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.

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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.

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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.

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