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dc.contributor.authorRuiz-González, Clara-
dc.contributor.authorGalí, Martí-
dc.contributor.authorLefort, Thomas-
dc.contributor.authorCardelús, Clara-
dc.contributor.authorSimó, Rafel-
dc.contributor.authorGasol, Josep M.-
dc.date.accessioned2012-11-28T11:50:31Z-
dc.date.available2012-11-28T11:50:31Z-
dc.date.issued2012-09-
dc.identifier.citationLimnology and Oceanography 57(5): 1376-1388 (2012es_ES
dc.identifier.issn0024-3590-
dc.identifier.urihttp://hdl.handle.net/10261/61408-
dc.description13 pages, 7 figures, 2 tableses_ES
dc.description.abstractThe effect of photosynthetically available radiation (PAR; 400–700 nm) and ultraviolet radiation (UVR; 280–400 nm) on marine bacterial heterotrophic activity was assessed monthly throughout a seasonal cycle in Blanes Bay (northwestern Mediterranean Sea). Seawater samples amended with 3H-leucine were exposed to solar radiation under three radiation treatments: PAR + UVR (280–700 nm), PAR + UVA (320–700 nm), and PAR only. Parallel reference incubations in the dark and under a fixed artificial light source (PAR only) were also performed. Exposure to high UVR doses caused strong inhibition of 3H-leucine incorporation rates (LIR), whereas natural PAR doses did not cause overall significant effects. Within UVR, UVA radiation accounted for most of the reduction in LIR, and this effect was modulated by the proportionality of the experimental light to the previous light exposure history of the samples. Constant (artificial) PAR-only exposure led to a general but seasonally variable increase in bacterial heterotrophic production compared to the dark controls, with large increases in spring and lower changes during summer. This pattern was likely caused by the stimulation of the bacterial group Gammaproteobacteria, which showed higher numbers of cells active in 3H-leucine uptake after light exposure. Again, the previous light history of the samples seemed to partly explain the measured effects. Overall, our results show variable responses of bacterial activities to light manipulations, depending on seasonally changing light conditions and communities, and stress the importance of realistic simulation of light exposure conditions for ecosystem-relevant photobiological studies with microbial planktones_ES
dc.description.sponsorshipThis work has been supported by the Spanish Ministry of Science and Innovation through projects ‘‘Fuentes de Materia Orgánica, Diversidad microbiana y funcionamiento (Respiración y Uso del Carbono) del ecosistema marino pelágico costero’’–MODIVUS (Ciencias y Tecnologías Marinas–CTM2005-04795/MAR), ‘‘Surface Mixing Modulation of the Exposure to Solar Radiation’’–SUMMER (Ciencias y Tecnologías Marinas–CTM2008-03309/MAR) and by a Ph.D. studentship to C.R.-G.es_ES
dc.language.isoenges_ES
dc.publisherAssociation for the Sciences of Limnology and Oceanographyes_ES
dc.rightsopenAccesses_ES
dc.titleAnnual variability in light modulation of bacterial heterotrophic activity in surface northwestern Mediterranean waterses_ES
dc.typeArtículoes_ES
dc.identifier.doi10.4319/lo.2012.57.5.1376-
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttp://dx.doi.org/10.4319/lo.2012.57.5.1376es_ES
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