Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Antibiotics promote aggregation within aquatic bacterial communities |
| Abstract | The release of antibiotics (AB) into the environment poses several threats for human health due to potential development of AB-resistant natural bacteria. Even though the use of low-dose antibiotics has been promoted in health care and farming, significant amounts of AB are observed in aquatic environments. Knowledge on the impact of AB on natural bacterial communities is missing both in terms of spread and evolution of resistance mechanisms, and of modifications of community composition and productivity. New approaches are required to study the response of microbial communities rather than individual resistance genes. In this study a chemostat-based experiment with 4 coexisting bacterial strains has been performed to mimicking the response of a freshwater bacterial community to the presence of antibiotics in low and high doses. Bacterial abundance rapidly decreased by 75% in the presence of AB, independently of their concentration, and remained constant until the end of the experiment. The bacterial community was mainly dominated by Aeromonas hydrophila and Brevundimonas intermedia while the other two strains, Micrococcus luteus and Rhodococcus sp. never exceed 10%. Interestingly, the bacterial strains, which were isolated at the end of the experiment, were not AB-resistant, while reassembled communities composed of the 4 strains, isolated from treatments under AB stress, significantly raised their performance (growth rate, abundance) in the presence of AB compared to the communities reassembled with strains isolated from the treatment without AB. By investigating the phenotypic adaptations of the communities subjected to the different treatments, we found that the presence of AB significantly increased co-aggregation by 5-6 fold. These results represent the first observation of co-aggregation as a successful strategy of AB resistance based on phenotype in aquatic bacterial communities, and can represent a fundamental step in the understanding of the effects of AB in aquatic ecosystems. |
| Source | Frontiers in microbiology 5, pp. 297 |
| Keywords | antibiotic resistanceexperimental ecologyaquatic bacteriaecological interactionsaggregation |
| Journal | Frontiers in microbiology |
| Editor | Frontiers Research Foundation,, Lausanne, Svizzera |
| Year | 2014 |
| Type | Articolo in rivista |
| DOI | 10.3389/fmicb.2014.00297 |
| Authors | Gianluca Corno; Manuela Coci; Marco Giardina; Soni Plechuk; Floriana Campanile; Stefania Stefani |
| Text | 328645 2014 10.3389/fmicb.2014.00297 ISI Web of Science WOS 000338745100001 Scopus 2 s2.0 84905378875 antibiotic resistance experimental ecology aquatic bacteria ecological interactions aggregation Antibiotics promote aggregation within aquatic bacterial communities Gianluca Corno; Manuela Coci; Marco Giardina; Soni Plechuk; Floriana Campanile; Stefania Stefani Consiglio Nazionale delle Ricerche CNR ; Laboratory of Molecular Microbiology and Antibiotic Resistance, Department of Bio Medical Sciences, University of Catania The release of antibiotics AB into the environment poses several threats for human health due to potential development of AB resistant natural bacteria. Even though the use of low dose antibiotics has been promoted in health care and farming, significant amounts of AB are observed in aquatic environments. Knowledge on the impact of AB on natural bacterial communities is missing both in terms of spread and evolution of resistance mechanisms, and of modifications of community composition and productivity. New approaches are required to study the response of microbial communities rather than individual resistance genes. In this study a chemostat based experiment with 4 coexisting bacterial strains has been performed to mimicking the response of a freshwater bacterial community to the presence of antibiotics in low and high doses. Bacterial abundance rapidly decreased by 75% in the presence of AB, independently of their concentration, and remained constant until the end of the experiment. The bacterial community was mainly dominated by Aeromonas hydrophila and Brevundimonas intermedia while the other two strains, Micrococcus luteus and Rhodococcus sp. never exceed 10%. Interestingly, the bacterial strains, which were isolated at the end of the experiment, were not AB resistant, while reassembled communities composed of the 4 strains, isolated from treatments under AB stress, significantly raised their performance growth rate, abundance in the presence of AB compared to the communities reassembled with strains isolated from the treatment without AB. By investigating the phenotypic adaptations of the communities subjected to the different treatments, we found that the presence of AB significantly increased co aggregation by 5 6 fold. These results represent the first observation of co aggregation as a successful strategy of AB resistance based on phenotype in aquatic bacterial communities, and can represent a fundamental step in the understanding of the effects of AB in aquatic ecosystems. 5 Published version Articolo 2014_Frontiers_in_microbiology_5_297.pdf Articolo in rivista Frontiers Research Foundation, 1664 302X Frontiers in microbiology Frontiers in microbiology Front. microbiol. Frontiers in microbiology gianluca.corno CORNO GIANLUCA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |