Microbial population in cloud water at the Puy de Dôme: Implications for the chemistry of clouds

Amato, Pierre; Ménager, Matthieu; Sancelme, Martine; Laj, Paolo; Mailhot, Gilles; Delort, Anne-Marie

doi:10.1016/j.atmosenv.2005.04.002

Cited by 176 publications

(168 citation statements)

References 29 publications

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“…In addition, bacterial and fungal OTUs characterizing atmospheric deposition (rain and aeolian dust) consisted of either pathogenic epiphytic (Aureobasidium) or highly versatile microorganisms (Methylobacterium, Pseudomonas and Sphingomonas) predominantly associated with plants (Vorholt, 2012). Representatives of these bacterial genera have also been found in cloud droplets (Amato et al, 2005), in hailstones (Šantl-Temkiv et al, 2012) and in aerosols collected at high altitude (Bowers et al, 2012). Similarly, OTUs present in snow, such as representatives of the Chlamydomonadaceae and Acetobacteraceae families, were mostly absent from other endogenous glacial habitats or barren soils.…”

Section: Origin Of Microbial Pioneers In Deglaciated Soilsmentioning

confidence: 96%

“…However, recent studies have reported that the atmosphere harbours complex and viable microbial communities (Vaïtilingom et al, 2010;Šantl-Temkiv et al, 2012;Stres et al, 2013). For example, Amato et al (2005) isolated active bacteria and fungi from cloud droplets. Similarly, Šantl-Temkiv et al (2013) reported that viable methane-oxidizing bacteria were found in rain and Favet et al (2013) retrieved living algae (for example, Chlorella) and fungi (for example, Aspergillus) in wind-blown desert dust.…”

Section: Introductionmentioning

confidence: 99%

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Potential sources of microbial colonizers in an initial soil ecosystem after retreat of an alpine glacier

2016

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Rapid disintegration of alpine glaciers has led to the formation of new terrain consisting of mineral debris colonized by microorganisms. Despite the importance of microbial pioneers in triggering the formation of terrestrial ecosystems, their sources (endogenous versus exogenous) and identities remain elusive. We used 454-pyrosequencing to characterize the bacterial and fungal communities in endogenous glacier habitats (ice, sub-, supraglacial sediments and glacier stream leaving the glacier forefront) and in atmospheric deposition (snow, rain and aeolian dust). We compared these microbial communities with those occurring in recently deglaciated barren soils before and after snow melt (snow-covered soil and barren soil). Atmospheric bacteria and fungi were dominated by plant-epiphytic organisms and differed from endogenous glacier habitats and soils indicating that atmospheric input of microorganisms is not a major source of microbial pioneers in newly formed soils. We found, however, that bacterial communities in newly exposed soils resembled those of endogenous habitats, which suggests that bacterial pioneers originating from sub-and supraglacial sediments contributed to the colonization of newly exposed soils. Conversely, fungal communities differed between habitats suggesting a lower dispersal capability than bacteria. Yeasts putatively adapted to cold habitats characteristic of snow and supraglacial sediments were similar, despite the fact that these habitats were not spatially connected. These findings suggest that environmental filtering selects particular fungi in cold habitats. Atmospheric deposition provided important sources of dissolved organic C, nitrate and ammonium. Overall, microbial colonizers triggering soil development in alpine environments mainly originate from endogenous glacier habitats, whereas atmospheric deposition contributes to the establishment of microbial communities by providing sources of C and N.

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Section: Origin Of Microbial Pioneers In Deglaciated Soilsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Potential sources of microbial colonizers in an initial soil ecosystem after retreat of an alpine glacier

2016

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“…Although there is a history of research examining bacterial distributions in the near-surface atmosphere (Lighthart and Shaffer, 1995a, b;Lighthart, 1997;Tong and Lighthart, 1998), the majority of this work has largely been restricted to surveys of culturable bacteria (those bacteria which can readily be grown and isolated under laboratory conditions). As most bacteria cannot be readily cultured (Pace, 1997), the vast majority of airborne bacteria have effectively been excluded from these culture-based studies (Amato et al, 2005) and comprehensive surveys of airborne bacterial diversity are uncommon.…”

Section: Introductionmentioning

confidence: 99%

Spatial variability in airborne bacterial communities across land-use types and their relationship to the bacterial communities of potential source environments

et al. 2010

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Although bacteria are ubiquitous in the near-surface atmosphere and they can have important effects on human health, airborne bacteria have received relatively little attention and their spatial dynamics remain poorly understood. Owing to differences in meteorological conditions and the potential sources of airborne bacteria, we would expect the atmosphere over different land-use types to harbor distinct bacterial communities. To test this hypothesis, we sampled the near-surface atmosphere above three distinct land-use types (agricultural fields, suburban areas and forests) across northern Colorado, USA, sampling five sites per land-use type. Microbial abundances were stable across land-use types, with B10 5 -10 6 bacterial cells per m 3 of air, but the concentrations of biological ice nuclei, determined using a droplet freezing assay, were on average two and eight times higher in samples from agricultural areas than in the other two land-use types. Likewise, the composition of the airborne bacterial communities, assessed via bar-coded pyrosequencing, was significantly related to land-use type and these differences were likely driven by shifts in the sources of bacteria to the atmosphere across the land-uses, not local meteorological conditions. A metaanalysis of previously published data shows that atmospheric bacterial communities differ from those in potential source environments (leaf surfaces and soils), and we demonstrate that we may be able to use this information to determine the relative inputs of bacteria from these source environments to the atmosphere. This work furthers our understanding of bacterial diversity in the atmosphere, the terrestrial controls on this diversity and potential approaches for source tracking of airborne bacteria.

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“…In the second numerical experiment (S2 scenario), homogeneous nucleation occurred and IN concentration was assumed to be 100 000 times less than the total population of bacteria observed by Amato et al (2005) at a temperature range of −12 to −2 • C, where we adjust a polynomial equation between these two extremes. Only a fraction of total bacteria can act as IN , therefore it was set at 1 INA per m 3 of cloud volume (see Fig.…”

Section: Ice Nucleation Modelingmentioning

confidence: 99%

“…According to Amato et al (2005), the total bacterial density in clouds is about 3×10 4 cells m −3 of cloud volume (1× 10 5 cells ml −1 of cloud water) based on direct visual counts of total cells. Most of the isolated micro-organisms, including 12 fungal and 17 bacterial strains, were described for the first time in atmospheric water by Amato and colleagues.…”

Section: Introductionmentioning

confidence: 99%

Effect of bacterial ice nuclei on the frequency and intensity of lightning activity inferred by the BRAMS model

Gonçalves¹,

Martins

Albrecht

et al. 2012

Atmos. Chem. Phys.

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Abstract. Many studies from the last decades have shown that airborne microorganisms can be intrinsically linked to atmospheric processes. Certain bacteria may constitute the most active ice nuclei found in the atmosphere and might have some influence on the formation of ice crystals in clouds. This study deals with the ice nucleation activity of Pseudomonas syringae inside of thunderstorms through numerical simulations using BRAMS (Brazilian Regional Atmospheric Model System). The numerical simulations were developed in order to investigate the effect on the total amount of rainwater as a function of ice nuclei (IN) P. syringae concentrations with different scenarios (classified as S2 to S4 scenarios) corresponding to a maximum of 102 to 104 IN bacteria per liter of cloud water plus the BRAMS default (classified as S5 scenario). Additionally, two other scenarios were included without any IN (S1) and the sum of RAMS default and S4 scenario (classified as S6). The chosen radiosonde data is for 3 March 2003, typical summertime in São Paulo City which presents a strong convective cell. The objective of the simulations was to analyze the effect of the IN concentrations on the BRAMS modeled cloud properties and precipitation. The simulated electrification of the cloud permitted analysis of the total flashes estimated from precipitable and non-precipitable ice mass fluxes in two different lightning frequencies. Among all scenarios, only S4 and S6 presented a tendency to decrease the total cloud water, and all bacteria scenarios presented a tendency to decrease the total amount of rain (−8%), corroborating other reports in the literature. All bacteria scenarios also present higher precipitable ice concentrations compared to S5 scenario, the RAMS default. The main results present the total flash number per simulation as well. From the results, the total flash numbers, from both lightning frequencies, in S4 and S6 scenarios, are from 3.1 to 3.7 higher than the BRAMS default. Even the lower bacterial concentrations (scenarios S2 and S3) produced 3 time higher number of flashes, compared to S5 scenario. This result is a function of the hydrometeors in each simulation. In conclusion, IN bacteria could affect directly the thunderstorm structure and lightning formation with many other microphysical implications.

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Microbial population in cloud water at the Puy de Dôme: Implications for the chemistry of clouds

Abstract: et al.. Microbial population in cloud water at the Puy de Dôme: implications for the chemistry of clouds. Atmospheric Environment, Elsevier, 2005, pp.

Cited by 176 publications

References 29 publications

Potential sources of microbial colonizers in an initial soil ecosystem after retreat of an alpine glacier

Potential sources of microbial colonizers in an initial soil ecosystem after retreat of an alpine glacier

Spatial variability in airborne bacterial communities across land-use types and their relationship to the bacterial communities of potential source environments

Effect of bacterial ice nuclei on the frequency and intensity of lightning activity inferred by the BRAMS model

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