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Bacterial isolates from the Arctic region (Pasvik River, Norway): assessment of biofilm production and antibiotic susceptibility profiles

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Abstract

Bacterial biofilm production is recognized as a strategy that helps aquatic bacteria in resisting to the presence of several kinds of pollutants, including antibiotics, in the bulk environment. The Pasvik River, located between Norway, Russia and Finland, is a sub-Arctic site polluted by wastes from metallurgic and mining activities. In order to study whether and to what extent bacteria are able to produce biofilms, and to assess whether this physiological characteristic influences their resistance to antibiotics, an investigation was performed on bacteria isolated from water and sediment collected along the Pasvik River course during two surveys (May and July). Bacterial strains were screened for their biofilm production and profiles of susceptibility to antibiotics. Results showed that biofilm formation was a widespread characteristic of the isolates. Most of them were also resistant to several antibiotics, such as ampicillin (100% of the isolates) as well as cefazolin, cefoxitin, ceftriaxone, mezlocillin, nitrofurantoin and sisomicin (90% of the total strains). This study shows a significant association between biofilm formation and antibiotic resistance at inner stations both in water and in sediments in May only. This suggests that in Pasvik River colder temperature may stimulate bacterial aggregation into biofilm and simultaneously decrease bacterial susceptibility to antibiotics; since the occurrence of antibiotic resistance has frequently been linked to the presence of pollutants, this result could represent a strategy of bacterial survival under altered environmental conditions.

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Abbreviations

AK:

Amikacin

AUG:

Amoxicillin + clavulanic acid

AMP:

Ampicillin

AZM:

Azithromycin

ATM:

Aztreonam

IMI:

Imipenem

CAR:

Carbenicillin

KZ:

Cefazolin

CTX:

Cefotaxime

FOX:

Cefoxitin

CAZ:

Ceftazidime

CRO:

Ceftriaxone

CXM:

Cefuroxime

C:

Chloramphenicol

CIN:

Cinoxacin

CIP:

Ciprofloxacin

CS:

Colistin sulphate

FOS:

Fosfomycin

CN:

Gentamycin

LEV:

Levofloxacin

MEZ:

Mezlocillin

NA:

Nalidixic acid

NET:

Netilmicin

F:

Nitrofurantoin

NOR:

Norfloxacin

OFX:

Ofloxacin

PI:

Pipemidic acid

PRL:

Piperacillin

RD:

Rifampicin

SIS:

Sisomicin

SXT:

Sulphamethoxazole + trimethoprim

TE:

Tetracycline

TGC:

Tigecycline

TOB:

Tobramycin

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Acknowledgements

This study was performed within the EU FP 7 INTERACT project SpongePOP “Sponge associated culturable microbiome able to degrade persistent organic pollutant along the Pasvik River and the Bokfjorden”. This research, however, did not receive any specific grant from this funding agency. No human subjects or experimental animals were studied in this research. The authors wish to thank Dr. Paul Eric Aspholm and Dr. Lars Ola Nilsson for valuable support in organizing and supporting their research stay at the Bioforsk Station (Svanvik, Norway). They are also grateful to Dr. Maria Papale, Antonella Conte and Marco Graziano (Department of Biological and Environmental Sciences, University of Messina, Italy) who assisted the sampling activities.

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Correspondence to Gabriella Caruso.

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Responsible editor: Robert Duran

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Laganà, P., Votano, L., Caruso, G. et al. Bacterial isolates from the Arctic region (Pasvik River, Norway): assessment of biofilm production and antibiotic susceptibility profiles. Environ Sci Pollut Res 25, 1089–1102 (2018). https://doi.org/10.1007/s11356-017-0485-1

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  • DOI: https://doi.org/10.1007/s11356-017-0485-1

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