Diazotrophy in the Indian Ocean: Current understanding and future perspectives

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2023-09-01 DOI:10.1002/lol2.10343
Subhadeep Chowdhury, Eric Raes, Cora Hörstmann, Ayaz Ahmed, Céline Ridame, Nicolas Metzl, P S Bhavya, Takuya Sato, Takuhei Shiozaki, Sophie Bonnet, Carolin R. Löscher, Arvind Singh, Mar Benavides
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Abstract

Dinitrogen (N2) fixation provides the major source of reactive nitrogen in the open ocean, sustaining biological productivity. The Indian Ocean (IO) covers 22% of the ocean surface, while it only represents 1% of the global diazotroph database. Hence, constraining the sources of nitrogen in the IO is crucial. Here, we compile three decades of N2 fixation and diazotroph DNA data in the IO. Our analysis reveals basin-scale yearly rates between ~ 7 and 13 Tg N yr−1. These rates are in the range of previous modeling-based estimates but may represent a lower bound estimate due to the lack of data in this basin. Diazotroph variability among sub-basins may suggest endemicity but needs to be taken with caution due to biased sampling toward certain seasons and uneven spatial coverage. We provide recommendations for a more accurate representation of the IO in the global nitrogen budget and our knowledge of diazotroph biogeography.

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印度洋重氮化:目前的认识和未来的展望
二氮(N2)固定是公海中活性氮的主要来源,维持了生物生产力。印度洋(IO)覆盖了22%的海洋表面,而它只占全球重氮菌数据库的1%。因此,限制IO中的氮源至关重要。在这里,我们汇编了IO中三十年的N2固定和重氮菌DNA数据。我们的分析显示~ 7和13 Tg N yr−1。这些速率在以前基于建模的估计范围内,但由于该盆地缺乏数据,可能代表下限估计。子流域间的滞育性变异可能表明存在地方性,但由于对某些季节的采样有偏差和空间覆盖不均,需要谨慎对待。我们为更准确地表示全球氮预算中的IO以及我们对重氮生物地理学的了解提供了建议。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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