Deep oxygen-depleted Red Sea coral reef depressions sustain resistant ecosystems

Persistent oxygen-depleted zones in the ocean are known primarily from enclosed basins in temperate regions or the open-ocean (including oxygen minimum and limiting zones). However, little is known about the potential for such zones in tropical coastal domains, despite warmer temperatures and complex geomorphological structures in some tropical areas increasing the likelihood of their existence. Here, we report two subsurface oxygen-depleted zones within deep depressions of the Red Sea’s Difaht Farasan—a carbonate platform hosting the world’s third-largest contiguous tropical coral reef system. One zone maintains suboxic oxygen levels (~11-14 µmol kg⁻¹), while the other sustains oxygen levels below detection (&lt;2 µmol kg⁻¹). The suboxic zone shows no fixed nitrogen loss, while the near-anoxic zone hosts anaerobic microbial populations and shows signs of nitrogen loss. We propose that the warm and saline environment of the Red Sea interacts with the semi-enclosed depressions to restric..., , , # Data from: Deep oxygen-depleted Red Sea coral reef depressions sustain resistant ecosystems (Published in PNAS Nexus) **Authors:** Shannon G. Klein, Larissa Frühe, Anieka J. Parry, Fabio Marchese, Megan K. B. Nolan, Elisa Laiolo, Kah Kheng Lim, Alexandra Steckbauer, Jessica Breavington, Christopher A. Hempel, Kate von Krusenstiern, Froukje M. van der Zwan, Eleonora Re, Taiba Alamoudi, Jacqueline V. Alva Garcia, Silvia Arossa, Carlos A. Preckler, Mattie Rodrigue, Vincent A. Pieribone, Mohammad A. Qurban, Francesca Benzoni, and Carlos M. Duarte Correspondence: Shannon G. Klein; [[e-mail]](mailto:[e-mail]) The associated dryad repository contains ten files: ## Supplementary Data File 1 This file contains 5 columns and is the source data file for Figure 2(a-c) of the associated publication. Data represent the full depth profiles of dissolved oxygen, temperature, and salinity within two deep depressions of the Farasan Bank, Saudi Arabia (sites 1 a...海洋中持久的缺氧区（oxygen-depleted zones）最初主要被认知于温带区域的封闭盆地或开阔大洋（包括缺氧最小区与缺氧限制区）。然而，尽管部分热带区域水温更高、地貌结构复杂，提升了这类缺氧区形成的可能性，但学界对热带沿海区域存在这类缺氧区的潜力仍知之甚少。 本研究报道了红海迪法赫法拉桑（Difaht Farasan）——一处拥有全球第三大连片热带珊瑚礁系统的碳酸盐台地——的深层凹陷内存在两处次表层缺氧区。其中一处维持着低氧（suboxic）水平（约11~14 μmol kg⁻¹），另一处的氧含量则低于检测限（<2 μmol kg⁻¹）。该低氧区未表现出固氮损失现象，而近乎缺氧的（near-anoxic）区域则栖息着厌氧微生物种群，并显示出氮损失的迹象。我们提出，红海温暖且高盐的环境与半封闭凹陷相互作用，以限制…… # 数据来源：《红海珊瑚礁凹陷中的深层缺氧区维持抗性生态系统》（发表于PNAS Nexus） **作者**：Shannon G. Klein、Larissa Frühe、Anieka J. Parry、Fabio Marchese、Megan K. B. Nolan、Elisa Laiolo、Kah Kheng Lim、Alexandra Steckbauer、Jessica Breavington、Christopher A. Hempel、Kate von Krusenstiern、Froukje M. van der Zwan、Eleonora Re、Taiba Alamoudi、Jacqueline V. Alva Garcia、Silvia Arossa、Carlos A. Preckler、Mattie Rodrigue、Vincent A. Pieribone、Mohammad A. Qurban、Francesca Benzoni 及 Carlos M. Duarte 通讯作者：Shannon G. Klein；[[e-mail]](mailto:[e-mail]) 关联的Dryad仓储包含10个文件： ## 补充数据文件1 该文件包含5列数据，为关联论文中图2(a-c)的源数据文件。数据代表沙特阿拉伯法拉桑浅滩（Farasan Bank）两处深层凹陷（位点1a……）内溶解氧、温度及盐度的全深度剖面。