A Crispy Diet: Grazers of Achromatium oxaliferum in Lake Stechlin Sediments
| Autor: | Sina Schorn, Heribert Cypionka |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Geologic Sediments Meiobenthos 030106 microbiology Soil Science Zoology Calcofluor-white Predation Oligochetes 03 medical and health sciences Microbial ecology Aquatic fungi Animals Achromatium Ciliophora Oligochaeta Amoeba Ecology Evolution Behavior and Systematics Ciliates Gram-Negative Aerobic Bacteria Ecology biology Slime layer Sporangium Large sulfur bacteria Amoebae Note biology.organism_classification Lakes 030104 developmental biology Plathelminthes Bacteria |
| Zdroj: | Microbial Ecology |
| ISSN: | 1432-184X 0095-3628 |
| DOI: | 10.1007/s00248-018-1158-4 |
| Popis: | Achromatium is the largest freshwater bacterium known to date and easily recognised by conspicuous calcite bodies filling the cell volume. Members of this genus are highly abundant in diverse aquatic sediments and may account for up to 90% of the bacterial biovolume in the oxic-anoxic interfaces. The high abundance implies that Achromatium is either rapidly growing or hardly prone to predation. As Achromatium is still uncultivated and does not appear to grow fast, one could assume that the cells might escape predation by their unusual shape and composition. However, we observed various members of the meiofauna grazing or parasitizing on Achromatium. By microphotography, we documented amoebae, ciliates, oligochetes and plathelminthes having Achromatium cells ingested. Some Achromatium cells harboured structures resembling sporangia of parasitic fungi (chytrids) that could be stained with the chitin-specific dye Calcofluor White. Many Achromatia carried prokaryotic epibionts in the slime layer surrounding the cells. Their regular distribution over the cell might indicate that they are commensalistic rather than harming their hosts. In conclusion, we report on various interactions of Achromatium with the sediment community and show that although Achromatium cells are a crispy diet, full of calcite bodies, predators do not spare them. |
| Databáze: | OpenAIRE |
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