Oxygen decline poses increasing risks to global shelf communities. This study was conducted to measure species oxygen exposures in situ and to assess risks of low oxygen based on the hypothesis that species risk varies spatially and is dependent on the interaction of shelf oxygen dynamics with habitat pattern, species mobility, and tolerance to low oxygen. Here, we report concomitant observations of oxygen, depth, and habitat for the most common benthic and epibenthic megafauna on the southern California shelf (30–125 m). The study was conducted when oxygen concentrations were the lowest observed within the previous 30 years off southern California (2012–2014), yet hypoxic conditions (<1.42 ml l⁻¹) were not observed. No significant oxygen exposure differences were observed among highly mobile, mobile, and sessile species due to the dynamic nature of the oxycline. Habitat affinities for the most abundant benthic megafauna (53 taxa) were discriminated among four different habitats. Highly mobile rockfish (Sebastidae) exhibited distributions suggesting less tolerance to low oxygen than most other taxa. Given the mosaic of consolidated and coarse-grained habitats that rockfish prefer, the onset of hypoxic conditions near the shelf break (∼90–120 m) would likely compress local rockfish populations into less favourable habitat in a non-linear fashion.

中文翻译：

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根据原位观察，物种迁移和海景，对南加利福尼亚大陆架大型动物的氧气风险和耐受性进行测量

氧气减少对全球货架社区构成了越来越大的风险。这项研究是根据物种风险在空间上变化并且取决于架子上的氧气动力学与生境模式，物种迁移性以及对低氧耐受性的相互作用这一假设进行的，以就地测量物种的氧气暴露并评估低氧风险。在这里，我们报告了在加利福尼亚南部大陆架（30-125 m）上最常见的底栖和上底栖大型动物的氧气，深度和栖息地的观测结果。进行该研究时，氧浓度是南加州（2012-2014年）之前30年来最低的氧浓度，但缺氧条件（<1.42 ml l ^-1）没有被观察到。由于土霉素的动态特性，在高流动性，流动性和无梗物种之间未观察到明显的氧暴露差异。在四个不同的生境中，对最丰富的底栖大型动物（53类群）的生境亲和力进行了区分。流动性较高的石鱼（Sebastidae）的分布表明，其对低氧的耐受性低于大多数其他类群。考虑到石鱼偏爱的固结和粗粒生境的镶嵌图，在架子断裂（约90–120 m）附近出现的低氧条件可能会以非线性方式将当地石鱼种群压缩为不利的生境。