Escherichia coli out in the cold: dissemination of human-derived bacteria into the Antarctic microbiome

Michelle L. Power*, Angelingifta Samuel, James J. Smith, Jonathon S. Stark, Michael R. Gillings, David M. Gordon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Discharge of untreated sewage into Antarctic environments presents a risk of introducing non-native microorganisms, but until now, adverse consequences have not been conclusively identified. Here we show that sewage disposal introduces human derived Escherichia coli carrying mobile genetic elements and virulence traits with the potential to affect the diversity and evolution of native Antarctic microbial communities. We compared E. coli recovered from environmental and animal sources in Antarctica to a reference collection of E. coli from humans and non-Antarctic animals. The distribution of phylogenetic groups and frequency of 11 virulence factors amongst the Antarctic isolates were characteristic of E. coli strains more commonly associated with humans. The rapidly emerging E. coli ST131 and ST95 clones were found amongst the Antarctic isolates, and ST95 was the predominant E. coli recovered from Weddell seals. Class 1 integrons were found in 15% of the Antarctic E. coli with 4 of 5 identified gene cassette arrays containing antibiotic resistance genes matching those common in clinical contexts. Disposing untreated sewage into the Antarctic environment does disseminate non-native microorganisms, but the extent of this impact and implications for Antarctic ecosystem health are, as yet, poorly understood.

Original languageEnglish
Pages (from-to)58-65
Number of pages8
JournalEnvironmental Pollution
Volume215
DOIs
Publication statusPublished - 1 Aug 2016

Keywords

  • Class 1 integron
  • Human impacts
  • Sewage
  • ST131
  • ST95
  • Wildlife

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