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首页> 外文期刊>Estuarine Coastal and Shelf Science >Effects of phytoplankton vertical migration on the formation of oxygen depleted water in a shallow coastal sea
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Effects of phytoplankton vertical migration on the formation of oxygen depleted water in a shallow coastal sea

机译：浅海近海浮游植物垂直迁移对贫氧水形成的影响

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In this paper, oxygen budget was estimated for the lower layer of water column in a semi-enclosed bay, Ago Bay, Japan. Benthic oxygen consumption rates were measured directly with an in situ measurement device from 13 July to 16 August 2004. Oxygen budget was calculated based on physical, chemical and biological processes using the observed data. Along with the change of the water column structure at the time of a hit of typhoon, dominant phytoplankton species shifted from the diatom Skeletonema costatum to the dinoflagellate Heterocapsa circularisquama. During the diatom-dominating period, oxygen supply rate in the lower layer due to photosynthesis was comparable to or slightly lower than the sediment oxygen consumption rate. In contrast, during the dominance of the dinoflagellate, net oxygen budget was significantly negative in the lower layer while it was positive in the upper layer. This could be attributed to the migration behavior of the dominant dinoflagellate H. circularisquama that swim up to the upper layer and produce oxygen in daytime, and swim down to the lower layer and consume oxygen in nighttime. The results of the present study suggest that phytoplankton migration behavior can enhance the development of oxygen depleted water mass in the lower layer of eutrophic shallow coastal seas.
机译：在本文中，估算了日本阿哥湾半封闭海湾水柱下层的氧气预算。从2004年7月13日至8月16日，直接使用现场测量设备测量底栖氧气消耗率。使用观察到的数据根据​​物理，化学和生物过程计算氧气预算。随着台风袭击时水柱结构的变化，主要的浮游植物种类也从硅藻Skeletonema costatum转移到了硅藻鞭毛异鳞藻。在硅藻占主导的时期，由于光合作用而在下层中的供氧率与沉积物的耗氧率相当或略低。相反，在鞭毛藻占优势时，下层的净氧收支显着为负，而上层的净氧收支为正。这可能归因于占优势的鞭毛鞭毛圆形鳞茎的游走行为，游走至上层并在白天产生氧气，然后游至下层并在夜间消耗氧气。本研究的结果表明，浮游植物的迁移行为可以促进富营养化浅海沿岸低层缺氧水团的发展。

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