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首页> 外文期刊>ICES Journal of Marine Science >Gauging oxygen risk and tolerance for the megafauna of the Southern California shelf based on in situ observation, species mobility, and seascape
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Gauging oxygen risk and tolerance for the megafauna of the Southern California shelf based on in situ observation, species mobility, and seascape

机译:基于原位观察,物种流动性和海景,衡量南加州架子湄面套的氧气风险和宽容

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摘要

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 (similar to 90-120m) would likely compress local rockfish populations into less favourable habitat in a non-linear fashion.
机译:氧气下降会带来对全球货架社区的风险越来越大。该研究是以原位测量物种氧气暴露,并根据物种风险在空间上变化的假设来评估低氧的风险,并取决于货架氧动力学与栖息地模式,物种迁移率和低氧耐受性的相互作用。在这里,我们报告伴随着南加州架子上最常见的底栖和表皮百搭的氧气,深度和栖息地的观察(30-125米)。当氧气浓度在南加州南部(2012-2014)(2012-2014)的前30岁内最低时进行了该研究,但未观察到缺氧条件(<1.42ml L(-1))。由于源素的动态性质,在高度移动,移动和无梗塞物种中没有观察到显着的氧暴露差异。四种不同的栖息地,歧视了最丰富的Benthic Megafauna(53个分类群)的栖息地亲和力。高度移动的铲子(Sebastidae)表现出分布,表明对低氧气的耐受性比大多数其他出株。鉴于石斑鱼更喜欢的巩固和粗粒栖息地的马赛克,搁置架子附近的缺氧条件(类似于90-120米)可能会以非线性方式压缩局部岩石种群进入更不利的栖息地。

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