Characteristics of long-term changes in microbial communities from contaminated sediments along the west coast of South Korea: Ecological assessment with eDNA and physicochemical analyses

Aslan Hwanhwi Lee, Junghyun Lee, Junsung Noh, Changkeun Lee, Seongjin Hong, Bong Oh Kwon, Jae Jin Kim, Jong Seong Khim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The environmental DNA (eDNA) metabarcoding was applied to assess benthic ecological health in the west coast of South Korea by investigating a long-term microbial community change (2015–17). The ecological interaction among microorganisms, from phylum to family level, and their associations to environmental variables across the five regions were highlighted. As part of the study, the available chemistry and toxicological data in the regions during the monitoring periods were incorporated into an integrated sediment triad assessment. The bacterial communities were dominated by Proteobacteria (34.2%), Bacteroidetes (13.8%), and Firmicutes (10.8%). Proteobacteria and Bacteroidetes dominated consistently across regions and years, while Firmicutes and Cyanobacteria significantly varied by region and years (p < 0.05). The abundance of this phylum declined over time with the increasing abundance of Cyanobacteria, indicating their independent interactions to certain environmental changes. Planctomycetes and Gemmatimonadetes linked to some contaminants (ΣPAHs and Cu), implying indicator taxa. Overall, eDNA-based microbial community analysis combined with exposures of contaminants and responses of microorganisms is a promising strategy for the assessment of benthic ecological health in contaminated sediments from coastal waters.

Original languageEnglish
Article number111592
JournalMarine Pollution Bulletin
Volume160
DOIs
Publication statusPublished - 2020 Nov

Keywords

  • Environmental DNA
  • In situ microbial community
  • In vitro bioassay
  • Next-generation sequencing
  • Persistent toxic substance
  • Sediment pollution

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science
  • Pollution

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