Priming of microcystin degradation in carbon-amended membrane biofilm communities is promoted by oxygen-limited conditions
| Autor: | Marisa O.D. Silva, Jakob Pernthaler |
|---|---|
| Přispěvatelé: | University of Zurich |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Microcystis Microcystins Bacterial Toxins microbial communities Biomass Microcystin Applied Microbiology and Biotechnology 010501 environmental sciences 580 Plants (Botany) 01 natural sciences Microbiology 03 medical and health sciences 10126 Department of Plant and Microbial Biology 2402 Applied Microbiology and Biotechnology Microcystis aeruginosa Food science 10211 Zurich-Basel Plant Science Center bacteria microcystin degradation 0105 earth and related environmental sciences Diatoms chemistry.chemical_classification biology Ecology habitat priming 2404 Microbiology oxygen-limited conditions Biofilm Cyanotoxin biology.organism_classification Carbon 6. Clean water Oxygen 030104 developmental biology Productivity (ecology) chemistry Biofilms 2303 Ecology Bacteria Research Article |
| Zdroj: | FEMS Microbiology Ecology |
| Popis: | Microbial biofilms are an important element of gravity-driven membrane (GDM) filtration systems for decentralized drinking water production. Mature biofilms fed with biomass from the toxic cyanobacterium Microcystis aeruginosa efficiently remove the cyanotoxin microcystin (MC). MC degradation can be ‘primed’ by prior addition of biomass from a non-toxic M. aeruginosa strain. Increased proportions of bacteria with an anaerobic metabolism in M. aeruginosa-fed biofilms suggest that this ‘priming’ could be due to higher productivity and the resulting changes in habitat conditions. We, therefore, investigated GDM systems amended with the biomass of toxic (WT) or non-toxic (MUT) M. aeruginosa strains, of diatoms (DT), or with starch solution (ST). After 25 days, these treatments were changed to receiving toxic cyanobacterial biomass. MC degradation established significantly more rapidly in MUT and ST than in DT. Oxygen measurements suggested that this was due to oxygen-limited conditions in MUT and ST already prevailing before addition of MC-containing biomass. Moreover, the microbial communities in the initial ST biofilms featured high proportions of facultative anaerobic taxa, whereas aerobes dominated in DT biofilms. Thus, the ‘priming’ of MC degradation in mature GDM biofilms seems to be related to the prior establishment of oxygen-limited conditions mediated by higher productivity. The degradation of a cyanobacterial toxin by microbial biofilms of a small-scale drinking water filtration system is favored by the prior establishment of oxygen-limited conditions. |
| Databáze: | OpenAIRE |
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