Seasonal Variation in Fungi in Beach Sand in Summertime: Stintino (Italy)

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Abstract

Background: The goal of this study was to monitor the microbial biodiversity in beach sand that is heavily visited by tourists during the summer, and to determinate whether the high presence of bathers (around 5000 per day) can modify sand microbial composition. Methods: Between 2016 and 2020, 150 sand samples were collected from nine different points at La Pelosa beach in Sardinia, Italy. Non-culturing methods were used; DNA extraction and meta-barcode sequencing were performed. All samples were analyzed with sequencing methods for 16S and ITS sequences. Results: Fungal genera differ on the three beaches and in the winter/summer zones. The ITS sequence showed the most common presence of Candida during summer and Paradendryphiella in the winter. The greatest diversity was found in the dune during winter, while in other parts of the beach, there are differences between bacteria and fungi, particularly in the wash zone during the winter, with high diversity for 16S sequences but low diversity for ITS sequences. Conclusions: It appears reasonable that the sands, even on non-urban beaches, should be included in health monitoring programs in addition to the waters, and that access to them should be regulated by limiting the number of bathers with the aim of reducing the presence of pathogenic fungal species.

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Deligios, M., Mazzarello, V., Fiamma, M., Barac, A., Diana, L., Ferrari, M., … Rubino, S. (2023). Seasonal Variation in Fungi in Beach Sand in Summertime: Stintino (Italy). International Journal of Environmental Research and Public Health, 20(23). https://doi.org/10.3390/ijerph20237134

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