Japan Geoscience Union Meeting 2025

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[O-11] Senior high school student poster presentations

Sun. May 25, 2025 1:45 PM - 3:15 PM Poster Hall (Exhibition Hall 7&8, Makuhari Messe)

convener:Tatsuhiko Hara(International Institute of Seismology and Earthquake Engineering, Building Research Institute), Keiko Konya(Japan Agency for Marine-Earth Science and Technology), Chieko Suzuki(Japan Agency for Marine-Earth Science and Technology), RYO NAKANISHI(National Institute of Advanced Industrial Science and Technology)


1:45 PM - 3:15 PM

[O11-P92] Heliopora coerulea in Kikai Island: Growth Rings and Development

*Kanoko Miyazaki1,2 (1.Kikai high school/SANGO RYUGAKU, 2.KIKAI institute for Coral Reef Sciences)

Keywords:Heliopora coerulea, Growth Rings, skeletal density, Coral growth

This study investigates the growth characteristics of Heliopora coerulea (blue coral) in Kikai Island, Japan. Coral samples were collected and analyzed for annual growth ring width and skeletal density. The average annual growth rate was 8.30 mm, which is faster than Poritidae. CT imaging and density measurements revealed that the base of the branching structures had higher skeletal density, likely to enhance structural stability. These results suggest that H. coerulea exhibits both rapid and stable growth. Future research will include comparative analysis with other regions and species, as well as chemical composition and DNA analyses to further understand the species’ ecological characteristics.