Preprints
https://doi.org/10.5194/bg-2020-324
https://doi.org/10.5194/bg-2020-324

  22 Dec 2020

22 Dec 2020

Review status: a revised version of this preprint is currently under review for the journal BG.

Determining the hierarchical order by which the variables of sampling season, dust outbreaks occurrence, and sampling location, can shape the airborne bacterial communities in the Mediterranean basin

Riccardo Rosselli1, Maura Fiamma2, Massimo Deligios2, Gabriella Pintus3, Grazia Pellizzaro3, Annalisa Canu3, Pierpaolo Duce3, Andrea Squartini4, Rosella Muresu5, and Pietro Cappuccinelli2 Riccardo Rosselli et al.
  • 1Department of Biology, University of Padova, Via Ugo Bassi 58/b, 35131 Padova, Italy
  • 2Department of Biomedical Sciences-University of Sassari, Italy
  • 3Institute of Biometeorology-National Research Council (IBIMET-CNR), Italy
  • 4Department of Agronomy Animals, Food, Natural Resources and Environment, DAFNAE, University of Padova, Viale dell'Universit√† 16, 35020 Legnaro (Padova) Italy
  • 5Institute of Animal Production Systems in Mediterranean Environments-National Research Council (ISPAAM-CNR), Italy

Abstract. An NGS-based taxonomic analysis was carried out on airborne bacteria sampled at ground level in two periods (May and September) and two opposite localities on the North-South axis of the Sardinia Island. Located in a central position of the Mediterranean basin, Sardinia constitutes a suitable outpost to reveal possible immigration of bacterial taxa during transcontinental particle discharge between Africa and Europe. With the aim of verifying relative effects of dust outbreaks, sampling period and sampling site, on the airborne bacterial community composition, we compared air collected during dust-carrying meteorological events to that coming from wind regimes not associated to long-distance particle lifting. Results indicated that: (a) a higher microbial diversity (118 orders vs 65) and increased community evenness were observed in the campaign carried out in September in comparison to the one in May, irrespective of the place of collection and of the presence or absence of dust outbreaks. (b) During the period of standard wind regimes without transcontinental outbreaks a synchronous, concerted succession of bacterial communities across distant locations of the same island, accompanied as mentioned by a parallel rise in bacterial diversity and community evenness appears to have occurred. (c) changes in wind provenance could transiently change community composition in the locality placed on the coast facing the incoming wind, but not in the one located at the opposite side of the island; for this reason the community changes brought from dust outbreaks of African origin are observed only in the sampling station exposed to south; (d) the same winds, once proceeding over land appear to uplift bacteria belonging to a common core already present over the region, which dilute or replace those that were associated with the air coming from the sea or conveyed by the dust particulate, explaining the two prior points. (e) the hierarchy of the variables tested in determining bacterial assemblages composition results: sampling period >> ongoing meteorological events > sampling location within the island.

Riccardo Rosselli et al.

 
Status: final response (author comments only)
Status: final response (author comments only)
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Riccardo Rosselli et al.

Riccardo Rosselli et al.

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Short summary
The bacteria carried by winds over the Sardinia island in the Mediterranean sea were collected and their identities investigated by reading DNA sequences. The sampling period resulted the factor that mostly determined the airborne species composition as its role was stronger than that of dust-carrying storms and of geographical position of the sampling station. The bacteria found when the sampling was performed in September had more species variety than those collected in May.
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