理学部（生物班）が、2026年度 中国四国地区 生物系三学会合同大会 鳥取大会 高校生ポスター発表の部（生態分野）で「四国に唯一現存するカジカ大卵型の由来と生息環境」を発表し、優秀賞を受賞しました。
2026年5月19日 09時30分HEP-18
Origin and habitat environment of the only extant large-egg type Cottus pollux in Shikoku
Osuke Kawada, Hiyori Okuno, Ai Kitamachi, Masaaki Kawada
Kagawa Prefectural Takamatsu Sakurai High School
No report has previously clarified the origin of the surviving regional populations of Cottus pollux (Günther, 1873) in Shikoku. This study clarified the genetic relationships of the surviving C. pollux LE population (Kagawa population) in Shikoku and revealed that it possesses a unique haplotype. This Kagawa population, the only surviving C. pollux LE in Shikoku, showed the smallest genetic distance to the C. pollux ME population of the Takahashi River system in Okayama Prefecture. A haplotype network constructed using the genetic sequences of the Cottus species complex reported by Yamamoto (2018) and Kanno et al. (2018), retrieved from the International Nucleotide Sequence Database Collaboration (INSDC), placed the Kagawa population within the C. pollux ME clade. These findings suggest that the identification of the Kagawa population as C. pollux LE warrants further review.
Literature Cited
Yamamoto S (2019) Genetic population structure of Japanese river sculpin Cottus pollux (Cottidae) large-egg type, inferred from mitochondrial DNA sequences. Journal of Fish Biology, 94:332–339
Kanno K, Inui R, Koyama A, Onikura N (2019) Morphological, distributional, and genetic characteristics of Cottus pollux middle-egg type in Kyushu Island, Japan. Ichthyol. Res., 66: 149–159