Polar Cryoconite Associated Microbiota Is Dominated by Hemispheric Specialist Genera

Area of Science:

• Glaciology
• Microbiology
• Ecology

Background:

• Cryoconite holes are unique supraglacial environments supporting diverse microbial life.
• These environments are influenced by location and local conditions, affecting community structure.

Purpose of the Study:

• To investigate microbial communities in cryoconite holes across the Arctic and Antarctic.
• To identify regional differences in bacterial and microalgal composition.

Main Methods:

• High-throughput 16S and 18S rRNA gene sequencing was employed.
• Microbial communities from 15 distinct polar locations were analyzed.

Main Results:

• A total of 24 bacterial and 11 eukaryotic phyla were identified.
• Significant divergence observed between Arctic and Antarctic bacterial and microalgal communities.
• A core group of bacteria exists in both regions, with unique members in each polar area.
• Arctic cryoconite holes are dominated by *Chlamydomonas*, while Antarctic ones feature *Pleurastrum*.

Conclusions:

• Cryoconite holes are globally distributed but host regionally distinct microbial communities.
• Microbial life in cryoconite holes is adapted to specific environmental conditions within the cryosphere.