Stable Isotope Analysis of the Contribution of Algae Grazing Fish, Ayu Plecoglossus altivelis, to the Food Supply of MacroinvertebratesShinji Takahashi; Hirokuni Goya; Shin-ichiro Abe; Yasuhiro Takemon; Kei'ichiro Iguchi, ABSTRACT
Attached benthic algae are important primary producers in river ecosystems that are foraged by benthic macroinvertebrates and grazing fishes. The Ayu (Plecoglossus altivelis) is an algae‐feeding fish that feeds on attached benthic algae. Fine particulate organic matter (FPOM) is generated when P. altivelis uses its comb‐like teeth to graze algae off the surface of stones and dislodge them into streams. We investigated how P. altivelis feeding on algae contributes to the production of algae‐derived FPOM. We subsequently evaluated the produced FPOM to determine whether it affected the origin of the macroinvertebrate food supply. To investigate P. altivelis density, the biomass of primary producers, and the food use fraction of consumers, field surveys were conducted in the Kamo‐gawa River, Japan, in the summer from 2018 to 2020. Carbon and nitrogen stable isotope ratios of macroinvertebrates and food sources were measured to estimate the composition of FPOM and the contribution of different food sources to primary consumers. Our results showed that algal biomass decreased at sites with a high density of P. altivelis, where the proportion of algae‐derived FPOM increased. The algal contribution to macroinvertebrates increased at sites with high algae‐derived FPOM. Furthermore, structural equation modeling revealed that the feeding behavior of P. altivelis contributed to macroinvertebrate food utilization via the production of algae‐derived FPOM. These results suggest that P. altivelis is a keystone species that not only produces algae‐derived FPOM but also improves the food supply to macroinvertebrates and promotes river ecosystem dynamics., Wiley
River Research and Applications, 28 May 2025,
[Invited] Measurement and Observation and Difficulties in the Teaching of Meteorological-related Items in Compulsory Education Schools:
Takashi ITO; Shin-ichiro ABE; Harumoto GUNJI; Kouichi GOTOU and Naoki MIYAMOTO, 日本地学教育協会
地学教育, 10 May 2023, [Reviewed]
Aquatic pest control methods for Cymbella janischii with hot water, ethanol and saltwater
川之辺素一・阿部信一郎, 長野県水産試験場
長野県水産試験場研究報告, 01 Mar. 2023
Anxiety which senior undergraduates feel about becoming a schoolteacher and their coping with the anxiety
Hikaru Tameda and Shin-ichiro Abe, Corresponding, 茨城大学
茨城大学教育学部紀要 (教育科学), 20 Feb. 2023
Spatiotemporal dynamics in the number of beetles attracted to streetlights in Shirosato Town, Ibaraki Prefecture
Takuya Terakado and Shin-ichiro Abe, Corresponding, 茨城大学
茨城大学教育学部紀要 (自然科学), 20 Feb. 2023
Changes in time perception with sleep-wake rhythm
Fuki Sato and Shin-ichiro Abe, Corresponding, 茨城大学
茨城大学教育学部紀要 (自然科学), 20 Feb. 2023
Functional response of a grazing fish Plecoglossus altivelis to ,lotic benthic algal assemblages.
Shin-ichiro Abe and Kei’ichiro Iguchi, Lead, Japanese Society of Phycology
Japanese Journal of Phycology (Sôrui), 10 Nov. 2022, [Reviewed]
同形世代交代型褐藻アミジグサの季節的消長と環境要因との関連
新井嵩博・阿部信一郎・鈴木秀和・神谷充伸, 日本藻類学会
藻類, 10 Jul. 2022, [Reviewed]
Ecological, physiological, and biomechanical differences between gametophytes and sporophytes of Chondrus ocellatus (Gigartinales, Rhodophyta)
Mitsunobu Kamiya; Naoto Inoue; Chika Suzuki; Shin-ichiro Abe, the Phycological Society of America
Journal of Phycology, 18 Oct. 2021, [Reviewed]
Differentiation of wild and stocked ayu lecoglossus altivelis caught in the Takahashi River, Okayama Prefecture, in 2017
Yoshiyuki SUENAGA and Shin-ichiro ABE, Corresponding, 茨城大学教育学部
茨城大学教育学部紀要（自然科学）, Jan. 2021
Young children’s activities at the grassy playground of the kindergarten attached to Ibaraki University
Asuka TOKUHARA; Naomi KAMINAGA and Shin-ichiro ABE, Corresponding, 茨城大学教育学部
茨城大学教育学部紀要（教育科学）, Jan. 2021
Relationships of recreating natural environments and character of science teachers to interest undergraduates in science and technology
Yurika Ohmori; Kouichi Gotou; Yoshihiro Shoji; Shin-ichiro Abe, Corresponding, 茨城大学
茨城大学教育学部紀要（教育科学）, 01 Jan. 2020
Estimating hatch dates of juveniles of ayu Plecoglossus altivelis ascending Takahashi River, Okayama Prefecture, in 2017
Haruki Yamada; Iki Murase; Shin-ichiro Abe, Corresponding, 茨城大学
茨城大学教育学部紀要（自然科学）, 01 Jan. 2020
Relationship between the water potential and equilibrium moisture content of steamed and dried sweet potatoes
Umi Saito; Eiki Iwashita; Shin-ichiro Abe, Corresponding, 茨城大学
茨城大学教育学部（自然科学）, 01 Jan. 2020
Distribution of Antibiotic-resistant bacteria in the stream flowing through Mito City, Ibaraki Prefecture
Kazusa Iwai; Shin-ichiro Abe, Corresponding, 茨城大学
茨城大学教育学部（自然科学）, 01 Jan. 2020
Habitat factors of Niwaella delicata in the Nishino River dranage of Kiso River, Nagano Prefecture
Sho Kobayashi; Mayu Nakano; Shin-ichiro Abe and Keisuke Takata
J. FAC. SCI. SHINSHU UNIVERSITY, 01 Jan. 2019
Distribution of egg sacs in oviposition sites of the salamander Hynobius tokyoensis in the Mito City Forest Park, Ibaraki Prefecture
Katsuki Takagi and Shin-ichiro Abe, Corresponding
茨城大学教育学部紀要(自然科学), 01 Jan. 2019
Differentiation of wild and stocked ayu Plecoglossus altivelis in the Takahashi River, Okayama Prefecture, by counting the scale number above the lateral line
Tomoyuki Kobori and Shin-ichiro Abe, Corresponding
茨城大学教育学部紀要(自然科学), 01 Jan. 2019
Relationship between donation amounts to environmental organizations engaged in biodiversity conservation and business activity in Japan
Daichi Aoyama and Shin-ichiro Abe, Corresponding, 茨城大学教育学部
茨城大学教育学部紀要（自然科学）, 01 Jan. 2019
Effects of environmental modification due to weirs on freshwater fish communities
Yuusuke Youta; Yuichi Kano; Shin-ichiro Abe; Kei'ichiro Iguchi and Takaharu Natsumeda, Ecology and Civil Engineering Society
Ecology and Civil Engineering, 01 Sep. 2018, [Reviewed]
Longitudinal variance in periphyton productivity along the Yakugachigawa stream flowing through Amami Oshima Island
Shin-ichiro Abe; Takaharu Natsumeda; Satoru Kuroda; Tetsuya Horie; Kei’ichiro Iguchi, Lead, The Japanese Society of Phycology
Sourui, 10 Jul. 2018, [Reviewed]
Consumer consciousness about local dish"Tsuto-tofu" in Ibaraki Town.
Emiko Ishijima; Kiyotake Ashima; Shinichi Taguchi; Tasuku sakurai; makoto Tamura and Shin-ichiro Abe, The Japanese society of Cookery Science
Journal of Cookery Science of Japan, 23 Feb. 2018, [Reviewed]
Reflecting on the Fieldwork conducted in the Minamata City using image mapping test
Shin-ichiro Abe; Harumoto Gunji, Lead, 茨城大学大学教育センター
茨城大学大学教育センター紀要, 06 May 2016
The current lore situation of the regional cuisine Tutodoufu in Ibaraki-machiIshijima Emiko; Abe Shinishirou; Tamura Makoto; Ajima Kiyotake,
茨城町郷土料理「つと豆腐」の伝承状況とその関連要因 ○石島恵美子
１），阿部信一郎
２），田村誠
２），安島清武
２） （
１）東京学芸大学大学院連合大学校，
2) 茨城大学）
【目的】多くの郷土料理は，伝承機会が減少し消失の危機にある。本研究では，茨城県中央部に位置する茨城町の郷土料理である「つと豆腐」の喫食現状を把握するとともに，伝承意識に影響を及ぼす関連要因を検討することとした。 【方法】調査対象者は，茨城町５地区から住民200名ずつ合計1000名を無作為抽出し，2015年10月に質問紙を郵送で行った。回収率は33.8％で，有効回答数は313票であった。質問紙の項目は，属性として性別や年齢居住形態など６項目，共生意識に関すること10項目，郷土料理の伝承意識に関すること４項目，つと豆腐に関すること15項目，合計35項目とした。 【結果】つと豆腐を知っている人は，回答者の37.1％で，50歳以上が47.8％であったのに対し，50歳未満では22.6％であり，年代による差が見られた。50歳未満でつと豆腐を知っている人は，日常的に調理し，近所付き合いに積極的で，家庭での年中行事をよく行うという傾向が見られた。つと豆腐を知っていると回答した人のうち，現在もつと豆腐を食べている人は19.7％，食べたことが無い人は9.7％であった。また，現在もつと豆腐を作っている人は9.2％，作ったことが無い人は67.3％であった。つと豆腐を調理しない理由で最も多かったのは，「作る機会がない」で61.1％，喫食機会は「通夜」が最も多く（37.4％），喫食場所は「親戚の家（18.1％）が最も多かった。重回帰分析の結果，つと豆腐の伝承意識は，積極的に地域のイベントに参加し，つと豆腐を美味しいと感じる人で高くなる傾向が認められた。重回帰係数の比較から，つと豆腐を美味しく感じることが伝承意識に一番影響を与えていることがわかった。
, The Japan Society of Cookery Science
Abstracts of the Annual Meeting of the Japan Society of Cookery Science, 2016
Differung wariness for approaching humans among cormorant migrans advancing into rural or urban habitats.
Iguchi K.; Shinagawa T.; Tsuruta T.; Natsumeda T.; Konishi K. & Abe S.
Journal of Agricultural Science, 01 Oct. 2015, [Reviewed]
Distribution of Donax semigranosus and other bivalves in sandy shore swash zones along the Japan Sea coast of Honshu.
Y. Takada; N. Kajihara; S. Abe; T. Iseki; Y. Yagi; H. Sawada; H. Saito; S. Mochizuki and T. Murakami
VENUS, 01 Jan. 2015, [Reviewed]
Exposure of a herbivorous fish to 134Cs and 137Cs from the riverbed following the Fukushima disaster
J. Tsuboi; S. Abe; K. Fujimoto; H. Kaeriyama; D. Ambe; K. Matsuda; M. Enomoto; A. Tomiya; T. Morita; T. Ono; S. Yamamoto and K. Iguchi
Journal of Environmental Radioactivity, 01 Jan. 2015, [Reviewed]
Educational significance of fishermen's activities providing opportunities for schoolchildren to play in streamsABE Shin-ichiro; SAJIKI Takahiro; TAMAKI Yasuji; AWATA Satoshi; IGUCHI Keiichiro, In Japanese streams fishermen often give children the opportunity to enjoy natural environments by allowing them to participate in such activities as releasing fish stock and creating spawning sites, as well as by conducting habitat preservation activities, fishing schools and nature observation tours. This study assessed the educational significance of fishermens activities involving schoolchildren using a questionnaire survey of men and women at least 20 years old who were attending an exhibition at the Nikko Laboratory of the National Research Institute of Fisheries Science in August 2010. More than 70% of the respondents acknowledged the educational significance in the people–nature relationship and mental/psychological aspects of such activities; women evaluated the significance of such activities more positively compared with men. In the social life aspect, less than 50% of the respondents acknowledged being motivated to engage in freshwater fisheries activities and to settle in the local community. Meanwhile over 70% thought the activities would improve the appreciation of freshwater fisheries and the local community and inform the value of labor and cooperation. The results suggest most people appreciate the contribution of these fishermens activities in the education of children., The Japanese Society of Limnology
Japanese Journal of Limnology (Rikusuigaku Zasshi), 20 Sep. 2013,
[Reviewed] Valuating the preservation of aesthetic stream viewing by ayu (Plecoglossus altivelis altivelis) stock enhancementSAJIKI Takahiro; TAMAKI Yasuji; TAKAHASHI Yoshifumi; ABE Shin-ichiro; IGUCHI Kei'ichiro, The stock enhancement of ayu,
Plecoglossus altivelis altivelis, by inland water fisheries cooperatives improves the productivity of inland water fisheries and recreational fishing and has an incidental function of preserving aesthetic stream viewing by preventing benthic algal proliferation. This study estimated the economic value of preserving aesthetic stream viewing by ayu stock enhancement and determined the factors that affect the economic value of preserving aesthetic stream viewing. We applied the double-bounded dichotomous choice contingent valuation method (CVM) using a questionnaire completed by 838 respondents from all over Japan, excluding Hokkaido and Okinawa. We found that the mean willingness to pay (WTP) for preserving aesthetic stream viewing by ayu stock enhancement corresponded to 4,216 yen per household. The important factors influencing the respondents' WTP were: respondents' experience of walking or jogging alongside the stream; swimming or playing in the stream; climbing a gorge; respondents living within 1 km of the stream; respondents who earn a higher annual household income; respondents who could pay the lower bid amount listed in the questionnaire., The Japanese Society of Limnology
Japanese Journal of Limnology (Rikusuigaku Zasshi), Aug. 2012,
[Reviewed] 河川環境とアユの放流
阿部信一郎; 玉置泰司; 井口恵一朗
農林水産技術研究ジャーナル, Jul. 2011, [Invited]
奄美大島に生息する絶滅危惧種リュウキュウアユ（Plecoglossus altivelis ryukyuensis）に対して人々が持つ価値観に影響を及ぼす要因
阿部信一郎; 井口恵一朗; 玉置泰司
陸水学雑誌, Sep. 2010, [Reviewed]
奄美大島産リュウキュウアユの産卵環境
鶴田哲也; 阿部信一郎; 米沢俊彦; 井口恵一朗, 絶滅が危惧されているリュウキュウアユを対象に、保全プログラムの構築を目指して、産卵条件に関する現地調査を行った。産卵床の集まるエリア内の環境変数にロジスティック回帰分析を適用すると、産着卵の有無を説明する要因として底質硬度が抽出された。また、産卵床付近に多量に出現したオキナワヒゲナガカワトビケラは、同所的なアユの産卵を阻害する可能性が示唆された。
応用生態工学, Dec. 2009, [Reviewed]
鹿児島県屋久島の河川におけるアユの分布と付着藻類食性
阿部信一郎; 井口恵一朗; 南雲保; 片野修
藻類, Mar. 2005, [Reviewed]
Territorial defendability of an excess food supply in an algal grazing fish, ayu
Iguchi K; Abe S
Ecological Research, May 2002, [Reviewed]
Effects of a grazing fish, Plecoglossus altivelis (Osmeridae), on the taxonomic composition of freshwater benthic algal assemblages
Abe, S; Uchida, K; Nagumo, T; Ioriya, T; Tanaka, J, Lead
Archive für Hydrobiologia, Mar. 2001, [Reviewed]
The cellular ability of desiccation tolerance in Japanese intertidal seaweeds
Abe, S; Kurashima, A; Yokohama, Y; Tanaka, J, Lead
Botanica Marina, Feb. 2001, [Reviewed]
Effects of current on the development of loosely and tightly attached layers in periphyton communities
Abe, S; Nagumo, T; Tanaka, J, Lead
Phycological Research, 2000, [Reviewed]
Grazing effects of ayu, Plecoglossus altivelis, on the species composition of benthic algal communities in the Kiso River.
Abe, S; Katano, O; Nagumo, N; Tanaka, J, Lead
Diatom, 2000, [Reviewed]
Interspecific interactions between ayu, Plecoglossus altivelis, and pale chub, Zacco platypus, in artificial streams
Katano, O; Abe, S; Matsuzaki, K; Iguchi, K
Fisheries Science, 2000, [Reviewed]
Distribution and characterization of bacteria capable of decomposing brown algae fronds in waters associated with Laminaria vegetation
Uchida, M; Abe, S.
Fisheries Science, 1995, [Reviewed]
