Microbial dispersal from a hyperactive sandsheet in the Icelandic Highland

Area of Science:

• Microbiology
• Atmospheric Science
• Geosciences

Background:

• Atmospheric transport is a key microbial dispersal mechanism, linking ecosystems globally.
• The coupling of atmospheric and soil ecosystems influences global biogeochemical cycles.
• Dust sources, like Iceland's Dyngjusandur sandsheet, contribute significantly to the global dust cycle.

Purpose of the Study:

• To investigate the microbial communities in the atmosphere above the Dyngjusandur sandsheet.
• To link airborne microbes to their terrestrial sources and understand meteorological influences.
• To assess the potential impacts of these airborne microbes.

Main Methods:

• Utilized the Dyngjusandur sandsheet as a case study.
• Analyzed bioaerosol communities and their relationship to meteorological conditions (wind speed, atmospheric pressure).
• Performed source tracking, particle analysis, culturing, and forward trajectory modeling.

Main Results:

• A unique airborne microbial community was identified, dynamically responding to weather patterns.
• Storm events significantly increased the atmospheric presence of sand-associated microorganisms (up to 76%).
• Microbes attached to complex dust particles showed enhanced atmospheric survivability, with viable, stress-tolerant taxa detected.

Conclusions:

• Atmospheric conditions, particularly storms, drive microbial community dynamics and source contributions.
• Bioaerosols from the Dyngjusandur sandsheet are potentially transported to Europe, impacting health, agriculture, and ecosystems.
• The study highlights the significant role of atmospheric microbial dispersal in global biogeochemical processes.