Effect of natural sunlight on bacterial activity and differential sensitivity of natural bacterioplankton groups in northwestern Mediterranean coastal waters

Article Abstract:

The effect of natural sunlight on marine bacterioplankton assemblages at the single-cell level was assessed in a highly UV transparent area of the Northwestern Mediterranean Sea. The possibility of UV radiation significantly affecting the in-situ single-cell activity of bacterioplankton was suggested and the different sensitivity to natural levels of incident solar radiation of naturally dominating phylogenetic bacterial groups was observed.

Mediterranean Sea, Environmental aspects, Ultraviolet radiation, Flow cytometry, Marine plankton

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Seasonal variations in the contributions of different bacterial groups to the uptake of low-molecular-weight compounds in northwestern Mediterranean coastal waters

Article Abstract:

The variations in the contributions of different bacterial groups to the uptake of low-molecular-weight compounds in northwestern Mediterranean coastal waters during a seasonal cycle are analyzed. The results show that substantial changes in the activity of some and not all groups of bacteria takes place every year.

Physiological aspects, Bacteria, Heterotrophic, Heterotrophic bacteria, Molecular weights

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Differential sunlight sensitivity of picophytoplankton from surface Mediterranean coastal waters

Article Abstract:

The sensitivity of coastal picophytoplankton exposed to natural sunlight in short-term experiments is tested. Cell abundance and cell-specific chlorophyll fluorescence were significantly reduced in Prochlorococcus spp. but not is Synechococcus, whereas picoeukaryotes had an intermediate response.

Eukaryotes, Chlorophyll, Phytoplankton

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