Tsuyoshi Takeuchi

Reexamining Sexual and Species Recognition in Butterflies: The Partner‐Hazard Space Framework

Tsuyoshi Takeuchi, Daisuke Muramatsu

Generally, intra- and inter-sexual interactions have been considered qualitatively different processes. However, same-sex sexual behavior is widespread in the animal kingdom, challenging this assumption. Recently, a hypothesis was proposed that regards territorial contests of butterflies, where two males chase each other without …

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Effects of alien host plant on wing coloration and mating behavior of an endangered butterfly

Karen Hisai, Masaya Yago, Shouhei Ueda, Tsuyoshi Takeuchi et autres

• The spectral reflectance of the wings differed between adults reared on the native and alien plants. • Wild males preferred butterflies reared on the native host during the courtship process. -It was possibly because of differences in the spectral reflectance of …

Association between confirmed COVID-19 cases at hospitals and SARS-CoV-2 levels in municipal wastewater during the pandemic and endemic phases

Keisuke Kagami, Masaaki Kitajima, Toshihiro Hamada, Yasunobu Kobayashi et autres

COVID-19 is now considered endemic in many countries. On May 8, 2023, Japan reclassified COVID-19 from a pandemic to an endemic status, shifting surveillance from universal to sentinel reporting and transitioning the testing and treatment cost of COVID-19 from public funding to …

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Bourgeois Strategy

Tsuyoshi Takeuchi

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Coil Embolization for Coronary Artery Perforation: A Retrospective Analysis of 110 Patients

Daisuke Hachinohe, Yoshifumi Kashima, Yuito Okada, Daitaro Kanno et autres

OBJECTIVE: Coil embolization (CE) for coronary artery perforation (CAP) has not been thoroughly evaluated. This study aimed to evaluate the extent of myocardial damage and impact on cardiac function after CE for CAP. METHODS: A total of 110 consecutive patients treated with …

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Comparison of Genetic Structure between Endangered and Common Butterflies, Ypthima multistriata and Y. argus (Lepidoptera; Nymphalidae), Inhabiting Japan

Yuto Hasegawa, Tsuyoshi Takeuchi, Shouhei Ueda, Norio Hirai

Genetic structures of two closely related butterflies, Ypthima multistriata and Y. argus, inhabiting Japan were compared based on the mitochondrial cytochrome c oxidase subunit I (COI) sequences. The former species is classified as a vulnerable species and exhibits a characteristic pattern of …

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Uncertainty about flying conspecifics causes territorial contests of the Old World swallowtail, Papilio machaon

Tsuyoshi Takeuchi, Shinji Yabuta, Hiroyuki Takasaki

Male-male aerial contests of territorial butterflies are difficult to explain by major contest models based on game theory because of butterflies’ apparent inability to inflict substantial costs on their opponent. As an alternative, the “erroneous courtship hypothesis” was presented. This hypothesis is …

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Low mitochondrial DNA variation in the endangered bumble beeBombus cryptarum florilegus

Tsuyoshi Takeuchi, Takuma Sasaki, Masahiro Mitsuhata, Takuya Kiyoshi et autres

The distribution of the bumble bee Bombus cryptarum florilegus is very local: Nemuro Peninsula and Notsuke Peninsula in Japan and the southern part of Chishima (Kuril) Islands. It is listed as a near-threatened species in the Japan Red List. In this study, …

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Variability of photosensitive period and voltinism among populations of a butterfly, Ypthima multistriata, inhabiting similar latitudes and altitudes

Yuto Hasegawa, Tsuyoshi Takeuchi, Norio Hirai

Abstract In Ypthima multistriata Butler (Lepidoptera: Nymphalidae), there are univoltine and bivoltine populations in adjacent areas with similar climatic conditions. A previous study revealed that larvae of both univoltine and bivoltine populations diapause under a constant short day (i.e., a constant short …

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Mating behavior of the Old World swallowtail, Papilio machaon

Tsuyoshi Takeuchi

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Additional file 3: of Uncertainty about flying conspecifics causes territorial contests of the Old World swallowtail, Papilio machaon

Tsuyoshi Takeuchi, Shinji Yabuta, Hiroyuki Takasaki

Data of response phase / duration (s) to each specimen. (XLSX 10 kb)

Origins of Vespa velutina hornets that recently invaded Iki Island, Japan and Jersey Island, UK

Junichi Takahashi, Hisashi Okuyama, Takuya Kiyoshi, Tsuyoshi Takeuchi et autres

J. Takahashia*, H. Okuyamaa, T. Kiyoshib, T. Takeuchia & S. J. Martinca Faculty of Life Sciences, Kyoto Sangyo University, Kyoto, Japan; b Department of Zoology, National Museum of Nature and Science, Tsukuba, Japan; c School of Environment and Life Sciences, The University …

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