1. Global oceanic diazotroph database version 2 and elevated estimate of global oceanic N2 fixation
- Author
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Shao, Zhibo, Xu, Yangchun, Wang, Hua, Luo, Weicheng, Wang, Lice, Huang, Yuhong, Agawin, Nona Sheila R, Ahmed, Ayaz, Benavides, Mar, Bentzon-Tilia, Mikkel, Berman-Frank, Ilana, Berthelot, Hugo, Biegala, Isabelle C, Bif, Mariana B, Bode, Antonio, Bonnet, Sophie, Bronk, Deborah A, Brown, Mark V, Campbell, Lisa, Capone, Douglas G, Carpenter, Edward J, Cassar, Nicolas, Chang, Bonnie X, Chappell, Dreux, Chen, Yuh-ling Lee, Church, Matthew J, Cornejo-Castillo, Francisco M, Detoni, Amália Maria Sacilotto, Doney, Scott C, Dupouy, Cecile, Estrada, Marta, Fernandez, Camila, Fernández-Castro, Bieito, Fonseca-Batista, Debany, Foster, Rachel A, Furuya, Ken, Garcia, Nicole, Goto, Kanji, Gago, Jesús, Gradoville, Mary R, Hamersley, M Robert, Henke, Britt A, Hörstmann, Cora, Jayakumar, Amal, Jiang, Zhibing, Kao, Shuh-Ji, Karl, David M, Kittu, Leila R, Knapp, Angela N, Kumar, Sanjeev, LaRoche, Julie, Liu, Hongbin, Liu, Jiaxing, Lory, Caroline, Löscher, Carolin R, Marañón, Emilio, Messer, Lauren F, Mills, Matthew M, Mohr, Wiebke, Moisander, Pia H, Mahaffey, Claire, Moore, Robert, Mouriño-Carballido, Beatriz, Mulholland, Margaret R, Nakaoka, Shin-ichiro, Needoba, Joseph A, Raes, Eric J, Rahav, Eyal, Ramírez-Cárdenas, Teodoro, Reeder, Christian Furbo, Riemann, Lasse, Riou, Virginie, Robidart, Julie C, Sarma, Vedula VSS, Sato, Takuya, Saxena, Himanshu, Selden, Corday, Seymour, Justin R, Shi, Dalin, Shiozaki, Takuhei, Singh, Arvind, Sipler, Rachel E, Sun, Jun, Suzuki, Koji, Takahashi, Kazutaka, Tan, Yehui, Tang, Weiyi, Tremblay, Jean-Éric, Turk-Kubo, Kendra, Wen, Zuozhu, White, Angelicque E, Wilson, Samuel T, Yoshida, Takashi, Zehr, Jonathan P, Zhang, Run, Zhang, Yao, and Luo, Ya-Wei
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Life Below Water ,Atmospheric Sciences ,Geochemistry ,Physical Geography and Environmental Geoscience - Abstract
Abstract. Marine diazotrophs convert dinitrogen (N2) gas intobioavailable nitrogen (N), supporting life in the global ocean. In 2012, thefirst version of the global oceanic diazotroph database (version 1) waspublished. Here, we present an updated version of the database (version 2),significantly increasing the number of in situ diazotrophic measurements from13 565 to 55 286. Data points for N2 fixation rates, diazotrophic cellabundance, and nifH gene copy abundance have increased by 184 %, 86 %, and809 %, respectively. Version 2 includes two new data sheets for the nifH genecopy abundance of non-cyanobacterial diazotrophs and cell-specific N2fixation rates. The measurements of N2 fixation rates approximatelyfollow a log-normal distribution in both version 1 and version 2. However,version 2 considerably extends both the left and right tails of thedistribution. Consequently, when estimating global oceanic N2 fixationrates using the geometric means of different ocean basins, version 1 andversion 2 yield similar rates (43–57 versus 45–63 Tg N yr−1; rangesbased on one geometric standard error). In contrast, when using arithmeticmeans, version 2 suggests a significantly higher rate of 223±30 Tg N yr−1 (mean ± standard error; same hereafter) compared to version 1(74±7 Tg N yr−1). Specifically, substantial rate increases areestimated for the South Pacific Ocean (88±23 versus 20±2 Tg N yr−1), primarily driven by measurements in the southwestern subtropics,and for the North Atlantic Ocean (40±9 versus 10±2 Tg N yr−1). Moreover, version 2 estimates the N2 fixation rate in theIndian Ocean to be 35±14 Tg N yr−1, which could not be estimatedusing version 1 due to limited data availability. Furthermore, a comparisonof N2 fixation rates obtained through different measurement methods atthe same months, locations, and depths reveals that the conventional15N2 bubble method yields lower rates in 69 % cases compared tothe new 15N2 dissolution method. This updated version of thedatabase can facilitate future studies in marine ecology andbiogeochemistry. The database is stored at the Figshare repository(https://doi.org/10.6084/m9.figshare.21677687; Shao etal., 2022).
- Published
- 2023