Journal
FEMS MICROBIOLOGY ECOLOGY
Volume 92, Issue 5, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/femsec/fiw048
Keywords
dissolved organic matter; solar radiation; bacterial diversity; bacterial carbon demand; bacterial growth efficiency
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Funding
- Swansea University Research Fund
- EUROMARINE Fellowship
- Australian Institute of Marine Science
- CSIC Program 'Junta para la Ampliacion de Estudios' - ESF
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The impact of solar radiation on dissolved organic matter (DOM) derived from 3 different sources (seawater, eelgrass leaves and river water) and the effect on the bacterial carbon cycling and diversity were investigated. Seawater with DOM from the sources was first either kept in the dark or exposed to sunlight (4 days), after which a bacterial inoculum was added and incubated for 4 additional days. Sunlight exposure reduced the coloured DOM and carbon signals, which was followed by a production of inorganic nutrients. Bacterial carbon cycling was higher in the dark compared with the light treatment in seawater and river samples, while higher levels were found in the sunlight-exposed eelgrass experiment. Sunlight pre-exposure stimulated the bacterial growth efficiency in the seawater experiments, while no impact was found in the other experiments. We suggest that these responses are connected to differences in substrate composition and the production of free radicals. The bacterial community that developed in the dark and sunlight pre-treated samples differed in the seawater and river experiments. Our findings suggest that impact of sunlight exposure on the bacterial carbon transfer and diversity depends on the DOM source and on the sunlight-induced production of inorganic nutrients.
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