Reconstruction of the Eukaryotic Communities in Beppu Bay Over the Past 50 Years Based on Sedimentary DNA Barcoding

Yudai Segawa, Masanobu Yamamoto*, Michinobu Kuwae, Kazuyoshi Moriya, Hitoshi Suzuki, Koji Suzuki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Comprehensive reconstruction of changes in eukaryotic communities in the recent past is useful for determining the response of the local ecosystems to global changes during the Anthropocene. We used DNA barcoding technology to reconstruct the marine eukaryotic communities of Beppu Bay, the Seto Inland Sea, Japan, over the past 50 years based on a short sediment core. Highly vulnerable DNA fragments were preserved in the sediments, possibly due to seasonally euxinic conditions. Analysis of the 18S rRNA V9 gene region indicated the temporal variability in eukaryotic communities, which consisted mainly of dinoflagellates and diatoms, in response to changes in the nutrient regime. The dominant species in the dinoflagellate genus Alexandrium changed as the water temperature increased. In addition, enhanced contributions by terrestrial plants and mosses were detected in flood sediments. Our results suggest that DNA fragments can be used as a proxy for the paleoenvironmental and paleoecological conditions in Beppu Bay.

Original languageEnglish
Article numbere2022JG006825
JournalJournal of Geophysical Research G: Biogeosciences
Volume127
Issue number6
DOIs
Publication statusPublished - 2022 Jun

Keywords

  • Beppu Bay
  • DNA barcoding
  • eukaryotic communities
  • nutrient availability
  • sedaDNA
  • the Anthropocene

ASJC Scopus subject areas

  • Forestry
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Atmospheric Science
  • Palaeontology

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