Seasonal variability in airborne bacterial communities at a high-elevation site

Bowers, Robert M.; McCubbin, Ian B.; Hallar, A. Gannet; Fierer, Noah

doi:10.1016/j.atmosenv.2012.01.005

Cited by 236 publications

(229 citation statements)

References 66 publications

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“…In a previous study, microarray analysis detected approximately 400 species in airborne bacterial communities on mountains (Smith et al, 2013), consistent with the estimated numbers observed in this study. In sequential surveys of a mountain site, airborne microbial communities at the higher altitudes of mountains also included highly diverse bacterial populations (Bowers et al, 2012). The main phylotypes in the three air samples were clustered into the classes Deinococci, Bacilli, Cyanobacteria, Proteobacteria, Flavobacteria and Actinobacteria (Fig.…”

Section: Bacterial Community Structures Among Three Altitudesmentioning

confidence: 99%

“…Pyrosequencing technology that can analyze large numbers of nucleotide sequences has been applied for estimating the variations in the composition of bacterial communities on mountains (Bowers et al, 2012) and in rural and urban areas (Brodie et al, 2007) at the family level. However, there are a few of researches investigating the bacterial communities at high altitudes above ground level using pyrosequencing analysis (Bowers et al, 2009;DeLeon-Rodriguez et al, 2013), and the vertical distribution of airborne bacteria between the ground and high altitudes is unclear.…”

Section: Introductionmentioning

confidence: 99%

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Vertical distribution of airborne bacterial communities in an Asian-dust downwind area, Noto Peninsula

Maki

Hara

Kobayashi

et al. 2015

Atmospheric Environment

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Bioaerosols at high altitudes were collected using an aircraft and a balloon.Pyrosequencing using 16S rDNA revealed vertical distributions of airborne bacteria.16S rDNA clone libraries suggested the transport of terrestrial and marine bacteria.Meteorological conditions contribute to vertical variations in airborne bacteria. 3 AbstractBacterial populations transported from ground environments to the atmosphere get dispersed throughout downwind areas and can influence ecosystem dynamics, human health, and climate change. However, the vertical bacterial distribution in the free troposphere was rarely investigated in detail. We collected aerosols at altitudes of 3,000 m, 1,000 m, and 10 m over the Noto Peninsula, Japan, where the westerly winds carry aerosols from continental and marine areas. During the sampling period on March 10, 2012, the air mass at 3,000 m was transported from the Chinese desert region by the westerly winds, and a boundary layer was formed below 2,000 m. Pyrosequencing targeting 16S rRNA genes (16S rDNA) revealed that the bacterial community at 3,000 m was predominantly composed of terrestrial bacteria, such as Bacillus and Actinobacterium species. In contrast, those at 1,000 m and 10 m included marine bacteria belonging to the classes Cyanobacteria and Alphaproteobacteria. The entire 16S rDNA sequences in the clone libraries were identical to those of the terrestrial and marine bacterial species, which originated from the Chinese desert region and the Sea of Japan, respectively. The origins of air masses and meteorological conditions contribute to vertical variations in the bacterial communities in downwind atmosphere.

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Section: Bacterial Community Structures Among Three Altitudesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vertical distribution of airborne bacterial communities in an Asian-dust downwind area, Noto Peninsula

Maki

Hara

Kobayashi

et al. 2015

Atmospheric Environment

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“…11248 C. Xu et al: Fungi Diversity in PM 2.5 and PM 1 at the summit of Mt. Tai ris et al, 2002;Yadav et al, 2004;Bowers et al, 2012Bowers et al, , 2013Cao et al, 2014;Ryan et al, 2009). Despite their importance, the abundance, diversity, and community structure of fungi associated with PM have received limited attention in terms of research.…”

Section: Introductionmentioning

confidence: 99%

Fungi diversity in PM<sub>2. 5</sub> and PM<sub>1</sub> at the summit of Mt. Tai: abundance, size distribution, and seasonal variation

Wei

Chen

et al. 2017

Atmos. Chem. Phys.

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Abstract. Fungi are ubiquitous throughout the near-surface atmosphere, where they represent an important component of primary biological aerosol particles. This study combined internal transcribed spacer region sequencing and quantitative real-time polymerase chain reaction (qPCR) to investigate the ambient fungi in fine (PM 2.5 , 50 % cutoff aerodynamic diameter D a50 = 2.5 µm, geometric standard deviation of collection efficiency σ g = 1.2) and submicron (PM 1 , D a50 = 1 µm, σ g = 1.2) particles at the summit of Mt. Tai located in the North China Plain, China. Fungal abundance values were 9.4 × 10 4 and 1.3 × 10 5 copies m −3 in PM 2.5 and PM 1 , respectively. Most of the fungal sequences were from Ascomycota and Basidiomycota, which are known to actively discharge spores into the atmosphere. The fungal community showed a significant seasonal shift across different size fractions according to Metastats analysis and the Kruskal-Wallis rank sum test. The abundance of Glomerella and Zasmidium increased in larger particles in autumn, whereas Penicillium, Bullera, and Phaeosphaeria increased in smaller particles in winter. Environmental factors, namely Ca 2+ , humidity, and temperature, were found to be crucial for the seasonal variation in the fungal community. This study might serve as an important reference for fungal contribution to primary biological aerosol particles.

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“…We found, however, that atmospheric bacterial and fungal communities deposited in the Damma glacier catchment were different from those of soils. Atmospheric bacteria and fungi can originate from various sources, such as soils, water and plants (Bowers et al, 2009(Bowers et al, , 2012, and can be transported through the atmosphere attached to dust particles (Favet et al, 2013) or freely as single cells participating in ice nucleation processes (Bowers et al, 2009;Šantl-Temkiv et al, 2012). Recently, Hervàs et al (2009) and Figure 5 Distance-based redundancy ordinations (db-RDA) built based on selected environmental variables that constrained most of the variability of the bacterial (a) and fungal (b) community structures.…”

Section: Origin Of Microbial Pioneers In Deglaciated Soilsmentioning

confidence: 99%

“…Mineral debris released after glacier retreat is exposed to continuous atmospheric input (exogenous source) of microbes (Womack et al, 2010) through precipitations (Zhang et al, 2010;Šantl-Temkiv et al, 2012) and dry deposition, such as wind-blown dust and plant debris (Chuvochina et al, 2011;Bowers et al, 2012;DeLeon-Rodriguez et al, 2013). The atmosphere in particular is often wrongly considered sterile because of harsh ultraviolet (UV) radiation and extreme C and nutrient limitations (Womack et al, 2010).…”

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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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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Seasonal variability in airborne bacterial communities at a high-elevation site

Cited by 236 publications

References 66 publications

Vertical distribution of airborne bacterial communities in an Asian-dust downwind area, Noto Peninsula

Vertical distribution of airborne bacterial communities in an Asian-dust downwind area, Noto Peninsula

Fungi diversity in PM<sub>2. 5</sub> and PM<sub>1</sub> at the summit of Mt. Tai: abundance, size distribution, and seasonal variation

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

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Seasonal variability in airborne bacterial communities at a high-elevation site

Cited by 236 publications

References 66 publications

Vertical distribution of airborne bacterial communities in an Asian-dust downwind area, Noto Peninsula

Vertical distribution of airborne bacterial communities in an Asian-dust downwind area, Noto Peninsula

Fungi diversity in PM&lt;sub&gt;2. 5&lt;/sub&gt; and PM&lt;sub&gt;1&lt;/sub&gt; at the summit of Mt. Tai: abundance, size distribution, and seasonal variation

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

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Fungi diversity in PM<sub>2. 5</sub> and PM<sub>1</sub> at the summit of Mt. Tai: abundance, size distribution, and seasonal variation