What is the relationship between hypoxia, water chemistry, and otolith manganese content?
What is the relationship between hypoxia, water chemistry, and otolith manganese content?
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缺氧、水化学和耳石锰含量之间有什么关系？
DOI：
10.1111/jfb.15041
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发表时间：
2022
影响因子：
2
通讯作者：
Satoshi Katayama
中科院分区：
文献类型：
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作者：
Shengjian Jiang;Peiqi Hong;Satoshi Katayama
先前的研究表明，暴露于缺氧水团会导致耳石锰含量增加。导致耳石锰增加的机制尚不清楚，但可能是由于缺氧下水体中残留了大量的可用锰。因此，本研究旨在通过从东京湾捕获并在实验室中在不同水锰下饲养的大理石鲽鱼（Pseudopleuronectes yokohamae，Günther）来研究缺氧、水锰和耳石锰之间的关系。来自海湾的耳石显示出比外部更高的（Mn/Ca）耳石，以及高（Mn/Ca）耳石的季节性趋势，即半透明区域（在夏季形成）的开始，支持东京湾夏季缺氧的发生。尽管如此，在控制（Mn 0.50μmol l−1）、中浓度（Mn 6.94μmol l−1）和高浓度（Mn 10.4μmol l−1）处理下饲养的幼鱼表现出（Mn/Ca）耳石不成比例的较小增加。将室内实验与现场数据进行比较，东京湾缺氧条件下的(Mn/Ca)水可以达到与对照处理相似的低水平，但海湾的(Mn/Ca)耳石表现出比高处理更高的值。这些结果揭示了缺氧时耳石的 (Mn/Ca) 升高，但也表明耳石 Mn 可能无法直接记录水 Mn 的变化。
Previous studies have shown an increase in otolith Mn caused by exposure to hypoxic water masses. The mechanism leading to the increases in otolith Mn is still unclear, but might possibly be due to the larger amount of available Mn left in the water column under hypoxia. Thus, this study aimed to examine the relationship between hypoxia, water Mn and otolith Mn through marbled flounder (Pseudopleuronectes yokohamae, Günther) captured from Tokyo Bay and reared under different water Mn at laboratory. Otoliths from the Bay showed a higher (Mn/Ca)otoliththan outside, together with a seasonal trend of high (Mn/Ca)otolithat the start of translucent zones (which form in the summer), supporting the occurrence of summer hypoxia in Tokyo Bay. Nonetheless, juveniles reared under control (Mn 0.50 μmol l−1), middle (Mn 6.94 μmol l−1) and high (Mn 10.4 μmol l−1) treatments of water Mn concentrations showed a disproportional smaller increase in (Mn/Ca)otolith. Comparing the laboratory experiment with the field data, (Mn/Ca)waterunder hypoxia in Tokyo Bay could reach a low level similar to control treatment, yet (Mn/Ca)otolithof the Bay showed a higher value than the high treatment. These results revealed an elevated (Mn/Ca)otolithtowards hypoxia, but also suggested that changes in water Mn might not be directly recorded by otolith Mn.