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• Male’s influence on the primary sex ratio bias in Ryukyu drywood termite

  Agarie A.

  Frontiers in Ecology and Evolution ( Frontiers in Ecology and Evolution )  10   2023.01 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Selfish genetic elements (SGEs) increase their transmission efficiency relative to the rest of the individual genome, which is often deleterious to individual fitness. Theoretical studies have suggested that intragenomic conflict over the sex ratio distortion between SGEs and the rest of the genome should lead to the evolution of sex-determining systems. However, in insects, there are relatively few studies other than those on Dipterans, which makes it difficult to understand the role of SGEs in the evolution of insect sex determination. This is partially due to the difficulties in observing SGEs under field conditions. The effect of SGEs is often masked by the counter-evolution of the resistance genes. Interpopulation cross-breeding experiments are effective to detect the SGEs and their resistance genes. If these populations have different SGEs and resistance genes, cross-breeding experiments reveal their existence by collapsing the evolutionary antagonistic state. The Ryukyu drywood termites Neotermes sugioi, distributed in the Ryukyu Islands, show male-biased sex ratios in pseudergates, nymphs, alates and soldiers both in Okinawa and Ishigaki Islands, but different degrees of bias have been reported between the islands. Male-specific microsatellite alleles have been reported in this species, which allowed us to identify the sex of the eggs and young larvae. In this study, we used the microsatellite locus with male-specific alleles to investigate the primary sex ratio of field colonies on Okinawa and Ishigaki islands and the sex ratio of offspring obtained through cross-breeding experiments between the islands. The primary sex ratios of field colonies were male-biased in Okinawa but not in Ishigaki. Cross-breeding experiments showed that Okinawa males tend to have a male-biased sex ratio in their offspring, but Ishigaki males do not. This result is consistent with the hypothesis that the male bias in this species is caused by SGEs, even though termites are phylogenetically distant from Diptera. Accumulation of knowledge on genetic conflicts in a wide range of taxa might be an important step toward elucidating the mechanisms of diversification of sex determination systems in insects.

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• Differences among Junior High Schools in Okinawa about Gender Differences in Perception and Interest for Science and Mathematics

  MIYAGUNI Yasushi, FUKUMOTO Kozo, SUGIO Koji

  Journal of Science Education in Japan ( Japan Society for Science Education )  46 ( 1 ) 81 - 90   2022.04 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Caste development and sex ratio of the Ryukyu drywood termite Neotermes sugioi and its potential mechanisms.

  Miyaguni Y, Agarie A, Sugio K, Tsuji K, Kobayashi K

  Scientific reports ( Scientific Reports )  11 ( 1 ) 16227   2021.08 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Male‐specific alleles in the Ryukyu drywood termite Neotermes sugioi

  Ayaka Agarie, Yasushi Miyaguni, Koji Sugio, Kazuya Kobayashi

  Ecology and Evolution ( Ecology and Evolution )  2020 ( 10 ) 9584 - 9587   2020.09 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Colony structure and caste distribution in living trees of the Ryukyu drywood termite, Neotermes sugioi (Blattodea: Kalotermitidae) in Okinawa Island

  Koji Sugio, Yasushi Miyaguni, Tsuyoshi Yoshimura

  Journal of Asia-Pacific Entomology ( Journal of Asia-Pacific Entomology )  23 ( 4 ) 853 - 862   2020.07 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Students Evaluation and Growth in "Science Education Academy of the Ryukyus"

  SHIROMA Yoshitaka, HOJO Masaru, FUKUMOTO Kozo, RENZETTI Andrea, MIYAGUNI Yasushi, FURUKAWA Masahide, SUGIO Koji

  Proceedings of the Annual Meeting of Japan Society for Science Education ( Japan Society for Science Education )  44 ( 0 ) 335 - 336   2020

   

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• A-6 環境の変化する砂浜海岸を理科教材として活用していくための基礎的研究 : イソハマグリとリュウキュウナミノコガイの分布状況を通して

  友利 義明, 杉尾 幸司

  日本理科教育学会九州支部大会発表論文集 ( 日本理科教育学会九州支部 )  42   22 - 25   2015

   

• A-8 沖縄島南部の都市公園における[土壌動物を用いた自然の豊かさ評価]の教材化に向けた基礎研究

  比嘉 聡, 杉尾 幸司

  日本理科教育学会九州支部大会発表論文集 ( 日本理科教育学会九州支部 )  42   28 - 31   2015

   

Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Grant-in-Aid for Scientific Research(B)

  Project Year: 2023.07  -  2029.03 

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2023.07  -  2028.03 

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2021  -  2024.03 

  Direct: 3,200,000 (YEN)  Overheads: 960,000 (YEN)  Total: 4,160,000 (YEN)

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2020  -  2023.03 

  Direct: 3,200,000 (YEN)  Overheads: 960,000 (YEN)  Total: 4,160,000 (YEN)

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2020  -  2023.03 

  Direct: 3,300,000 (YEN)  Overheads: 990,000 (YEN)  Total: 4,290,000 (YEN)

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• 2020.07

  　

  　

• 2020.06

  　

  　

• 2019.12

  　

  　

• 2015.08

  　

  　

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