Abstract:
:Lakes are exposed to anthropogenic pollution including the release of allochthonous bacteria into their waters. Antibiotic resistance genes (ARGs) stabilize in bacterial communities of temperate lakes, and these environments act as long-term reservoirs of ARGs. Still, it is not clear if the stabilization of the ARGs is caused by a periodical introduction, or by other factors regulated by dynamics within the water column. Here we observed the dynamics of the tetracycline resistance gene (tetA) and of the class 1 integron integrase gene intI1 a proxy of anthropogenic pollution in the water column and in the sediments of subalpine Lake Maggiore, together with several chemical, physical and microbiological variables. Both genes resulted more abundant within the bacterial community of the sediment compared to the water column and the water-sediment interface. Only at the inset of thermal stratification they reached quantifiable abundances in all the water layers, too. Moreover, the bacterial communities of the water-sediment interface were more similar to deep waters than to the sediments. These results suggest that the vertical distribution of tetA and intI1 is mainly due to the deposition of bacteria from the surface water to the sediment, while their resuspension from the sediment is less important.
journal_name
FEMS Microbiol Ecoljournal_title
FEMS microbiology ecologyauthors
Di Cesare A,Eckert EM,Cottin C,Bouchez A,Callieri C,Cortesini M,Lami A,Corno Gdoi
10.1093/femsec/fiaa002subject
Has Abstractpub_date
2020-02-01 00:00:00issue
2eissn
0168-6496issn
1574-6941pii
5700709journal_volume
96pub_type
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