AI Article Synopsis
- Seasonal changes in light and groundwater chemistry significantly impact the structure and function of cyanobacterial mats, particularly in the Middle Island Sinkhole (MIS).
- These changes lead to shifts in dominant cyanobacteria species, from Phormidium in summer to Planktothrix in autumn, accompanied by increased populations of diatoms and various sulfur-related bacteria.
- The presence of specialized light-harvesting proteins in cyanobacteria and higher abundance of Beggiatoa sulfur oxidation proteins in autumn suggest physiological adaptations to seasonal light variations, indicating strong interactions among different microbial groups affecting biogeochemical processes in these ecosystems.
Article Abstract
Seasonal changes in light and physicochemical conditions have strong impacts on cyanobacteria, but how they affect community structure, metabolism, and biogeochemistry of cyanobacterial mats remains unclear. Light may be particularly influential for cyanobacterial mats exposed to sulphide by altering the balance of oxygenic photosynthesis and sulphide-driven anoxygenic photosynthesis. We studied temporal shifts in irradiance, water chemistry, and community structure and function of microbial mats in the Middle Island Sinkhole (MIS), where anoxic and sulphate-rich groundwater provides habitat for cyanobacteria that conduct both oxygenic and anoxygenic photosynthesis. Seasonal changes in light and groundwater chemistry were accompanied by shifts in bacterial community composition, with a succession of dominant cyanobacteria from Phormidium to Planktothrix, and an increase in diatoms, sulphur-oxidizing bacteria, and sulphate-reducing bacteria from summer to autumn. Differential abundance of cyanobacterial light-harvesting proteins likely reflects a physiological response of cyanobacteria to light level. Beggiatoa sulphur oxidation proteins were more abundant in autumn. Correlated abundances of taxa through time suggest interactions between sulphur oxidizers and sulphate reducers, sulphate reducers and heterotrophs, and cyanobacteria and heterotrophs. These results support the conclusion that seasonal change, including light availability, has a strong influence on community composition and biogeochemical cycling of sulphur and O in cyanobacterial mats.
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| http://dx.doi.org/10.1111/1462-2920.16480 | DOI Listing |
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