Kajita Tadashi

写真a

Title

Professor

Researcher Number(JSPS Kakenhi)

80301117

Homepage URL

http://nesseiken.info

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Current Affiliation Organization 【 display / non-display 】

  • Concurrently   University of the Ryukyus   Graduate School of Agriculture   Professor  

  • Concurrently   University of the Ryukyus   The United Graduate School of Agricultural Sciences, Kagoshima University   Professor  

  • Duty   University of the Ryukyus   Tropical Biosphere Research Center   Professor  

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University 【 display / non-display 】

  • 　
    -
    1989

    Tohoku University   Faculty of Science   Graduated

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Graduate School 【 display / non-display 】

  • 　
    -
    1991.03

    Tohoku University  Graduate School, Division of Natural Science  Doctor's Course (first term)  Completed

  • 　
    -
    1994.03

    Tohoku University  Graduate School, Division of Natural Science  Doctor's Course (second term)  Completed

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External Career 【 display / non-display 】

  • 2015.05
    　
    　

    University of the Ryukyus, Tropical Biosphere Research Center, Professor  

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Research Interests 【 display / non-display 】

  • 分子系統学

  • 保全生物学

  • マングローブ

  • マメ科

  • Sea-dispersal

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Research Areas 【 display / non-display 】

  • Life Science / Biodiversity and systematics

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Published Papers 【 display / non-display 】

  • Evolutionary and ecological trends in the Neotropical cycad genus Dioon (Zamiaceae): An example of success of evolutionary stasis

    José Said Gutiérrez-Ortega, Miguel Angel Pérez-Farrera, Mitsuhiko P. Sato, Ayumi Matsuo, Yoshihisa Suyama, Andrew P. Vovides, Francisco Molina-Freaner, Tadashi Kajita, Yasuyuki Watano

    Ecological Research ( Wiley )    2024.02 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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  • The phylogenetic reconstruction of the Neotropical cycad genus Ceratozamia (Zamiaceae) reveals disparate patterns of niche evolution

    José Said Gutiérrez-Ortega, Miguel Angel Pérez-Farrera, Ayumi Matsuo, Mitsuhiko P. Sato, Yoshihisa Suyama, Michael Calonje, Andrew P. Vovides, Tadashi Kajita, Yasuyuki Watano

    Molecular Phylogenetics and Evolution ( Elsevier BV )    107960 - 107960   2023.11 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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  • Aboveground biomass and carbon stock estimation using UAV photogrammetry in Indonesian mangroves and other competing land uses

    Mohammad Basyuni, Anindya Wirasatriya, Sigit Bayhu Iryanthony, Rizka Amelia, Bejo Slamet, Nurdin Sulistiyono, Rudhi Pribadi, Elham Sumarga, Syaiful Eddy, Shofiyah S. Al Mustaniroh, Sigit D. Sasmito, Frida Sidik, Tadashi Kajita, Hayssam M. Ali, Paul A. Macklin, Virni B. Arifanti

    Ecological Informatics   77   2023.11 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    Mangrove ecosystem is one of coastal wetlands that have experienced significant anthropogenic driven degradation and conversion, which have resulted in substantial carbon releases to the atmosphere and the oceans. However, carbon stock assessments and monitoring for mangroves are mostly confined to in situ methodologies, which has limited further understanding of wider-scale spatial variations and additional driving factors of carbon loss. Here,we report a novel application using unmanned aerial vehicles (UAVs) to estimate and compare aboveground biomass (AGB) carbon stocks of mangrove forests with two alternate replacement commercial land uses (oil palm and coconut plantations) in Lubuk Kertang and Pulau Sembilan, North Sumatra, Indonesia. We generated high-accuracy digital surface models (DSMs) and digital terrain models (DTMs), as well as elevation data from a global navigation satellite system (GNSS). Through analysis, we highlight how mangrove forest conversion to oil palm and coconut plantations significantly decreases the aboveground biomass carbon (AGB) and carbon stocks (AGC) of selected mangrove ecosystems in Indonesia. In this study, spatially mapped biomass carbon measurements were found to be more accurate when cross-validated with in situ measurements. AGC stocks were found to be over 10- to 12-fold that of converted oil palm and coconut plantations across selected study sites. The generated biomass carbon stock product provides new knowledge of carbon stock distribution in Indonesia across mangrove forests and two alternative commercial land use types within similar topographical landscapes. This combined methodological approach may be a useful tool to assist with blue carbon inventories as well as for selecting specific mangrove conservation and restoration areas across larger spatial scales.

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  • Prospects and challenges of environmental DNA (eDNA) metabarcoding in mangrove restoration in Southeast Asia

    Alison K. S. Wee, Severino G. Salmo Iii, Kannan Sivakumar, Amy Y-H Then, Mohammad Basyuni, Jean Fall, Kazi Ahsan Habib, Yukinobu Isowa, Venus Leopardas, Nasreen Peer, Maria D. Artigas-Ramirez, Kithsiri Ranawana, Itchika Sivaipram, Monica Suleiman, Tadashi Kajita

    FRONTIERS IN MARINE SCIENCE ( FRONTIERS MEDIA SA )  10   2023.02 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    Species detection using environmental DNA (eDNA) is a biomonitoring tool that can be widely applied to mangrove restoration and management. Compared to traditional surveys that are taxa-specific and time-consuming, eDNA metabarcoding offers a rapid, non-invasive and cost-efficient method for monitoring mangrove biodiversity and characterising the spatio-temporal distribution of multiple taxa simultaneously. General guidelines for eDNA metabarcoding are well-established for aquatic systems, but habitat-specific guidelines are still lacking. Mangrove habitats, as priority ecosystems for restoration in Southeast Asia, present unique prospects and challenges in these regards. Environmental DNA metabarcoding can be used to (1) track functional recovery in ecological restoration, (2) prioritise conservation areas, (3) provide early warning for threats, (4) monitor threatened taxa, (5) monitor response to climate change, and (6) support community-based restoration. However, these potential applications have yet been realized in Southeast Asia due to (1) technical challenges, (2) lack of standardised methods, (3) spatio-temporal difficulties in defining community, (4) data limitations, and (5) lack of funding, infrastructure and technical capacity. Successful implementation of eDNA metabarcoding in mangrove restoration activities would encourage the development of data-driven coastal management and equitable conservation programs. Eventually, this would promote Southeast Asia's shared regional interests in food security, coastal defence and biodiversity conservation.

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  • Implementation of 16S rRNA Gene for Fish and Shrimp Barcoding in Mangrove Ecosystems in North Sumatra and Aceh, Indonesia

    Hatika Hairani, Rizka Amelia, Ipanna Enggar Susetya, Arida Susilowati, Yuntha Bimantara, Tadashi Kajita, Mohammad Basyuni

    Jurnal Ilmiah Perikanan dan Kelautan   15 ( 1 ) 152 - 161   2023.01 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    Fish and shrimp are among the species that are vulnerable to high level of disturbance in mangrove ecosystem. This study aimed to investigate the implementation of 16S rRNA gene for fish and shrimp barcoding in mangrove ecosystems in North Sumatra and Aceh, Indonesia. 50 samples fresh fish and shrimp were collected from five mangrove ecosystems in North Sumatra, namely Belawan, Lubuk Kertang, Percut Sei Tuan, and Pulau Sembilan and Langsa of Aceh for DNA extraction process. The research was divided into four activities: sample collection, DNA isolation, PCR amplification, and data analysis. DNA was extracted using kit extraction (kit Reliaprep gDNA Tissue Miniprep System) and with PCR amplification. Genetic parameters were analyzed using Gen Alex 6.51 software and the relationship between sites was examined using the MVSP 3.22. The genetic diversity of fish and shrimp from mangrove habitats was relatively substantial, according to the findings, with a heterozygosity of 0.926, with the exception of Langsa samples, which were only identified in subclass A1. Genetic relationship between sites revealed that all samples clustered into two branches and were randomly dispersed within each site. This work confirmed the 16S rRNA gene worked for fish and shrimp barcoding in mangrove ecosystems, North Sumatra and Aceh, Indonesia and our findings are expected to be useful in developing mangrove conservation and restoration initiatives.

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Other Papers 【 display / non-display 】

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Work 【 display / non-display 】

  • Field works for the study of patropic sea-current seed dispersal plants

    1997
    　
    　
     

  • Phylogegraphical study of pantropic sea-current seed dispersal plants

    1997
    　
    　
     

  • Molecular systematic study of Desmodieae(Leguminosae)

    1994
    　
    　
     

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