspective of Opisthokonta protists
TLDR
The AAR gene seems to be exclusive of Excavata and Unikonts, whereas the lysA gene is present in several unrelated taxa within all major eukaryotic lineages, indicating a role for several lateral gene transfer (LGT) events.
...
1
2
3
...

References

SHOWING 1-10 OF 80 REFERENCES
Unveiling Trophic Functions of Uncultured Protist Taxa by Incubation Experiments in the Brackish Baltic Sea
TLDR
The results indicate that the heterotrophic flagellate community in the southwestern Baltic Sea is dominated by species of marine origin, and shed some light into the trophic role of diverse uncultured protists especially within functionally heterogeneous groups.
Microbial eukaryotes in the hypersaline anoxic L'Atalante deep-sea basin.
TLDR
It is hypothesized that extreme environments may exert a high selection pressure possibly resulting in the evolution of an exceptional and distinctive assemblage of protists in the deep hypersaline anoxic basins in the Mediterranean Sea.
Taming the smallest predators of the oceans
TLDR
It is shown how ecologically significant bacterivorous protists have been brought into culture by mimicking in situ conditions by inoculating into seawater amended with natural bacterial assemblage at nearly in situ abundances.
Protist diversity in suboxic and sulfidic waters of the Black Sea.
TLDR
Higher species diversity in the sulfidic zone and about twice as many novel sequence types of ciliates and stramenopiles compared with the suboxic layer emphasizes the importance of anoxic, sulfidIC waters as habitat for high protist diversity although the function of these organisms is yet unknown.
Ultrastructure and molecular phylogeny of Calkinsia aureus: cellular identity of a novel clade of deep-sea euglenozoans with epibiotic bacteria
TLDR
The authors' ultrastructural description of C. aureus possesses all of the synapomorphies for the Euglenozoa, but lacks traits that are specific to any of the three previously recognized euglenozoan subgroups.
Distribution of abundant prokaryotic organisms in the water column of the central Baltic Sea with an oxic-anoxic interface
Anoxic marine deeps are characterized by their chemically stratified water columns. This has implications for the vertical distribution of microbial assemblages, but knowledge of this distribution is
Relevance of a crenarchaeotal subcluster related to Candidatus Nitrosopumilus maritimus to ammonia oxidation in the suboxic zone of the central Baltic Sea
TLDR
This is the first study to show the dominance of only one crenarchaeotal nitrifying key cluster in a natural habitat, inside and outside the nitrification zone of a pelagic redoxcline.
Microeukaryote Community Patterns along an O2/H2S Gradient in a Supersulfidic Anoxic Fjord (Framvaren, Norway)
TLDR
A cultivation-independent 18S rRNA survey in the superanoxic Framvaren Fjord in Norway revealed the fine-scale architecture of anoxic protistan communities, which may exhibit adaptation to different environmental conditions along the steep O2/H2S gradient.
The ecology of Paraphysomonas imperforata based on studies employing oligonucleotide probe identification in coastal water samples and enrichment cultures
TLDR
The results support the notion that enrichment cultivation of heterotrophic flagellates, and perhaps incubations in general, can select for species such as P. imperforata that may not be representative of nanoplanktonic protists that numerically dominate natural assemblages.
...
1
2
3
4
5
...