The vertical distribution of tetA and intI1 in a deep lake is rather due to sedimentation than to resuspension.

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 Ecol

authors

Di Cesare A,Eckert EM,Cottin C,Bouchez A,Callieri C,Cortesini M,Lami A,Corno G

doi

10.1093/femsec/fiaa002

subject

Has Abstract

pub_date

2020-02-01 00:00:00

issue

2

eissn

0168-6496

issn

1574-6941

pii

5700709

journal_volume

96

pub_type

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