Contrasting effects of solar radiation and nitrates on the bioavailability of dissolved organic matter to marine bacteria. Tedetti, M., Joux, F., Charrière, B., Mopper, K., & Sempéré, R. Journal of Photochemistry and Photobiology A: Chemistry, 201(2):243–247, January, 2009. Number: 2![Contrasting effects of solar radiation and nitrates on the bioavailability of dissolved organic matter to marine bacteria [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex We evaluated the role of nitrate (NO3−) as a potential photosensitizer and the bacterial responses to dissolved organic matter (DOM) phototransformation from coastal waters in the northwestern Mediterranean Sea. In spring, without any addition of NO3−, the exposure of 0.2μm filtered seawater (DOM-solution) to natural solar radiation (i.e. Full Sun [FS], including photosynthetically available [PAR: 400–700nm], ultraviolet-A [UVAR: 315–400nm] and ultraviolet-B [UVBR: 280–315nm] radiations) stimulated bacterial production (BP) and abundance (BA) in natural assemblages (0.8μm filtered seawater) by 80 and 20% as compared to unexposed (Dark) DOM-solutions, respectively. This stimulation resulted primarily from the exposure to PAR. When NO3− (30μM) was added to DOM-solution before irradiation, BP and BA increased by 150 and 65% in FS compared to Dark, respectively, due to both PAR and UVBR. By contrast, in summer, the exposure of DOM-solution caused a decrease in BP by 30% but an increase in BA by 23% in FS compared to Dark, regardless of the NO3− addition before irradiation. The inhibition of BP resulted mainly from UVAR, whereas the stimulation of BA resulted from PAR. These results suggest contrasting effects along seasons of solar radiation and NO3− on DOM bioavailability, depending on its initial chemical composition.
@article{tedetti_contrasting_2009,
title = {Contrasting effects of solar radiation and nitrates on the bioavailability of dissolved organic matter to marine bacteria},
volume = {201},
issn = {1010-6030},
url = {http://www.sciencedirect.com/science/article/pii/S101060300800467X},
doi = {10.1016/j.jphotochem.2008.11.002},
abstract = {We evaluated the role of nitrate (NO3−) as a potential photosensitizer and the bacterial responses to dissolved organic matter (DOM) phototransformation from coastal waters in the northwestern Mediterranean Sea. In spring, without any addition of NO3−, the exposure of 0.2μm filtered seawater (DOM-solution) to natural solar radiation (i.e. Full Sun [FS], including photosynthetically available [PAR: 400–700nm], ultraviolet-A [UVAR: 315–400nm] and ultraviolet-B [UVBR: 280–315nm] radiations) stimulated bacterial production (BP) and abundance (BA) in natural assemblages (0.8μm filtered seawater) by 80 and 20\% as compared to unexposed (Dark) DOM-solutions, respectively. This stimulation resulted primarily from the exposure to PAR. When NO3− (30μM) was added to DOM-solution before irradiation, BP and BA increased by 150 and 65\% in FS compared to Dark, respectively, due to both PAR and UVBR. By contrast, in summer, the exposure of DOM-solution caused a decrease in BP by 30\% but an increase in BA by 23\% in FS compared to Dark, regardless of the NO3− addition before irradiation. The inhibition of BP resulted mainly from UVAR, whereas the stimulation of BA resulted from PAR. These results suggest contrasting effects along seasons of solar radiation and NO3− on DOM bioavailability, depending on its initial chemical composition.},
number = {2},
urldate = {2019-04-16},
journal = {Journal of Photochemistry and Photobiology A: Chemistry},
author = {Tedetti, Marc and Joux, Fabien and Charrière, Bruno and Mopper, Kenneth and Sempéré, Richard},
month = jan,
year = {2009},
note = {Number: 2},
keywords = {Mediterranean Sea, Bacterial production, Bacterial abundance, Dissolved organic matter, Nitrate, Phototransformation, Solar radiation},
pages = {243--247}
}
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In spring, without any addition of NO3−, the exposure of 0.2μm filtered seawater (DOM-solution) to natural solar radiation (i.e. Full Sun [FS], including photosynthetically available [PAR: 400–700nm], ultraviolet-A [UVAR: 315–400nm] and ultraviolet-B [UVBR: 280–315nm] radiations) stimulated bacterial production (BP) and abundance (BA) in natural assemblages (0.8μm filtered seawater) by 80 and 20\\% as compared to unexposed (Dark) DOM-solutions, respectively. This stimulation resulted primarily from the exposure to PAR. When NO3− (30μM) was added to DOM-solution before irradiation, BP and BA increased by 150 and 65\\% in FS compared to Dark, respectively, due to both PAR and UVBR. By contrast, in summer, the exposure of DOM-solution caused a decrease in BP by 30\\% but an increase in BA by 23\\% in FS compared to Dark, regardless of the NO3− addition before irradiation. The inhibition of BP resulted mainly from UVAR, whereas the stimulation of BA resulted from PAR. 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