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We studied biomarkers (hydrocarbons, fatty acids and sterols) in foam substances from the Chikugo River system in the Hita City area, Oita Prefecture to elucidate their source organisms and materials. Normal-alkanes with a predominance of odd-carbon numbers were found together with unidentified branched alkanes and unresolved complex mixture of hydrocarbons (UCMH), and with small amount of isoprenoid alkanes. Abundance of short-chain n-alkanoic acids (C12-C19) and cholesterol were found, along with the small amounts of long-chain n-alkanoic adids (C20-C30) and branched acids (isoand anteiso-C13-C17). Biomarkers in foam substances are, therefore, mainly derived from microalgae and cyanobacteria with small amounts of vascular plants and eubacteria. The occurrence of UCMH as well as epimerized triterpanes and steranes strongly suggest the contribution of petroleum products from automobiles and road runoff including asphalts in the Chikugo River basin. Branched alkanes may be derived from insects such as Chironomidae. These organic components are important in the formation of foam substances in the Chikugo River system of the Hita City area. (受付日:2017 年 6 月 13 日,受理日:2017 年 7 月 26 日) 人間生活文化研究 Int J Hum Cult Stud. No. 27 2017 大分県日田市地域の筑後川水系における泡状物質中のバイオマーカーの地球化学的特徴 573 井上 源喜(いのうえ げんき) 現職:大妻女子大学社会情報学部教授 東京都立大学理学研究科博士後期課程修了. 専門は地球化学・陸水学・温泉科学で,人間と地球の関わりについての研究を行っている. 主な著書:Matsumoto, Genki I. (1993) Geochemical features of the McMurdo Dry Valley lakes. Physical and Biogeochemical Processes in Antarctic Lakes. Antarct. Res. Ser. 59, (eds. Green W. and Friedmann E. I.), pp. 95-118, Amer. Geophys. Union, Wash. D. C. 井上源喜・柏谷健二・箕浦幸治編著 (1998) 地球環境変動の科学―バイカル湖ドリリングプロジェク ト.269 p. 古今書院(東京). 井上源喜 (2010) 宇宙・生命・社会 137 億年のサイエンス 補訂版,150 p., 開成出版(東京).

Geochemical features of biomarkers in foam substances from the Chikugo River system in the Hita City area, Oita Prefecture