Distribution of class 1 integrons in a highly impacted catchment

Sci Total Environ. 2016 Oct 1;566-567:1588-1594. doi: 10.1016/j.scitotenv.2016.06.054. Epub 2016 Jun 14.


Polluted compounds into freshwater sediments may select and enrich bacteria carrying specific genetic compositions. Here we examine the possible use of class 1 integrons as bioindicators in freshwater environments. Samples were collected from various sediments in an urban area (Zhangye, Gansu province, China), specifically within the city, in the industrial zone, in the surrounding agricultural area and in a nearby national park. Integrons void of gene cassettes were present in all human-impacted sampling sites. A higher diversity of class 1 integrons with various gene cassettes was found in the agricultural area. Class 1 integrons and related gene cassettes were not detected in the national park. These results suggest that the prevalence and composition of class 1 integrons could be further developed as bioindicators in polluted freshwater environments.

Keywords: Bioindicator; Class 1 integron; Freshwater; Gene cassettes; Pollution; Sediments.

MeSH terms

  • Bacteria / genetics
  • Bacteria / isolation & purification*
  • China
  • Farms
  • Fresh Water / microbiology*
  • Geologic Sediments / microbiology*
  • Integrons*
  • Manufacturing and Industrial Facilities
  • Parks, Recreational
  • Water Pollution