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  4. Gastropods as a source for fecal indicator bacteria in drinking water
 
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Gastropods as a source for fecal indicator bacteria in drinking water

Citation Link: https://doi.org/10.15480/882.8374
Publikationstyp
Journal Article
Date Issued
2023-10-01
Sprache
English
Author(s)
Leister, Carolin  
Reiner, Johannes Eberhard  
Grießmeier, Victoria Sofie  
Gescher, Johannes  
Technische Mikrobiologie V-7  
Hügler, Michael  
TORE-DOI
10.15480/882.8374
TORE-URI
https://hdl.handle.net/11420/42984
Journal
Water research  
Volume
244
Article Number
120494
Citation
Water Research 244: 120494 (2023-10-01)
Publisher DOI
10.1016/j.watres.2023.120494
Scopus ID
2-s2.0-85168481990
Microbial water quality is routinely examined using the fecal indicator bacteria Escherichia coli, coliform bacteria and enterococci. Several practical cases in German drinking water distribution systems indicated invertebrates such as insects or gastropods as a source for the microbiological deterioration. Therefore, we examined three genera of Gastropoda (Arion, Helix and Cepaea) for the presence of fecal indictor bacteria in excreta using standard methods. Enterococci and coliform bacteria were detected in high concentrations (mean values of 1.5 × 106 and 6.3 × 106 per gram feces, respectively). E. coli was also detected, still specification revealed that what was assigned by standard ISO-methods to be E. coli was indeed a novel species of Buttiauxella, exhibiting β-D-glucuronidase activity, thus, explaining the false-positive results. Microbiome analyses confirmed the cultural results. Enterobacteriaceae were dominant in the samples, yet only very few sequences could be assigned to Escherichia. Our study suggests, that enterococci and coliform bacteria are an integral component in the gastropod microbiome, whereas E. coli might be derived from other sources with gastropods being a vector. The results further indicate, that the current concept of fecal indicator bacteria needs to be extended, as not only humans and homeothermic animals could be a source for fecal indictor bacteria, but also gastropods need to be taken into consideration.
Subjects
Coliform bacteria
Drinking water
E. coli
Enterobacteriaceae
Enterococci
Fecal indicator bacteria
Gastropoda
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