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Aerobic anoxygenic phototrophs are highly abundant in hypertrophic and polyhumic waters
- Source :
- FEMS Microbiology Ecology. 95
- Publication Year :
- 2019
- Publisher :
- Oxford University Press (OUP), 2019.
-
Abstract
- Aerobic anoxygenic phototrophs (AAPs) are a group of photoheterotrophic bacteria common in natural waters. Here, AAP abundance and contribution to total bacterial abundance and biomass were investigated to test whether the trophic status of a lake or content of coloured dissolved organic matter (CDOM) play a role in determining AAP distribution and abundance in shallow inland lakes, with special focus on hypertrophic and polyhumic waters. Twenty-six different shallow lakes in Hungary were monitored. AAP abundance and biomass were determined by epifluorescence microscopy. The lakes exhibit a broad range of CDOM (2–7000 mg Pt L−1) and phytoplankton biomass (2–1200 μg L−1 chlorophyll a concentration). Very high AAP abundance (up to 3 × 107 cells mL−1) was observed in polyhumic and hypertrophic shallow lakes. AAP abundance was influenced by phytoplankton biomass and CDOM content, and these effects were interrelated. As determined, 40 μg L−1 chlorophyll a and 52 mg Pt L−1 CDOM are threshold levels above which these effects have a synergistic relationship. Hence, the observed high AAP abundance in some soda pans is a consequence of combined hypertrophy and high CDOM content. AAP contribution was influenced by total suspended solids (TSS) content: the success of AAP cells could be explained by high TSS levels, which might be explained by the decrease of their selective grazing control.
- Subjects :
- 0301 basic medicine
Chlorophyll a
030106 microbiology
Biology
Applied Microbiology and Biotechnology
Microbiology
03 medical and health sciences
chemistry.chemical_compound
Abundance (ecology)
Phytoplankton
Dissolved organic carbon
Biomass
Humic Substances
Hungary
Biomass (ecology)
Bacteria
Ecology
Phototroph
Chlorophyll A
Heterotrophic Processes
Anoxygenic photosynthesis
Lakes
Phototrophic Processes
Colored dissolved organic matter
030104 developmental biology
chemistry
Environmental chemistry
Water Microbiology
Subjects
Details
- ISSN :
- 15746941
- Volume :
- 95
- Database :
- OpenAIRE
- Journal :
- FEMS Microbiology Ecology
- Accession number :
- edsair.doi.dedup.....def8f1a25faf8f44ea52506e7c741393