Faculty of Environment and Information Sciences, Division of Natural Environment and Information

Job Title

Associate Professor

Research Fields, Keywords

Biological Oceanography, Plankton, Copepods

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Graduating School 【 display / non-display


    Yokohama National University   Faculty of Education   Graduated

Graduate School 【 display / non-display


    Kyoto University  Graduate School, Division of Natural Science  Doctor Course  Completed


    Yokohama National University  Graduate School, Division of Education  Master Course  Completed


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  • Effects of container size, density, and incubation period on ammonium excretion rate measurements of planktonic copepods: Validation with a highly sensitive analytical method

    Nakamura Ken-ichi, Takahashi Kazutaka, Shimode Shinji, Shimizu Yugo, Furuya Ken

    PLANKTON & BENTHOS RESEARCH ( 日本プランクトン学会、日本ベントス学会 )  14 ( 2 )   62 - 70   2019.05  [Refereed]

    Joint Work

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    <p>Ammonium excretion by planktonic copepods is an important process supplying nitrogen to primary producers and other microbial activity in pelagic ecosystems. Because of methodological constraints, conventional analyses using sealed chamber methods have required the adoption of unnatural experimental settings, such as a small container, high density, or a long incubation for ammonium excretion measurements. Therefore, most of the estimated ammonium excretion rates are potentially linked to stresses on the experimental animals during incubation. In this study, the effects of container size, density, and incubation period on the ammonium excretion rates of five copepod species (<i>Calanus sinicus, Eucalanus californicus, Metridia pacifica, Pleuromamma abdominalis, P. gracilis</i>) were examined using a highly sensitive analytical method that has recently been developed to measure ammonium concentration at the nanomolar level. The results indicate that responses to experimental stresses are species-specific, while incubation in a small container was generally the most significant factor causing overestimation (up to 2.6 times) of the excretion rates. This study shows that this highly sensitive analysis method, which allows short incubations with a single individual in a relatively large-sized container is an appropriate method to estimate ammonium excretion of pelagic copepods in the field using the sealed chamber method.</p>

    Web of Science DOI CiNii

  • Identification of molecular markers associated with starvation in female Calanus sinicus (Copepoda: Calanoida)

    Ohnishi Takuya, Hirai Junya, Shimode Shinji, Tsuda Atsushi

    MARINE ECOLOGY PROGRESS SERIES   614   51 - 65   2019.04  [Refereed]

    Joint Work

    Web of Science DOI

  • Dead heat: copepod carcass occurrence along the Japanese coasts and implications for a warming ocean

    Tang, K. W., Ivory, J. A., Shimode, S., Nishibe, Y., K. Takahashi

    ICES Journal of Marine Science     2019.03  [Refereed]

    Joint Work


  • First record of Acartia japonica Mori, 1940 (Copepoda, Calanoida) from Sagami Bay, the Pacific coast of Japan

    Takayama Yoshiki, Nakamura Ken-ichi, Shimode Shinji, Toda Tatsuki

    Coastal Marine Science   41 ( 1 )   11 - 14   2018.08  [Refereed]

    Joint Work

  • Seasonal variations in microbial abundance and transparent exopolymer particle concentration in the sea surface microlayer of temperate coastal waters

    Sugai Youta, Tsuchiya Kenji, Shimode Shinji, Toda Tatsuki

    AQUATIC MICROBIAL ECOLOGY   81 ( 3 )   201 - 211   2018

    Joint Work

    Web of Science DOI

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