4.8 Article

Aerobiology over the Southern Ocean - Implications for bacterial colonization of Antarctica

期刊

ENVIRONMENT INTERNATIONAL
卷 169, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envint.2022.107492

关键词

Antarctica; Aerobiology; Dispersal; Bacteria; Biodiversity; Invasion; Climate change

资金

  1. Swiss Polar Institute [ACE-BIOAIR]
  2. Swiss National Science Foundation [200021_169090]
  3. European Commission's Marie Sklodowska-Curie Actions program [675546]
  4. Ferring Pharmaceuticals
  5. Marie Curie Actions (MSCA) [675546] Funding Source: Marie Curie Actions (MSCA)
  6. Swiss National Science Foundation (SNF) [200021_169090] Funding Source: Swiss National Science Foundation (SNF)

向作者/读者索取更多资源

Parts of the Antarctic are undergoing dramatic ecosystem changes, increasing the risk of biological invasions. The study found that bacterial diversity in the Southern Ocean air has both local and global origins, and is significantly influenced by meteorological conditions.
Parts of the Antarctic are experiencing dramatic ecosystem change due to rapid and record warming, which may weaken biogeographic boundaries and modify dispersal barriers, increasing the risk of biological invasions. In this study, we collected air samples from 100 locations around the Southern Ocean to analyze bacterial biodi-versity in the circumpolar air around the Antarctic continent, as understanding dispersal processes is paramount to assessing the risks of microbiological invasions. We also compared the Southern Ocean air bacterial biodi-versity to non-polar ecosystems to identify the potential origin of these Southern Ocean air microorganisms. The bacterial diversity in the air had both local and global origins and presented low richness overall but high heterogeneity, compatible with a scenario whereby samples are composed of a suite of different species in very low relative abundances. Only 4% of Amplicon Sequence Variants (ASVs) were identified in both polar and non -polar air masses, suggesting that the polar air mass over the Southern Ocean can act as a selective dispersal filter. Furthermore, both microbial diversity and community structure both varied significantly with meteorological data, suggesting that regional bacterial biodiversity could be sensitive to changes in weather conditions, potentially altering the existing pattern of microbial deposition in the Antarctic.

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