Articles | Volume 23, issue 15
https://doi.org/10.5194/bg-23-5419-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-5419-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Diatom community assemblages and microbial degradation resistance modulate local heterogeneity in diatom contribution to carbon export in the western North Pacific Subtropical Gyre
Feng Li
School of Life Sciences, Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen Key Laboratory of Plant Genetics, Xiamen University, Xiamen 361102, Fujian, China
Hongzhen Jiang
School of Life Sciences, Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen Key Laboratory of Plant Genetics, Xiamen University, Xiamen 361102, Fujian, China
Linwei Liu
School of Life Sciences, Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen Key Laboratory of Plant Genetics, Xiamen University, Xiamen 361102, Fujian, China
Zhouyi Jiang
School of Life Sciences, Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen Key Laboratory of Plant Genetics, Xiamen University, Xiamen 361102, Fujian, China
Lu Huang
School of Life Sciences, Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen Key Laboratory of Plant Genetics, Xiamen University, Xiamen 361102, Fujian, China
Kehui Feng
School of Life Sciences, Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen Key Laboratory of Plant Genetics, Xiamen University, Xiamen 361102, Fujian, China
Zuozhu Wen
State Key Laboratory of Marine Environment Science, Xiamen University, Xiamen 361102, Fujian, China
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, Fujian, China
Xin Liu
State Key Laboratory of Marine Environment Science, Xiamen University, Xiamen 361102, Fujian, China
College of the Environment & Ecology, Xiamen University, Xiamen 36102, Fujian, China
Changping Chen
School of Life Sciences, Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen Key Laboratory of Plant Genetics, Xiamen University, Xiamen 361102, Fujian, China
Kuanbo Zhou
CORRESPONDING AUTHOR
State Key Laboratory of Marine Environment Science, Xiamen University, Xiamen 361102, Fujian, China
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, Fujian, China
School of Life Sciences, Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen Key Laboratory of Plant Genetics, Xiamen University, Xiamen 361102, Fujian, China
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Zuozhu Wen, Ruotong Jiang, Tianli He, Thomas Browning, Haizheng Hong, and Dalin Shi
EGUsphere, https://doi.org/10.5194/egusphere-2024-775, https://doi.org/10.5194/egusphere-2024-775, 2024
Preprint withdrawn
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The isotope effect of biological N2 fixation is a key parameter for understanding the nitrogen cycle, however, little is known about its regulatory mechanisms. Here we show for the first time that CO2 exerts important controls on the N isotopic composition in diazotrophic cyanobacteria Trichodesmium and Crocosphaera, through the controls on nitrogenase enzyme efficiency. This study provides insights into understanding the fluctuations of δ15N records, and thus the past nitrogen cycle.
Zhibo Shao, Yangchun Xu, Hua Wang, Weicheng Luo, Lice Wang, Yuhong Huang, Nona Sheila R. Agawin, Ayaz Ahmed, Mar Benavides, Mikkel Bentzon-Tilia, Ilana Berman-Frank, Hugo Berthelot, Isabelle C. Biegala, Mariana B. Bif, Antonio Bode, Sophie Bonnet, Deborah A. Bronk, Mark V. Brown, Lisa Campbell, Douglas G. Capone, Edward J. Carpenter, Nicolas Cassar, Bonnie X. Chang, Dreux Chappell, Yuh-ling Lee Chen, Matthew J. Church, Francisco M. Cornejo-Castillo, Amália Maria Sacilotto Detoni, Scott C. Doney, Cecile Dupouy, Marta Estrada, Camila Fernandez, Bieito Fernández-Castro, Debany Fonseca-Batista, Rachel A. Foster, Ken Furuya, Nicole Garcia, Kanji Goto, Jesús Gago, Mary R. Gradoville, M. Robert Hamersley, Britt A. Henke, Cora Hörstmann, Amal Jayakumar, Zhibing Jiang, Shuh-Ji Kao, David M. Karl, Leila R. Kittu, Angela N. Knapp, Sanjeev Kumar, Julie LaRoche, Hongbin Liu, Jiaxing Liu, Caroline Lory, Carolin R. Löscher, Emilio Marañón, Lauren F. Messer, Matthew M. Mills, Wiebke Mohr, Pia H. Moisander, Claire Mahaffey, Robert Moore, Beatriz Mouriño-Carballido, Margaret R. Mulholland, Shin-ichiro Nakaoka, Joseph A. Needoba, Eric J. Raes, Eyal Rahav, Teodoro Ramírez-Cárdenas, Christian Furbo Reeder, Lasse Riemann, Virginie Riou, Julie C. Robidart, Vedula V. S. S. Sarma, Takuya Sato, Himanshu Saxena, Corday Selden, Justin R. Seymour, Dalin Shi, Takuhei Shiozaki, Arvind Singh, Rachel E. Sipler, Jun Sun, Koji Suzuki, Kazutaka Takahashi, Yehui Tan, Weiyi Tang, Jean-Éric Tremblay, Kendra Turk-Kubo, Zuozhu Wen, Angelicque E. White, Samuel T. Wilson, Takashi Yoshida, Jonathan P. Zehr, Run Zhang, Yao Zhang, and Ya-Wei Luo
Earth Syst. Sci. Data, 15, 3673–3709, https://doi.org/10.5194/essd-15-3673-2023, https://doi.org/10.5194/essd-15-3673-2023, 2023
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N2 fixation by marine diazotrophs is an important bioavailable N source to the global ocean. This updated global oceanic diazotroph database increases the number of in situ measurements of N2 fixation rates, diazotrophic cell abundances, and nifH gene copy abundances by 184 %, 86 %, and 809 %, respectively. Using the updated database, the global marine N2 fixation rate is estimated at 223 ± 30 Tg N yr−1, which triplicates that using the original database.
Yifan Ma, Kuanbo Zhou, Weifang Chen, Junhui Chen, Jin-Yu Terence Yang, and Minhan Dai
Biogeosciences, 20, 2013–2030, https://doi.org/10.5194/bg-20-2013-2023, https://doi.org/10.5194/bg-20-2013-2023, 2023
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We distinguished particulate organic carbon (POC) export fluxes out of the nutrient-depleted layer (NDL) and the euphotic zone. The amount of POC export flux at the NDL base suggests that the NDL could be a hotspot of particle export. The substantial POC export flux at the NDL base challenges traditional concepts that the NDL was limited in terms of POC export. The dominant nutrient source for POC export fluxes should be subsurface nutrients, which was determined by 15N isotopic mass balance.
Zuozhu Wen, Thomas J. Browning, Rongbo Dai, Wenwei Wu, Weiying Li, Xiaohua Hu, Wenfang Lin, Lifang Wang, Xin Liu, Zhimian Cao, Haizheng Hong, and Dalin Shi
Biogeosciences, 19, 5237–5250, https://doi.org/10.5194/bg-19-5237-2022, https://doi.org/10.5194/bg-19-5237-2022, 2022
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Fe and P are key factors controlling the biogeography and activity of marine N2-fixing microorganisms. We found lower abundance and activity of N2 fixers in the northern South China Sea than around the western boundary of the North Pacific, and N2 fixation rates switched from Fe–P co-limitation to P limitation. We hypothesize the Fe supply rates and Fe utilization strategies of each N2 fixer are important in regulating spatial variability in community structure across the study area.
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Short summary
In nutrient‑poor open ocean, scarce diatoms still remove CO₂. In the western North Pacific Subtropical Gyre (NPSG), we found different diatoms live at different depths. Where a warm current (Kuroshio) flows, large diatoms carry more carbon to deep water; elsewhere their contribution is lower. Microbes lack genes to digest protective polymers made by diatoms, which may help carbon sink efficiently. To predict ocean climate role, we must know not only which algae are present but also how well their organic matter resists decay.
In nutrient‑poor open ocean, scarce diatoms still remove CO₂. In the western North Pacific...
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