Annual variability in light modulation of bacterial heterotrophic activity in surface northwestern Mediterranean waters

Annual variability in light modulation of bacterial heterotrophic activity in surface northwestern Mediterranean waters

13 pages, 7 figures, 2 tables

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Main Authors: Ruiz-González, Clara, Galí, Martí, Lefort, Thomas, Cardelús, Clara, Simó, Rafel, Gasol, Josep M.
Format: artículo biblioteca
Language:English
Published: Association for the Sciences of Limnology and Oceanography 2012-09
Online Access:http://hdl.handle.net/10261/61408
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spelling dig-icm-es-10261-614082020-11-27T18:54:36Z Annual variability in light modulation of bacterial heterotrophic activity in surface northwestern Mediterranean waters Ruiz-González, Clara Galí, Martí Lefort, Thomas Cardelús, Clara Simó, Rafel Gasol, Josep M. 13 pages, 7 figures, 2 tables The 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 plankton This 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. Peer reviewed 2012-11-28T11:50:31Z 2012-11-28T11:50:31Z 2012-09 artículo http://purl.org/coar/resource_type/c_6501 Limnology and Oceanography 57(5): 1376-1388 (2012 0024-3590 http://hdl.handle.net/10261/61408 10.4319/lo.2012.57.5.1376 en https://doi.org/10.4319/lo.2012.57.5.1376 open Association for the Sciences of Limnology and Oceanography
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
description 13 pages, 7 figures, 2 tables
format artículo
author Ruiz-González, Clara
Galí, Martí
Lefort, Thomas
Cardelús, Clara
Simó, Rafel
Gasol, Josep M.
spellingShingle Ruiz-González, Clara
Galí, Martí
Lefort, Thomas
Cardelús, Clara
Simó, Rafel
Gasol, Josep M.
Annual variability in light modulation of bacterial heterotrophic activity in surface northwestern Mediterranean waters
author_facet Ruiz-González, Clara
Galí, Martí
Lefort, Thomas
Cardelús, Clara
Simó, Rafel
Gasol, Josep M.
author_sort Ruiz-González, Clara
title Annual variability in light modulation of bacterial heterotrophic activity in surface northwestern Mediterranean waters
title_short Annual variability in light modulation of bacterial heterotrophic activity in surface northwestern Mediterranean waters
title_full Annual variability in light modulation of bacterial heterotrophic activity in surface northwestern Mediterranean waters
title_fullStr Annual variability in light modulation of bacterial heterotrophic activity in surface northwestern Mediterranean waters
title_full_unstemmed Annual variability in light modulation of bacterial heterotrophic activity in surface northwestern Mediterranean waters
title_sort annual variability in light modulation of bacterial heterotrophic activity in surface northwestern mediterranean waters
publisher Association for the Sciences of Limnology and Oceanography
publishDate 2012-09
url http://hdl.handle.net/10261/61408
work_keys_str_mv AT ruizgonzalezclara annualvariabilityinlightmodulationofbacterialheterotrophicactivityinsurfacenorthwesternmediterraneanwaters
AT galimarti annualvariabilityinlightmodulationofbacterialheterotrophicactivityinsurfacenorthwesternmediterraneanwaters
AT lefortthomas annualvariabilityinlightmodulationofbacterialheterotrophicactivityinsurfacenorthwesternmediterraneanwaters
AT cardelusclara annualvariabilityinlightmodulationofbacterialheterotrophicactivityinsurfacenorthwesternmediterraneanwaters
AT simorafel annualvariabilityinlightmodulationofbacterialheterotrophicactivityinsurfacenorthwesternmediterraneanwaters
AT gasoljosepm annualvariabilityinlightmodulationofbacterialheterotrophicactivityinsurfacenorthwesternmediterraneanwaters
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