Yasuhiro Takemon

Two distinct genetic lineages of Drunella trispina (Uéno, 1928) (Ephemeroptera: Ephemerellidae) cohabit but are reproductively isolated in Kyoto, Japan

Minami Hamamura, Kei Wakimura, Yasuhiro Takemon, Shin’ichi Ishiwata et autres

Based on the analyses of mitochondrial cytochrome c oxidase ­subunit I (cox1) and nuclear 18S rRNA genes, we found two ­distinct genetic lineages of Drunella trispina (Uéno, Citation1928), which are ­morphologically indistinguishable at the nymphal stage. These two groups seem to have …

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Stable Isotope Analysis of the Contribution of Algae Grazing Fish, Ayu Plecoglossus altivelis, to the Food Supply of Macroinvertebrates

Shinji Takahashi, Hirokuni Goya, Shinichiro Abe, Yasuhiro Takemon et autres

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 …

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Faecal Pellets of the Endangered Amami Rabbit ( Pentalagus furnessi ) as an Allochthonous Resource for Benthic Macroinvertebrates in a Forest Stream in Amami‐Oshima Island, Japan

Shinji Takahashi, Shin‐ichiro Abe, Yasuhiro Takemon, Kei’ichiro Iguchi

ABSTRACT The endangered Amami rabbit (Pentalagus furnessi), endemic to two Japanese subtropical islands, has a habit of egesting faeces on streambanks in their habitats. We hypothesized that rabbit faeces transported into streams are consumed by aquatic animals. Underwater behavioural observations using time‐lapse …

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Sediment Corridors Connecting Forests, Rivers, Villages, and the Sea toward Integrated River Basin and Sediment Management.

Sakiko Yaegashi, Makoto Hyodo, Keisuke Yamada, Kei NUKAZAWA et autres

公開シンポジウム『森川里海をつなぐ「砂の道」-総合的な流域管 理に向けて-』 八重樫 咲子 1) , 2) , 3) ・兵藤 誠 1) , 2) , 4) ・山田 啓介 2) , 5) ・糠澤 桂 1) , 6) ・佐藤 辰郎 1) , 7) .8) ・ 篠原 隆一郎 1) , 9) ・小林 草平 1) , …

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Impact of the Japanese traditional river training structure “Seigyu (Crib spur dike)” on river morphology and its geometrical changes

Temma Fujii, Sameh A. Kantoush, Yasuhiro Takemon, Mahmood Mohamed Al mamari et autres

The traditional Japanese river training structure, known as “Seigyu”, designed to divert flow, reduce flow velocity, and promote geomorphological changes, is expected to contribute to the management of river morphology. Seigyu is highly impervious at the bottom giving it a unique function. …

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Cox1 -based phylogeny of Eastern Palearctic Drunella (Ephemeroptera: Ephemerellidae), description of new species and redescription of D. cryptomeria (Imanishi)

Kei Wakimura, Shin’ichi Ishiwata, Minami Hamamura, Yasuhiro Takemon et autres

The diversity of a mayfly genus, Drunella Needham (Ephemeroptera: Ephemerellidae), was examined using relationships of the barcode region of the cytochrome c oxidase subunit I (cox1) gene. Two novel species, Drunella campicola Ishiwata sp. nov. and Drunella parvicarnivora Ishiwata sp. nov. were …

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Stable isotope analysis of the contribution of algae grazing fish, Ayu Plecoglossus altivelis, to the food source supply of macroinvertebrates

Shinji Takahashi, Hirokuni Goya, Shinichiro Abe, Yasuhiro Takemon et autres

Attached algae are important primary producers in river ecosystems that are foraged by benthic macroinvertebrates and grazing fishes. The ayu Plecoglossus altivelis , which is an algae-feeding fish that feeds on attached algae. Fine particulate organic matter (FPOM) is generated when P. …

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Implications of taxonomic and numerical resolution on DNA metabarcoding-based inference of benthic macroinvertebrate responses to river restoration

Joeselle M. Serrana, Bin Li, Tetsuya Sumi, Yasuhiro Takemon et autres

Exploring and clearly defining the level of taxonomic identification and quantification approaches for diversity and biomonitoring studies are essential, given its potential influence on the assessment and interpretation of ecological outcomes. In this study, we evaluated the response of benthic macroinvertebrate communities …

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Impacts of the Japanese Traditional River Training Structure “Seigyu” on River Morphology and its Geometrical Changes

Temma Fujii, Sameh A. Kantoush, Yasuhiro Takemon, Mahmood Mohamed Al mamari et autres

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Short-term influences of flow alteration on microbial community structure and putative metabolic functions in gravel bar hyporheic zones

Arnelyn D. Doloiras-Laraño, Joeselle M. Serrana, Shinji Takahashi, Yasuhiro Takemon et autres

Microbial communities in the hyporheic zone are important for self-purification as the riverbed is metabolically active and responsible for the retention, storage, and mineralisation of organic matter transported in the surface water. Studies exploring the response of the hyporheic microbial community to …

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円山川の超過洪水時におけるリスク軽減のための計画的氾濫に関する研究

Sakai ONISHI, Tetsuya Sumi, Yasuhiro Takemon, Sameh KANTOUSH

This study examines a flood control countermeasure, premediated overflow, to increasing external flood forces. It's a flood mitigation measure to effectively use available low risk areas as floodplains under considering topography and property distribution in a watershed. Areas and flood retention volumes …

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Contribution of algae grazing fish, Ayu Plecoglossus altivelis altivelis, to supply food sources to macroinvertebrate by stable isotope analysis

Shinji Takahashi, Hirokuni Goya, Shinichiro Abe, Yasuhiro Takemon et autres

Attached algae are important primary producers in river ecosystems and are foraged by benthic macroinvertebrates and grazing fishes. The ayu Plecoglossus altivelis is an algae-feeding fish that feeds on attached algae and is an important fishery resource and conservation species in Japanese …

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