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• Molecular and neurobiological analyses of the circatidal clock mechanism in the mangrove cricket Apteronemobius asahinai

  2014.03

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Published Papers 【 display / non-display 】

• Wickerhamiella bidentis sp. nov., a novel yeast species isolated from flowers and insects in Japan.

  Seike T, Takekata H, Uchida Y, Sakata N, Furusawa C, Matsuda F

  International journal of systematic and evolutionary microbiology ( International Journal of Systematic and Evolutionary Microbiology )  73 ( 3 )   2023.03 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Two strains were isolated from flowers and insects in Japan, namely NBRC 115686T and NBRC 115687, respectively. Based on sequence analysis of the D1/D2 domain of the 26S large subunit (LSU) rRNA gene and the internal transcribed spacer (ITS) region and physiological characteristics, these strains were found to represent a novel yeast species of the genus Wickerhamiella. Considering pairwise sequence similarity, NBRC 115686T and NBRC 115687 differ from the type strain of the most closely related species, Wickerhamiella galacta NRRL Y-17645T, by 65-66 nucleotide substitutions with 12 gaps (11.65-11.83 %) in the D1/D2 domain of the LSU rRNA gene. The novel species differ from the closely related Wickerhamiella species in some physiological characteristics. For example, compared with Wickerhamiella galacta JCM 8257T, NBRC 115686T and NBRC 115687 assimilated d-galactose, and could grow at 35 and 37 °C. Hence, the name Wickerhamiella bidentis sp. nov. is proposed to accommodate this species in the genus Wickerhamiella. The holotype is NBRC 115686T (ex-type strain JCM 35540=CBS 18008).

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• Transcriptome Analysis in a Scleractinian Coral, Acropora tenuis, during the Spawning Season With Reference to the Gonadal Condition.

  Takekata H, Hamazato H, Suan TE, Izumi R, Yaguchi H, Matsunami M, Isomura N, Takemura A

  Zoological science ( Zoological Science )  39 ( 6 ) 570 - 580   2022.12 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Distinct decision-making properties underlying the species specificity of group formation of flies.

  Shirasaki R, Tanaka R, Takekata H, Shimada T, Ishikawa Y, Kamikouchi A

  Royal Society open science ( Royal Society Open Science )  9 ( 8 ) 220042   2022.08 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Many animal species form groups. Group characteristics differ between species, suggesting that the decision-making of individuals for grouping varies across species. However, the actual decision-making properties that lead to interspecific differences in group characteristics remain unclear. Here, we compared the group formation processes of two Drosophilinae fly species, Colocasiomyia alocasiae and Drosophila melanogaster , which form dense and sparse groups, respectively. A high-throughput tracking system revealed that C. alocasiae flies formed groups faster than D. melanogaster flies, and the probability of C. alocasiae remaining in groups was far higher than that of D. melanogaster . C. alocasiae flies joined groups even when the group size was small, whereas D. melanogaster flies joined groups only when the group size was sufficiently large. C. alocasiae flies attenuated their walking speed when the inter-individual distance between flies became small, whereas such behavioural properties were not clearly observed in D. melanogaster . Furthermore, depriving C. alocasiae flies of visual input affected grouping behaviours, resulting in a severe reduction in group formation. These findings show that C. alocasiae decision-making regarding grouping, which greatly depends on vision, is significantly different from D. melanogaster , leading to species-specific group formation properties.

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• Effects of light-emitting diode wavelengths on reproduction in <i>Acropora intermedia</i> and <i>A. muricata</i>

  INOHA Keisuke, TAN Ee Suan, IZUMI Ryotaro, TAKEKATA Hiroki, TAKEMURA Akihiro, ISOMURA Naoko

  Japanese Journal of Benthology ( JAPANESE ASSOCIATION OF BENTHOLOGY )  76 ( 0 ) 59 - 72   2021.12

  Type of publication: Research paper (scientific journal)

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  <p>Corals are known to synchronously undergo gonadal development during a period of 1 year and release gametes simultaneously during the spawning season. Synchronization of reproduction may be caused by changes in the external environment; particularly, the effects of light on reproduction have been extensively reported. In this study, we specifically focused on the type of wavelength, with the intention to elucidate whether there are wavelengths that promote reproduction in two <i>Acropora</i>. We exposed coral colonies to four types of light-emitting diode conditions with wavelengths suitable for keeping coral: “Coral," “Reef," “Fresh," and “Sunset," and monitored gamete maturation every 3 months, as well as the number of released gametes during the spawning season. In <i>A. intermedia</i>, “Sunset" conditions promoted gamete maturation; however, there was no spawning observed. In contrast, in <i>A. muricata</i>, the same conditions promoted a series of processes ranging from gamete maturation to gamete release. In “Fresh" and “Coral" conditions, gamete maturation was also promoted. “Sunset" condition is characterized by longer wavelengths within the red-light visible spectrum, which is relatively predominant in the shallow waters where the two target species live. Therefore, this indicates that these longer wavelengths represent a light stimulus that promotes reproduction. By contrast, gamete maturation was promoted by even shorter wavelengths in <i>A. muricata</i>; therefore, further experiments considering different light sensitivities among species and growth promotion through the photosynthesis of zooxanthellae are recommended. It is also suggested that, in addition to wavelength type, spawning may be affected by water temperature increase after winter season.</p>

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• Ovarian Development and Larval Release of the Hermit Crab <i>Clibanarius eurysternus</i> (Hilgendorf, 1879) (Decapoda: Anomura: Diogenidae) in Okinawa, Japan.

  Osaka N, Chihara S, Yamauchi C, Takekata H, Takemura A

  Zoological science ( Zoological Science )  38 ( 6 ) 558 - 564   2021.12 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• Automatic Behavioral Analysis of Barnacles

  2022.12  -  2022.12 

• Period expression pattePeriod expression pattern in the brain with growth of the tropical grouper,

  2022.12  -  2022.12 

• Circatidal Activity Rhythms of Fistulobalanus albicostatus on Okinawa Island

  2021.11  -  2021.11 

• Elucidation of the water pressure transduction in threespot wrasse

  2021.11  -  2021.11 

• Expression changes associated with oogenesis of sex steroid hormone synthase 17B-HSD in Acropora tenuis

  2021.09  -  2021.09 

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• Grant-in-Aid for Scientific Research(C)

  Project Year: 2023.04  -  2026.03 

  Direct: 3,700,000 (YEN)  Overheads: 4,810,000 (YEN)  Total: 1,110,000 (YEN)

• Interplay between nutrition and reproduction in the neuroendocrine network of fish under tropical monsoon environments

  International joint research accelerated Fund (International Collaboration strengthening)

  Project Year: 2020.10  -  2024.03 

  Direct: 14,400,000 (YEN)  Overheads: 4,320,000 (YEN)  Total: 18,720,000 (YEN)

• Interplay between nutrition and reproduction in the neuroendocrine network of fish under tropical monsoon environments

  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

  Project Year: 2020.10  -  2024.03 

  Direct: 14,400,000 (YEN)  Overheads: 18,720,000 (YEN)  Total: 4,320,000 (YEN)

• Interplay between nutrition and reproduction in the neuroendocrine network of fish under tropical monsoon environments

  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

  Project Year: 2020.10  -  2024.03 

  Direct: 14,400,000 (YEN)  Overheads: 18,720,000 (YEN)  Total: 4,320,000 (YEN)

• Interplay between nutrition and reproduction in the neuroendocrine network of fish under tropical monsoon environments

  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

  Project Year: 2020.10  -  2024.03 

  Direct: 14,400,000 (YEN)  Overheads: 18,720,000 (YEN)  Total: 4,320,000 (YEN)

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