Adaptation of Coccomyxa sp. to Extremely Low Light Conditions Causes Deep Chlorophyll and Oxygen Maxima in Acidic Pit Lakes

Deep chlorophyll maxima (DCM) and metalimnetic oxygen maxima (MOM) are outstanding biogeochemical features of acidic pit lakes (APL). However, knowledge of the eukaryotic phototrophs responsible for their formation is limited. We aimed at linking the dynamics of phototrophic communities inhabiting m...

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Bibliographic Details
Published in:Microorganisms (Basel) 2020-08, Vol.8 (8), p.1218
Main Authors: Sánchez-España, Javier, Falagán, Carmen, Ayala, Diana, Wendt-Potthoff, Katrin
Format: Article
Language:English
Subjects:
Acclimation
Acclimatization
Acidic lakes
acidophiles
Carbon
Chlorophyll
Coccomyxa
Community composition
Cyanobacteria
deep chlorophyll maxima
dissolved oxygen
green algae
Lakes
Light
Microorganisms
Nutrient concentrations
Nutrient uptake
Oxygen
Oxygen production
Photosynthesis
Photosynthetically active radiation
Phytoplankton
Pigments
Water temperature
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Summary:Deep chlorophyll maxima (DCM) and metalimnetic oxygen maxima (MOM) are outstanding biogeochemical features of acidic pit lakes (APL). However, knowledge of the eukaryotic phototrophs responsible for their formation is limited. We aimed at linking the dynamics of phototrophic communities inhabiting meromictic APL in Spain with the formation of these characteristic layers. Firstly, the dynamics of DCM and MOM and their relation to physico-chemical parameters (photosynthetically active radiation (PAR), pH, dissolved ferric iron concentration, temperature), pigments and nutrient distribution is described; secondly, the phototrophic community composition is studied through a combination of microscopy, biomolecular and "omics" tools. Phototrophic communities of the studied APL show a low diversity dominated by green microalgae, specifically sp., which have been successfully adapted to the chemically harsh conditions. DCM and MOM are usually non-coincident. DCM correspond to layers where phototrophs have higher chlorophyll content per cell to cope with extremely low PAR (
ISSN:2076-2607
2076-2607
DOI:10.3390/microorganisms8081218