Details of the Researcher

PHOTO

Yutaka Osada
Section
Advanced Institute for Marine Ecosystem Change
Job title
Associate Professor

Research History 7

  • 2025/04 - Present
    Tohoku University　Advanced Institute for Marine Ecosystem Change　Associate Professor

  • 2024/04 - 2025/03
    Tohoku University　Advanced Institute for Marine Ecosystem Change　Assistant Professor

  • 2022/04 - 2024/03
    Tohoku University　Graduate School of Life Sciences Department of Ecological Developmental Adaptability Life Sciences　Assistant Professor

  • 2019/12 - 2022/03
    Japan Fisheries Research and Education Agency　Fisheries Stock Assessment Center　Researcher

  • 2018/04 - 2019/11
    Tohoku University　Graduate School of Life Sciences Department of Ecological Developmental Adaptability Life Sciences　Assistant Professor

  • 2015/04 - 2018/03
    Research Institute for Humanity and Nature　RIHN Center　Researcher

  • 2014/04 - 2015/03
    The University of Tokyo　Graduate School of Agricultural and Life Sciences　Researcher

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Education 1

  • The University of Tokyo　Graduate School of Agricultural and Life Sciences　Department of Ecosystem Studies

    2011/04 - 2014/03

Research Areas 1

  • Life sciences / Ecology and environmental science /

Papers 33

  1. Large-scale environmental DNA survey reveals niche axes of a regional coastal fish community

    Yutaka Osada, Masaki Miya, Hitoshi Araki, Hideyuki Doi, Akihide Kasai, Reiji Masuda, Toshifumi Minamoto, Satoquo Seino, Teruhiko Takahara, Satoshi Yamamoto, Hiroki Yamanaka, Mitsuhiro Aizu-Hirano, Keiichi Fukaya, Takehiko Fukuchi, Ryo O. Gotoh, Masakazu Hori, Midori Iida, Tomohito Imaizumi, Tadashi Kajita, Takashi Kanbe, Tanaka Kenta, Yumi Kobayashi, Tomohiko Matsuura, Hiroki Mizumoto, Hiroyuki Motomura, Hiroaki Murakami, Kenji Nohara, Shin-ichiro Oka, Tetsuya Sado, Hiroshi Senou, Koichi Shibukawa, Tomoki Sunobe, Hiroshi Takahashi, Koji Takayama, Katsuhiko Tanaka, Hisashi Yamakawa, Satoru Yokoyama, Seokjin Yoon, Michio Kondoh

    Scientific Reports　16　(1)　2026/02/16

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41598-025-31307-4 　

    eISSN： 2045-2322

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    Abstract The concept of the ecological niche, defined as the basic habitat requirements for a species, is central to understanding species geographic distributions and predicting their responses to environmental change. However, identifying the essential niche for large regional communities remains a challenge because niche axes can be “hidden” by the complexity of the underlying ecological processes. Here, applying advanced species distribution modelling to nationwide environmental DNA survey data, we identified hidden niche axes of the Japanese coastal fish community and investigated the response diversity to these axes. Our survey detected 1,220 coastal fish species. The hidden niche axes collectively explained most of the variation in fish biodiversity and revealed five biogeographic boundaries for the regional community. These niches of the Japanese fish community may primarily relate to several processes due to ocean currents, such as environmental filters, transport from source areas and dispersal barriers. We also found that the response diversity to niche axes was positively correlated with species richness, although local communities with particularly high response diversity were geographically biased. A better understanding of the niche axes of the regional ecological community should help to mitigate the loss of biodiversity and ecosystem services caused by ongoing environmental change.

  2. Estimating spatiotemporal reproductive dynamics of fish populations with passive acoustic monitoring: A state-space model approach Peer-reviewed

    Keisuke Ota, Tomonari Akamatsu, Yutaka Osada, Michio Kondoh

    METHODS IN ECOLOGY AND EVOLUTION　2026/01/11

    DOI： 10.1111/2041-210x.70230 　

    ISSN： 2041-210X

    eISSN： 2041-2096

  3. Fine-scale reconstruction of pelagic fish migration by iso-logging of eye lens Peer-reviewed

    Jun Matsubayashi, Yutaka Osada, Katsuya Kimura, Yoshinori Aoki, Makoto Okazaki, Tetsuro Senda, Yuya Ueda, Naoto Matsubara, Yuichi Tsuda

    METHODS IN ECOLOGY AND EVOLUTION　17　(1)　77-84　2026/01

    DOI： 10.1111/2041-210x.70201 　

    ISSN： 2041-210X

    eISSN： 2041-2096

  4. Quantifying and exploring state-dependent ecological interactions from time series data using Gaussian process regression Peer-reviewed

    Taiju Yukihira, Yutaka Osada, Michio Kondoh

    JOURNAL OF THE ROYAL SOCIETY INTERFACE　22　(228)　2025/07/09

    DOI： 10.1098/rsif.2025.0154 　

    ISSN： 1742-5689

    eISSN： 1742-5662

  5. Electrical integrity and week-long oscillation in fungal mycelia Peer-reviewed

    Yu Fukasawa, Daisuke Akai, Takayuki Takehi, Yutaka Osada

    SCIENTIFIC REPORTS　14　(1)　2024/07/06

    DOI： 10.1038/s41598-024-66223-6 　

    ISSN： 2045-2322

  6. Synthetic model ecosystem of 12 cryopreservable microbial species allowing for a noninvasive approach. International-journal Peer-reviewed

    Kazufumi Hosoda, Shigeto Seno, Naomi Murakami, Hideo Matsuda, Yutaka Osada, Rikuto Kamiura, Michio Kondoh

    Bio Systems　235　105087-105087　2023/11/19

    DOI： 10.1016/j.biosystems.2023.105087 　

    ISSN： 0303-2647

    eISSN： 1872-8324

  7. Temperature sensitivity of the interspecific interaction strength of coastal marine fish communities Peer-reviewed

    Masayuki Ushio, Tetsuya Sado, Takehiko Fukuchi, Sachia Sasano, Reiji Masuda, Yutaka Osada, Masaki Miya

    eLife　12　RP85795　2023/07/11

    Publisher: eLife Sciences Publications, Ltd

    DOI： 10.7554/elife.85795 　

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    The effects of temperature on interaction strengths are important for understanding and forecasting how global climate change impacts marine ecosystems; however, tracking and quantifying interactions of marine fish species is practically difficult especially under field conditions, and thus, how temperature influences their interaction strengths under field conditions remains poorly understood. We herein performed quantitative fish environmental DNA (eDNA) metabarcoding on 550 seawater samples that were collected twice a month from 11 coastal sites for two years in the Boso Peninsula, Japan, and analyzed eDNA monitoring data using nonlinear time-series analytical tools. We detected fish-fish interactions as information flow between eDNA time series, reconstructed interaction networks for the top 50 frequently detected species, and quantified pairwise, fluctuating interaction strengths. Although there was a large variation, water temperature influenced fish-fish interaction strengths. The impact of water temperature on interspecific interaction strengths varied among fish species, suggesting that fish species identity influences the temperature effects on interactions. For example, interaction strengths that Halichoeres tenuispinis and Microcanthus stringatus received strongly increased with water temperature, while those of Engraulis japonicus and Girella punctata decreased with water temperature. An increase in water temperature induced by global climate change may change fish interactions in a complex way, which consequently influences marine community dynamics and stability. Our research demonstrates a practical research framework to study the effects of environmental variables on interaction strengths of marine communities in nature, which would contribute to understanding and predicting natural marine ecosystem dynamics.

  8. Dynamics-based characterization and classification of biodiversity indicators. International-journal Peer-reviewed

    Yuri Otomo, Reiji Masuda, Yutaka Osada, Kazutaka Kawatsu, Michio Kondoh

    Ecology and evolution　13　(7)　e10271　2023/07

    DOI： 10.1002/ece3.10271 　

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    Various biodiversity indicators, such as species richness, total abundance, and species diversity indices, have been developed to capture the state of ecological communities over space and time. As biodiversity is a multifaceted concept, it is important to understand the dimension of biodiversity reflected by each indicator for successful conservation and management. Here we utilized the responsiveness of biodiversity indicators' dynamics to environmental changes (i.e., environmental responsiveness) as a signature of the dimension of biodiversity. We present a method for characterizing and classifying biodiversity indicators according to environmental responsiveness and apply the methodology to monitoring data for a marine fish community under intermittent anthropogenic warm water discharge. Our analysis showed that 10 biodiversity indicators can be classified into three super-groups based on the dimension of biodiversity that is reflected. Group I (species richness and community mean of latitudinal center of distribution (cCOD)) showed the greatest robustness to temperature changes; Group II (species diversity and total abundance) showed an abrupt change in the middle of the monitoring period, presumably due to a change in temperature; Group III (species evenness) exhibited the highest sensitivity to environmental changes, including temperature. These results had several ecological implications. First, the responsiveness of species diversity and species evenness to temperature changes might be related to changes in the species abundance distribution. Second, the similar environmental responsiveness of species richness and cCOD implies that fish migration from lower latitudes is a major driver of species compositional changes. The study methodology may be useful in selecting appropriate indicators for efficient biodiversity monitoring.

  9. Reconstruction of a Soil Microbial Network Induced by Stress Temperature Peer-reviewed

    Dailin Yang, Hiromi Kato, Kazutaka Kawatsu, Yutaka Osada, Toyohiro Azuma, Yuji Nagata, Michio Kondoh

    Microbiology Spectrum　10　(5)　2022/10/26

    Publisher: American Society for Microbiology

    DOI： 10.1128/spectrum.02748-22 　

    eISSN： 2165-0497

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    By combining amplicon-based diversity survey with recently developed nonlinear analytical tools, we successfully determined the interaction networks of more than 150 natural soil microbial genera under less or more temperature stress and explored the applicability of the stress gradient hypothesis to soil microbiota, shedding new light on the well-known hypothesis.

  10. Novel robust time series analysis for long-term and short-term prediction Peer-reviewed

    Hiroshi Okamura, Yutaka Osada, Shota Nishijima, Shinto Eguchi

    Scientific Reports　11　(1)　2021/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41598-021-91327-8 　

    eISSN： 2045-2322

  11. Diagnosing underdetermination in stable isotope mixing models Peer-reviewed

    Yutaka Osada, Jun Matsubayashi, Ichiro Tayasu

    PLOS ONE　16　(10)　e0257818-e0257818　2021/10/01

    Publisher: Public Library of Science (PLoS)

    DOI： 10.1371/journal.pone.0257818 　

    eISSN： 1932-6203

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    Stable isotope mixing models (SIMMs) provide a powerful methodology for quantifying relative contributions of several sources to a mixture. They are widely used in the fields of ecology, geology, and archaeology. Although SIMMs have been rapidly evolved in the Bayesian framework, the underdetermination of mixing space remains problematic, i.e., the estimated relative contributions are incompletely identifiable. Here we propose a statistical method to quantitatively diagnose underdetermination in Bayesian SIMMs, and demonstrate the applications of our method (named <italic>β</italic>-dependent SIMM) using two motivated examples. Using a simulation example, we showed that the proposed method can rigorously quantify the expected underdetermination (i.e., intervals of <italic>β</italic>-dependent posterior) of relative contributions. Moreover, the application to the published field data highlighted two problematic aspects of the underdetermination: 1) ordinary SIMMs was difficult to quantify underdetermination of each source, and 2) the marginal posterior median was not necessarily consistent with the joint posterior peak in the case of underdetermination. Our study theoretically and numerically confirmed that <italic>β</italic>-dependent SIMMs provide a useful diagnostic tool for the underdetermined mixing problem. In addition to ordinary SIMMs, we recommend reporting the results of <italic>β</italic>-dependent SIMMs to obtain a biologically feasible and sound interpretation from stable isotope data.

  12. Estimating fish population abundance by integrating quantitative data on environmental DNA and hydrodynamic modelling Peer-reviewed

    Keiichi Fukaya, Hiroaki Murakami, Seokjin Yoon, Kenji Minami, Yutaka Osada, Satoshi Yamamoto, Reiji Masuda, Akihide Kasai, Kazushi Miyashita, Toshifumi Minamoto, Michio Kondoh

    Molecular Ecology　30　(13)　3057-3067　2021/07

    Publisher: Wiley

    DOI： 10.1111/mec.15530 　

    ISSN： 0962-1083

    eISSN： 1365-294X

  13. Segmental isotope analysis of the vertebral centrum reveals the spatiotemporal population structure of adult Japanese flounder Paralichthys olivaceus in Sendai Bay, Japan Peer-reviewed

    Yoshikazu Kato, Hiroyuki Togashi, Yutaka Kurita, Yutaka Osada, Yosuke Amano, Chikage Yoshimizu, Hiromitsu Kamauchi, Ichiro Tayasu

    Marine Biology　168　(5)　2021/05

    DOI： 10.1007/s00227-021-03868-1 　

    ISSN： 0025-3162

    eISSN： 1432-1793

  14. Is harvest size a valid indirect measure of abundance for evaluating the population size of game animals using harvest-based estimation? Peer-reviewed

    Keita Fukasawa, Yutaka Osada, Hayato Iijima

    Wildlife Biology　2020　(4)　2020/12/07

    Publisher: Wiley

    DOI： 10.2981/wlb.00708 　

    ISSN： 0909-6396

  15. A model ecosystem of twelve cryopreservable microbial species allowing for a non-invasive approach

    Kazufumi Hosoda, Shigeto Seno, Naomi Murakami, Hideo Matsuda, Yutaka Osada, Michio Kondoh

    2020/10/23

    Publisher: Cold Spring Harbor Laboratory

    DOI： 10.1101/2020.10.23.351742 　

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    Abstract We developed a synthetic ecosystem of 12 cryopreservable microbial species with diverse interactions as an experimental “model ecosystem.” We created a machine learning model that noninvasively distinguished the 12 species on micrographs enabling high-throughput measurements. Our synthetic ecosystems maintained a certain diversity for at least six months.

  16. A data-driven approach to complex ecological systems

    Michio Kondoh, Kazutaka Kawatsu, Yutaka Osada, Masayuki Ushio

    Theoretical Ecology　116-133　2020/05/14

    Publisher: Oxford University Press

    DOI： 10.1093/oso/9780198824282.003.0008 　

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    <p>Interspecific interaction has been a key concept in ecology to understand the structure and dynamics of ecological communities. Important, yet often overlooked, is that an interspecific interaction is a product of multiple biological processes at various temporal and spatial scales, including changes in demographic parameters such as birth and death rates, behavioral responses such as inter-habitat movements, and hiding and evolutionary responses in a longer temporal scale. Each of those mechanisms, according to ecological theory, potentially affects population dynamics and modifies the community-level properties such as community complexity and stability in different manners. Here, a question arises: how does the net interspecific interaction, which is made up with those multiple processes, look like in the real nature? How do changes depend on the temporal or spatial scale? In this chapter we show that a data-driven approach using demographic time series is a powerful tool to answer those questions. According to nonlinear dynamics theory, a time series of a variable contains information about the dynamic system that the variable belongs to. We can use this fact to identify interspecific interactions, quantify their signs and strengths and evaluate its effect to community-level dynamic properties. Some results we got by applying the time-series analysis based on nonlinear dynamics theory (called Empirical Dynamic Modeling) to empirical demographic data, experimental or observational, will be presented, which will demonstrate how fluctuating and condition-dependent the real interactions are and reveal how those interactions give rise to the dynamic properties at higher organization levels.</p>

  17. Tracking long-distance migration of marine fishes using compound-specific stable isotope analysis of amino acids. International-journal Peer-reviewed

    Jun Matsubayashi, Yutaka Osada, Kazuaki Tadokoro, Yoshiyuki Abe, Atsushi Yamaguchi, Kotaro Shirai, Kentaro Honda, Chisato Yoshikawa, Nanako O Ogawa, Naohiko Ohkouchi, Naoto F Ishikawa, Toshi Nagata, Hiroomi Miyamoto, Shigeto Nishino, Ichiro Tayasu

    Ecology letters　2020/03/24

    DOI： 10.1111/ele.13496 　

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    The long-distance migrations by marine fishes are difficult to track by field observation. Here, we propose a new method to track such migrations using stable nitrogen isotopic composition at the base of the food web (δ15 NBase ), which can be estimated by using compound-specific isotope analysis. δ15 NBase exclusively reflects the δ15 N of nitrate in the ocean at a regional scale and is not affected by the trophic position of sampled organisms. In other words, δ15 NBase allows for direct comparison of isotope ratios between proxy organisms of the isoscape and the target migratory animal. We initially constructed a δ15 NBase isoscape in the northern North Pacific by bulk and compound-specific isotope analyses of copepods (n = 360 and 24, respectively), and then we determined retrospective δ15 NBase values of spawning chum salmon (Oncorhynchus keta) from their vertebral centra (10 sections from each of two salmon). We then estimated the migration routes of chum salmon during their skeletal growth by using a state-space model. Our isotope tracking method successfully reproduced a known chum salmon migration route between the Okhotsk and Bering seas, and our findings suggest the presence of a new migration route to the Bering Sea Shelf during a later growth stage.

  18. Dynamic and synergistic influences of air temperature and rainfall on general flowering in a Bornean lowland tropical forest Peer-reviewed

    Masayuki Ushio, Yutaka Osada, Tomo'omi Kumagai, Tomonori Kume, Runi anak Sylvester Pungga, Tohru Nakashizuka, Takao Itioka, Shoko Sakai

    Ecological Research　35　(1)　17-29　2020/01

    DOI： 10.1111/1440-1703.12057 　

    ISSN： 0912-3814

    eISSN： 1440-1703

  19. Organic farming and associated management practices benefit multiple wildlife taxa: A large-scale field study in rice paddy landscapes Peer-reviewed

    Katayama Naoki, Osada Yutaka, Mashiko Miyuki, Baba Yuki G, Tanaka Koichi, Kusumoto Yoshinobu, Okubo Satoru, Ikeda Hiroaki, Natuhara Yosihiro

    JOURNAL OF APPLIED ECOLOGY　56　(8)　1970-1981　2019/08

    DOI： 10.1111/1365-2664.13446 　

    ISSN： 0021-8901

  20. Estimating range expansion of wildlife from spatial-temporal data in heterogeneous landscapes: a spatially explicit state-space matrix model coupled with an improved numerical integration technique. Peer-reviewed

    Osada, Y, T. Kuriyama, M. Asada, H. Yokomizo, T. Miyashita

    Ecology and Evolution　9　(1)　318-327　2019/01

    DOI： 10.1002/ece3.4739 　

  21. Disentangling the drivers of invasion spread in a vector-borne tree disease Peer-reviewed

    Osada Yutaka, Yamakita Takehisa, Shoda-Kagaya Etsuko, Liebhold Andrew M, Yamanaka Takehiko

    JOURNAL OF ANIMAL ECOLOGY　87　(6)　1512-1524　2018/11

    DOI： 10.1111/1365-2656.12884 　

    ISSN： 0021-8790

  22. Utility of Nd isotope ratio as a tracer of marine animals: regional variation in coastal seas and causal factors Peer-reviewed

    Yu Saitoh, Takanori Nakano, Ki‐Cheol Shin, Jun Matsubayashi, Yoshikazu Kato, Hiroshi Amakawa, Yutaka Osada, Chikage Yoshimizu, Noboru Okuda, Yosuke Amano, Hiroyuki Togashi, Yutaka Kurita, Ichiro Tayasu

    Ecosphere　9　(8)　2018/08

    Publisher: Wiley

    DOI： 10.1002/ecs2.2365 　

    ISSN： 2150-8925

    eISSN： 2150-8925

  23. Using food network unfolding to evaluate food–web complexity in terms of biodiversity: theory and applications Peer-reviewed

    Yoshikazu Kato, Michio Kondoh, Naoto F. Ishikawa, Hiroyuki Togashi, Yukihiro Kohmatsu, Mayumi Yoshimura, Chikage Yoshimizu, Takashi F. Haraguchi, Yutaka Osada, Nobuhito Ohte, Naoko Tokuchi, Noboru Okuda, Takeshi Miki, Ichiro Tayasu

    Ecology Letters　21　(7)　1065-1074　2018/07/01

    DOI： 10.1111/ele.12973 　

    ISSN： 1461-0248 1461-023X

    eISSN： 1461-0248

  24. Exploring the drivers of wild boar population dynamics using a state-space model with Bayesian model averaging Invited Peer-reviewed

    Yutaka Osada, Takeo Kuriyama, Masahiko Asada, Hiroyuki Yokomizo, Tadashi Miyashita

    Japanese Journal of Conservation Ecology　23　(1)　29-38　2018/05

    DOI： 10.18960/hozen.23.1_29 　

    ISSN： 1342-4327

  25. Effect of the invasive raccoon and civet on the native raccoon dog based on the population densities Invited Peer-reviewed

    Takeo Kuriyama, Mika Koido, Yutaka Osada, Masahiko Asada, Hiroyuki Yokomizo, Tadashi Miyashita

    Japanese Journal of Conservation Ecology　23　(1)　9-17　2018/05

    DOI： 10.18960/hozen.23.1_9 　

  26. Global diurnal and nocturnal parameters of stomatal conductance in woody plants and major crops Peer-reviewed

    Yasutomo Hoshika, Yutaka Osada, Alessandra de Marco, Josep Peñuelas, Elena Paoletti

    Global Ecology and Biogeography　27　(2)　257-275　2018/02/01

    DOI： 10.1111/geb.12681 　

    ISSN： 1466-8238 1466-822X

  27. Incremental analysis of vertebral centra can reconstruct the stable isotope chronology of teleost fishes Peer-reviewed

    Jun Matsubayashi, Yu Saitoh, Yutaka Osada, Yoshitoshi Uehara, Junko Habu, Tsuyoshi Sasaki, Ichiro Tayasu

    METHODS IN ECOLOGY AND EVOLUTION　8　(12)　1755-1763　2017/12

    DOI： 10.1111/2041-210X.12834 　

    ISSN： 2041-210X

    eISSN： 2041-2096

  28. The forecasting of menstruation based on a state-space modeling of basal body temperature time series Peer-reviewed

    Keiichi Fukaya, Ai Kawamori, Yutaka Osada, Masumi Kitazawa, Makio Ishiguro

    STATISTICS IN MEDICINE　36　(21)　3361-3379　2017/09

    DOI： 10.1002/sim.7345 　

    ISSN： 0277-6715

    eISSN： 1097-0258

  29. Exploring the drivers of wildlife population dynamics from insufficient data by Bayesian model averaging Peer-reviewed

    Yutaka Osada, Takeo Kuriyama, Masahiko Asada, Hiroyuki Yokomizo, Tadashi Miyashita

    POPULATION ECOLOGY　57　(3)　485-493　2015/07

    DOI： 10.1007/s10144-015-0498-x 　

    ISSN： 1438-3896

    eISSN： 1438-390X

  30. Dietary Compositions and Their Seasonal Shifts in Japanese Resident Birds, Estimated from the Analysis of Volunteer Monitoring Data Peer-reviewed

    Tetsuro Yoshikawa, Yutaka Osada

    PLOS ONE　10　(2)　2015/02

    DOI： 10.1371/journal.pone.0119324 　

    ISSN： 1932-6203

  31. Habitat connectivity and resident shared predators determine the impact of invasive bullfrogs on native frogs in farm ponds Peer-reviewed

    Takashi Atobe, Yutaka Osada, Hayato Takeda, Misako Kuroe, Tadashi Miyashita

    PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES　281　(1786)　2014/07

    DOI： 10.1098/rspb.2013.2621 　

    ISSN： 0962-8452

    eISSN： 1471-2954

  32. IsoWeb: A Bayesian Isotope Mixing Model for Diet Analysis of the Whole Food Web Peer-reviewed

    Taku Kadoya, Yutaka Osada, Gaku Takimoto

    PLOS ONE　7　(7)　2012/07

    DOI： 10.1371/journal.pone.0041057 　

    ISSN： 1932-6203

  33. The effect of host web complexity on prey-stealing success in a kleptoparasitic spider mediated by locomotor ability Peer-reviewed

    Yuki G. Baba, Yutaka Osada, Tadashi Miyashita

    ANIMAL BEHAVIOUR　83　(5)　1261-1268　2012/05

    DOI： 10.1016/j.anbehav.2012.02.019 　

    ISSN： 0003-3472

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Misc. 35

  1. Cascading regime shift in the freshwater phytoplankton community

    FUKASAWA Riku, KAWATSU Kazutaka, OSADA Yutaka, KONDOH Michio, KONDOH Michio

    日本生態学会大会講演要旨(Web)　72nd　2025

  2. Species number ratio of mutualistic systems in terms of ecological resilience

    笠原剛樹, 長田穣, 近藤倫生

    日本生態学会大会講演要旨(Web)　72nd　2025

  3. An equation-free Bayesian method for the inference of state-dependent ecological interactions with time series data

    YUKIHIRA Taiju, OSADA Yutaka, KONDOH Michio

    日本生態学会大会講演要旨(Web)　71st　2024

  4. Dynamics-based characterization of biodiversity indicators based on environmental responsiveness

    OTOMO Yuri, MASUDA Reiji, OSADA Yutaka, KAWATSU Kazutaka, KONDOH Michio

    日本生態学会大会講演要旨(Web)　71st　2024

  5. Classification of Community Indicators Based on Context-Dependence in Dynamics

    OTOMO Yuri, MASUDA Reiji, OSADA Yutaka, KAWATSU Kazutaka, KONDOH Michio

    日本生態学会大会講演要旨(Web)　70th　2023

  6. 文脈依存的な種間相互作用の時系列データからの推定

    行平大樹, 長田穣, 近藤倫生

    個体群生態学会大会プログラム・講演要旨集(Web)　39th　2023

  7. Estimation of fish distributions in rivers using environmental DNA: a hierarchical Bayesian modeling with DNA dynamics

    伊藤青葉, 香川裕之, 成田勝, 長田穣, 近藤倫生

    日本生態学会大会講演要旨(Web)　69th　2022

  8. Context-dependency of fish population dynamics: A nonlinear time series analysis of long-term observation data from a nuclear power plant coastal area

    大友優里, 益田玲爾, 長田穣, 川津一隆, 近藤倫生

    日本生態学会大会講演要旨(Web)　69th　2022

  9. Nonlinear time-series analysis of structural instability against changing environments in a property of whole fish community

    大友優里, 益田玲爾, 長田穣, 川津一隆, 近藤倫生

    日本生態学会大会講演要旨(Web)　68th　2021

  10. Modeling the distribution and abundance of river fish using environmental DNA metabarcoding data.

    遠藤智也, 香川裕之, 成田勝, 長田穣, 近藤倫生

    日本生態学会大会講演要旨(Web)　68th　2021

  11. Stochastic phenomena due to evolution or keystone species in a synthetic ecosystem of 12 species microorganisms

    細田一史, 瀬尾茂人, 村上なおみ, 長田穣, 松田秀雄, 近藤倫生

    日本生態学会大会講演要旨(Web)　68th　2021

  12. 非線形時系列解析から読み解く,群集スケールでの状況依存性

    大友優里, 益田玲爾, 長田穣, 川津一隆, 近藤倫生

    個体群生態学会大会プログラム・講演要旨集(Web)　37th　2021

  13. 環境DNA用いたを河川の魚類分布の推定:DNAの動態を考慮したモデリング

    伊藤青葉, 香川裕之, 成田勝, 長田穣, 近藤倫生

    個体群生態学会大会プログラム・講演要旨集(Web)　37th　2021

  14. Connecting biological evolution and ecosystem change through experimental model ecosystems.

    細田一史, 瀬尾茂人, 村上なおみ, 長田穣, 松田秀雄, 古澤力, 古澤力, 近藤倫生

    日本分子生物学会年会プログラム・要旨集(Web)　44th　2021

  15. Stochastic phenomena in synthetic ecosystems of 12 microbial species with a trophic structure

    HOSODA Kazufumi, MURAKAMI Naomi, SENO Shigeto, OSADA Yutaka, MATSUDA Hideo, FURUSAWA Chikara, FURUSAWA Chikara, KONDOH Michio

    生物物理(Web)　60　(Supplement 1-2)　2020

    ISSN： 1347-4219

  16. Modeling the distribution of river fish using environmental DNA data

    遠藤智也, 成田勝, 香川裕之, 長田穣, 近藤倫生

    日本生態学会大会講演要旨(Web)　67th　2020

  17. Identifying the fish species that respond to nuclear power plant thermal discharge in Uchiura Bay: a nonlinear time series analysis approach

    小杉奏太, 益田玲爾, 長田穣, 川津一隆, 近藤倫生

    日本生態学会大会講演要旨(Web)　67th　2020

  18. temporal consistency in the phytoplankton dynamics: the effect of taxonomic levels

    石川佳穂, 池田将平, 一瀬諭, 長田穣, 川津一隆, 京極大助, 古田世子, 近藤倫生

    日本生態学会大会講演要旨(Web)　67th　2020

  19. Anomaly detection of the fish community near Takahama nuclear power plant: an analysis of long term monitoring data

    大友優里, 益田玲爾, 長田穣, 川津一隆, 近藤倫生

    日本生態学会大会講演要旨(Web)　67th　2020

  20. Time series analysis for Microbial Interaction

    東豊浩, 加藤広海, 長田穣, 近藤倫生

    日本生態学会大会講演要旨(Web)　67th　2020

  21. Do you want to use time series data of a large number of ”model experimental ecosystems” like this, if it is open?

    細田一史, 村上なおみ, 瀬尾茂人, 長田穣, 松田秀雄, 近藤倫生

    個体群生態学会大会プログラム・講演要旨集(Web)　36th　2020

  22. Nonlinear time-series analysis of structural instability against changing environments in a marine fish community

    大友優里, 益田玲爾, 長田穣, 川津一隆, 近藤倫生

    個体群生態学会大会プログラム・講演要旨集(Web)　36th　2020

  23. Modeling the distribution of river fish using environmental DNA metabarcoding data

    遠藤智也, 香川裕之, 成田勝, 長田穣, 近藤倫生

    個体群生態学会大会プログラム・講演要旨集(Web)　36th　2020

  24. Toward understanding constraints in evolution and ecosystem changes using model synthetic ecosystems

    細田一史, 村上なおみ, 瀬尾茂人, 長田穣, 松田秀雄, 近藤倫生, 古澤力, 古澤力

    日本進化学会大会プログラム・講演要旨集(Web)　22nd　2020

  25. 琵琶湖におけるプランクトン動態を予測する

    石川佳穂, 池田将平, 一瀬諭, 長田穣, 川津一隆, 京極大助, 古田世子, 近藤倫生

    日本生態学会大会講演要旨(Web)　66th　2019

  26. キーストーン種は時間変化するか?:琵琶湖の植物プランクトン群集を例に

    赤石亮将, 池田将平, 一瀬諭, 長田穣, 川津一隆, 京極大助, 古田世子, 近藤倫生

    日本生態学会大会講演要旨(Web)　66th　2019

  27. 植物プランクトンの変動メカニズムは時間変化するか:分類階級間の比較

    石川佳穂, 池田将平, 一瀬諭, 長田穣, 川津一隆, 京極大助, 古田世子, 近藤倫生

    日本陸水学会大会講演要旨集　84th　2019

  28. 生態学は生物群集デザインに活用できるか?

    近藤倫生, 東豊浩, 加藤広海, 川津一隆, 長田穣, 永田裕二

    日本生物工学会大会講演要旨集　71st　2019

  29. 沿岸部の局所温暖化に伴う魚類群集動態の変化

    大友優里, 益田玲爾, 長田穣, 近藤倫生

    個体群生態学会大会プログラム・講演要旨集(Web)　35th　2019

  30. 相互作用の非線形性と群集動態の安定性:変動する自然生態系における検証

    川津一隆, 長田穣, 石井弓美子, 益田玲爾, 嶋田正和, 近藤倫生

    個体群生態学会大会プログラム・講演要旨集(Web)　35th　2019

  31. 環境DNA分析による個体数の推定

    深谷肇一, 村上弘章, 尹錫鎭, 南憲吏, 長田穣, 山本哲史, 益田玲爾, 笠井亮秀, 宮下和志, 源利文, 近藤倫生

    日本進化学会大会プログラム・講演要旨集(Web)　21st　2019

  32. The potential of environmental DNA for the estimation of population abundance and biomass Invited

    FUKAYA Keiichi, OSADA Yutaka, MINAMOTO TOSHIFUMI

    Aquabiology　40　(1)　47-53　2018/02

  33. 群集生態学の限界とデータ駆動型アプローチによる解決

    近藤倫生, 川津一隆, 長田穣, 京極大助, 潮雅之

    日本生態学会大会講演要旨(Web)　65th　2018

  34. 生物の共存に果たす密度依存の重要性:非線形時系列解析を用いた動的群集での検証

    川津一隆, 長田穣, 石井弓美子, 近藤倫生

    日本生態学会大会講演要旨(Web)　64th　2017

  35. Bayesian Isotope Mixing Model for Quantification of Food-web Structure

    64　(1)　77-92　2016/06

    Publisher: 情報・システム研究機構統計数理研究所

    ISSN： 0912-6112

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Research Projects 11

  1. Understanding the Impact of Accelerated Ocean Warming on Marine Microbial Ecosystems

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Japan Agency for Marine-Earth Science and Technology

    2025/04/01 - 2029/03/31

  2. Analysis of biodiversity indices using dimension reduction.

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2025/04/01 - 2028/03/31

  3. アイソスケープを用いた外洋性高次捕食者の回遊経路追跡手法の開発

    松林 順, 吉川 知里, 長田 穣

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    2021/04/01 - 2025/03/31

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    同位体分析に基づく高度回遊性魚類の回遊経路推定手法を確立するため、西部太平洋の広範囲からカツオの炭素・窒素安定同位体比データを収集した。これまでの研究で当該海域の広範囲から様々な体サイズのカツオの同位体データを入手できていたが、南西諸島周辺海域および北緯5度以南の熱帯海域では、サンプル数が不足していた。このため、今年度はこれらの海域を対象として調査船を用いた採捕調査を実施し、それぞれの海域内の複数地点からカツオ稚魚のサンプルを入手した。これらの稚魚サンプルの炭素・窒素安定同位体比を測定し、これまでに入手したデータと合わせて、カツオの炭素・窒素安定同位体比を各個体の体長および捕獲地点・捕獲時点における生物地球化学データを用いて予測する地理統計モデルを構築した。解析の結果、カツオの炭素・窒素安定同位体比のばらつきを高精度で予測するモデルを構築することに成功した。得られたモデルの係数を西部太平洋の広範囲における生物地球化学データに代入することで、当該海域における炭素・窒素安定同位体比の時空間分布の予測地図（アイソスケープ）を構築した。昨年度までは、カツオの炭素・窒素安定同位体比から熱帯・亜熱帯・北太平洋の3海域のどこで栄養を摂取したかを判別するモデルにとどまっていたが、今年度新たに作成したアイソスケープを用いることで、カツオの回遊履歴を緯度経度1度以上の高解像度で予測できる可能性がある。さらに、本モデルでは体長の増加（栄養段階の上昇）に伴う同位体比の変化もモデル化できていることから、バルクの同位体分析のみでも成長による同位体比の変化をキャンセルしたうえで回遊経路を推定することが可能となった。

  4. アイソスケープを用いた外洋性高次捕食者の回遊経路追跡手法の開発

    松林 順, 吉川 知里, 長田 穣

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(B)

    Category: 基盤研究(B)

    Institution: 国立研究開発法人水産研究・教育機構

    2021/04/01 - 2025/03/31

  5. Developing an analytical method of multi-elemental Isoscapes by international networks

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

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

    Institution: Research Institute for Humanity and Nature

    2020/10/27 - 2025/03/31

  6. Development of migration history ecology using multi-isoscapes and analysis of tissues having an individual history

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Research Institute for Humanity and Nature

    2021/04/05 - 2024/03/31

  7. Regime shifts in coastal marine ecosystems: an empirical approach based on advanced monitoring and nonlinear dynamical theory

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

    Category: Grant-in-Aid for Scientific Research (S)

    Institution: Tohoku University

    2019/06/26 - 2024/03/31

  8. Revealing diversity effects on ecosystem functioning

    Yutaka Osada

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Fisheries Research and Education Agency

    2021/04 - 2024/03

  9. Theoretical predictions of diversity and ecosystem functioning in complex ecological communities

    Yutaka Osada

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

    Category: Grant-in-Aid for Early-Career Scientists

    2018/04 - 2021/03

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    In this study, we proposed an approximation method to derive the ecosystem functions from differential equations of multi-species systems using network theory, and analytically predicted the biodiversity (number of species, connectance, interaction strength and interaction types) and ecosystem functioning (mean and variance) relationships for random communities. Our theoretical predictions were confirmed by numerical simulations consisting of 10-50 species.

  10. Development of optimal management strategies to control mammal populations using spatially explicit models

    Yokomizo Hiroyuki, MIYASHITA Tadashi, SUZUKI Maki, ASADA Masahiko, KURIYAMA Takeo, OSADA Yutaka

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: National Institute for Environmental Studies

    2013/04/01 - 2016/03/31

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    Overpopulated mammal populations cause damages to ecosystems and agricultural crops in Japan. We need to develop effective management plans under limited hunting resources. When we determine management plans, we have to deal with various uncertainties such as population size, growth rate, dispersal probability and hunting efficiency due to lack of data. We developed statistical models to estimate population sizes, growth rates, and agricultural damage from spatially-sparse survey data. We also developed a spatially explicit models incorporating anisotropic movement in heterogeneous landscape for the management of deer. We derived optimal allocation of hunting efforts to each management unit under uncertainties to minimize agricultural damage caused by deer, wild boars, and raccoons in Chiba prefecture, Japan.

  11. Predict range expansion of wildlife in heterogeneous landscape

    Yutaka Osada

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows

    Category: Grant-in-Aid for JSPS Fellows

    Institution: The University of Tokyo

    2012 - 2013

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Teaching Experience 6

  1. 統計生態学　東京大学

  2. 統計生態学　東京大学

  3. 生物学特選科目I　東北大学

  4. 生物学特選科目I　東北大学

  5. Ecological Statistics　The University of Tokyo

  6. Ecological Statistics　The University of Tokyo

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