Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Yellow-colored mats in Jeju Island lava tubes

  • Kim, Jong-Shik (Marine Industry Research Institute for East sea rim) ;
  • Kim, Dae-Shin (World Heritage Office, Jeju Special Self-Governing Provincial Government) ;
  • Lee, Keun Chul (Korean Collection for Type Cultures, Korea Research Institute of Bioscience and Biotechnology) ;
  • Kim, Yong-Hwan (Marine Industry Research Institute for East sea rim) ;
  • Ahn, Ung-San (World Heritage Office, Jeju Special Self-Governing Provincial Government) ;
  • Lee, Mi-Kyung (Korean Collection for Type Cultures, Korea Research Institute of Bioscience and Biotechnology) ;
  • Lee, Jung-Sook (Korean Collection for Type Cultures, Korea Research Institute of Bioscience and Biotechnology)
  • Received : 2019.12.09
  • Accepted : 2019.12.30
  • Published : 2019.12.30
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Abstract

The Geomunoreum Lava Tube System, declared as a UNESCO World Heritage Site, has a unique natural ecosystem. The information available about this ecosystem, which contains lava caves with secondary carbonate speleothems, is sparse. Hence, extensive research is warranted for establishing a conservation standard. We commenced microbial research on the system and have been studying the microorganisms coating the lava tube wall to acquire fundamental information for understanding the lava cave ecology of Jeju Island. Samples were collected from yellow-colored walls in six caves that are part of the system-the Bengdwi, Utsanjeon, Bukoreum, Manjang, Gimnyeong, and Yongcheon caves. This study focused on yellow walls as it is the most easily distinguished color. According to previous studies, the color of cave walls is attributed to microorganisms or their components. To determine whether the yellow mats from the Jeju lava tube walls are caused by microorganisms, we examined samples at the microscopic scale, by staining mats and analyzing bacterial isolates from glitter particles. As a result, we found that the yellow walls of lava tubes are comprised of microbial mats.

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