Effects of UV radiation on the taxonomic composition of natural bacterioplankton communities from Bahía Engaño (Patagonia, Argentina)

Manrique, Julieta M.; Calvo, Andrea Y.; Halac, Silvana R.; Villafañe, Virginia E.; Jones, Leandro Roberto; Helbling, E. Walter

doi:10.1016/j.jphotobiol.2012.09.019

Cited by 20 publications

(10 citation statements)

References 67 publications

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“…High UVR sensitivity of SAR11 was attributed to the high A+T content (69%) reported for the genome of the representative member of this group, Pelagibacter ubique (Giovannoni et al 2005b). The UV sensitivity of the SAR11 group is also supported by recent observations of the disappearance of sequences affiliated to Pelagibacter in natural Patagonian bacterioplankton communities following an 8-day exposure to PAR, PAR+UVA, and PAR+UVA+UVB (Manrique et al 2012). Other studies, however, indicate stimulation of SAR11 activity by light, potentially associated with the presence of proteorhodopsins (Giovannoni et al 2005a;Mary et al 2008;Lami et al 2009).…”

Section: Effects Of Uvr In Marine Microbial Communitiessupporting

confidence: 60%

Interactive effects of global climate change and pollution on marine microbes: the way ahead

Coelho

Santos

Coimbra

et al. 2013

Ecology and Evolution

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Global climate change has the potential to seriously and adversely affect marine ecosystem functioning. Numerous experimental and modeling studies have demonstrated how predicted ocean acidification and increased ultraviolet radiation (UVR) can affect marine microbes. However, researchers have largely ignored interactions between ocean acidification, increased UVR and anthropogenic pollutants in marine environments. Such interactions can alter chemical speciation and the bioavailability of several organic and inorganic pollutants with potentially deleterious effects, such as modifying microbial-mediated detoxification processes. Microbes mediate major biogeochemical cycles, providing fundamental ecosystems services such as environmental detoxification and recovery. It is, therefore, important that we understand how predicted changes to oceanic pH, UVR, and temperature will affect microbial pollutant detoxification processes in marine ecosystems. The intrinsic characteristics of microbes, such as their short generation time, small size, and functional role in biogeochemical cycles combined with recent advances in molecular techniques (e.g., metagenomics and metatranscriptomics) make microbes excellent models to evaluate the consequences of various climate change scenarios on detoxification processes in marine ecosystems. In this review, we highlight the importance of microbial microcosm experiments, coupled with high-resolution molecular biology techniques, to provide a critical experimental framework to start understanding how climate change, anthropogenic pollution, and microbiological interactions may affect marine ecosystems in the future.

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Section: Effects Of Uvr In Marine Microbial Communitiessupporting

confidence: 60%

Interactive effects of global climate change and pollution on marine microbes: the way ahead

Coelho

Santos

Coimbra

et al. 2013

Ecology and Evolution

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“…The resistance of Roseovarius to oxidative stress could be explained by its content in carotenoids acting as a singlet oxygen quencher. The Rhodobacteraceae family, and more specifically the genus Nereida, was dominant in a bacterial community after exposure to the natural sunlight with UV radiation during 8 days (Manrique et al 2012). In this case, the changes in bacterial community can result not only from the response of bacteria to photo-oxidized DOM, but also to a selection of a bacterial community more resistant to UV radiation or more able to use the DOM produced by the phytoplankton species selected by UV radiation.…”

Section: Changes In Bacterial Composition In Response To Photochemicamentioning

confidence: 99%

Photoreactivity of riverine and phytoplanktonic dissolved organic matter and its effects on the dynamics of a bacterial community from the coastal Mediterranean Sea

Blanchet

Fernández

Joux

2018

Progress in Oceanography

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High solar radiation levels measured in the Mediterranean basin can result in photo-oxidation of dissolved organic matter (DOM) at the sea surface. The objective of the present study was to determine the effects of solar radiation on two contrasting sources of DOM (diatomderived DOM and riverine DOM) and to evaluate its effect on the growth and the composition of a bacterial community from the Mediterranean Sea. DOM was sequentially exposed to artificial solar radiation or kept in the dark and then added to microcosms containing coastal seawater. For both sources of DOM, light exposure induced photo-alterations by decreasing absorbance and fluorescence of colored dissolved organic matter. However, resulting effects on bacteria were contrasted. Photo-alteration of phytoplankton-derived DOM resulted in a lower bacterial growth during the three first days, without modifying the total dissolved organic carbon consumption. Moreover, after 3 days of incubation, the bacterial diversity as determined by 16S rRNA gene pyrosequencing, revealed that DOM phototransformation led to a higher relative abundance of Alphaproteobacteria and a lower relative abundance of Gammaproteobacteria. A limited number of operational taxonomic units (OTUs) (n=44) 2 explained 80% of the diversity changes between dark and the light treatments, with an equal number of positively and negatively affected OTUs. In contrast, the photobleaching measured on riverine DOM after sunlight exposure had no effect on both bacterial carbon cycling and composition during a 7-days biodegradation experiment. Our results demonstrate that the effects of solar radiation on DOM greatly differ according to the initial composition of DOM and that changes in bacterial composition, when occurred, showed diverse responses inside a same class of bacteria, underlying the necessity to use a sufficiently resolutive approach to describe them. A better understanding of the interactive effects of the biological degradation and the photoinduced degradation of DOM are required in the context of the global change affecting Mediterranean Sea.

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“…Contrastingly, heterotrophic bacterial community structure described by terminal restriction fragment length polimorphism (T-RFLP) appeared strongly related to PAR conditions in North Pacific waters (Van Mooy et al, 2004) and it varied along a gradient of sunlight exposure created by incubating the same initial lake water samples at different depths during 4–6 days (Langenheder et al, 2006). More recently, an analysis of 16S rDNA gene libraries from microcosms in Bahia Engaño (Patagonia) showed that 8 days of exposure led to clearly differentiated assemblages between samples exposed to full sunlight and those exposed to PAR + UVA or PAR alone (Manrique et al, 2012). In any case, the different experimental designs used in these studies (sample volumes ranging from 1 to 650 L, incubation times from 1 to 15 days, etc.…”

Section: Role Of Community Composition: Taxonomically Resolved Responmentioning

confidence: 99%

Away from darkness: a review on the effects of solar radiation on heterotrophic bacterioplankton activity

et al. 2013

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Heterotrophic bacterioplankton are main consumers of dissolved organic matter (OM) in aquatic ecosystems, including the sunlit upper layers of the ocean and freshwater bodies. Their well-known sensitivity to ultraviolet radiation (UVR), together with some recently discovered mechanisms bacteria have evolved to benefit from photosynthetically available radiation (PAR), suggest that natural sunlight plays a relevant, yet difficult to predict role in modulating bacterial biogeochemical functions in aquatic ecosystems. Three decades of experimental work assessing the effects of sunlight on natural bacterial heterotrophic activity reveal responses ranging from high stimulation to total inhibition. In this review, we compile the existing studies on the topic and discuss the potential causes underlying these contrasting results, with special emphasis on the largely overlooked influences of the community composition and the previous light exposure conditions, as well as the different temporal and spatial scales at which exposure to solar radiation fluctuates. These intricate sunlight-bacteria interactions have implications for our understanding of carbon fluxes in aquatic systems, yet further research is necessary before we can accurately evaluate or predict the consequences of increasing surface UVR levels associated with global change.

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Effects of UV radiation on the taxonomic composition of natural bacterioplankton communities from Bahía Engaño (Patagonia, Argentina)

Cited by 20 publications

References 67 publications

Interactive effects of global climate change and pollution on marine microbes: the way ahead

Interactive effects of global climate change and pollution on marine microbes: the way ahead

Photoreactivity of riverine and phytoplanktonic dissolved organic matter and its effects on the dynamics of a bacterial community from the coastal Mediterranean Sea

Away from darkness: a review on the effects of solar radiation on heterotrophic bacterioplankton activity

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