Yamaguchi Akiyoshido Stalactite discoloration due to light-up November 12, 16:40
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Participated with countries and experts about the progress of algae and other breeding under the influence of light-up light for tourists on part of the stalactite of Akiyoshido, a special natural monument in Yamaguchi Prefecture A countermeasure meeting was held.
Akiyoshido, one of the largest limestone caves in Biei, Yamaguchi Prefecture, is lit up for tourists, and the effect of this light causes algae and plant breeding, causing a phenomenon that part of the stalactites turn green. It is.
The city has set up a committee of experts since June, and has begun to consider measures, and on the 11th, the person in charge of the Agency for Cultural Affairs also attended and the second measures meeting was held.
The meeting was only opened at the beginning, and according to the attendees, it was reported that the reproduction of bacteria and green algae that perform photosynthesis was confirmed, and the influence of the wavelength of the light of the LED light used for lighting on the reproduction. It is said that we have been inquiring about investigating.
The breeding of algae and plants under the influence of such lighting has become an issue in caves in various places, and Biei City wants to come up with effective countermeasures ahead of the whole country.
Kazuhisa Yoshimura, Professor Emeritus, chairman of the committee, said, “I want to contribute to the environmental conservation not only in Japan but also in caves all over the world by investigating as much as possible the reasons for breeding, such as the amount of light and nutrients, and developing effective measures.” It is.