Impacts of algal blooms on sinking carbon flux and hypoxia off the Changjiang River estuary

Zhao LI; Yingxin ZHANG; Shuqun SONG; Caiwen LI

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Impacts of algal blooms on sinking carbon flux and hypoxia off the Changjiang River estuary

Ecology | Updated：2024-10-12

- Impacts of algal blooms on sinking carbon flux and hypoxia off the Changjiang River estuary
- Journal of Oceanology and Limnology Vol. 41, Issue 6, Pages: 2180-2196(2023)
- Affiliations：
  
  1.School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China
  2.CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  3.Marine Ecology and Environmental Science Laboratory, Laoshan Laboratory, Qingdao 266237, China
  4.University of Chinese Academy of Sciences, Beijing 100049, China
  5.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
- Author bio：
  
  songshuqun@qdio.ac.cn
- Funds：
- DOI：
  CLC：
- Received：14 July 2022，
  
  Accepted：15 September 2022，
  
  Online First：13 October 2022，
  
  Published：01 November 2023
- Accepted：
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LI Zhao,ZHANG Yingxin,SONG Shuqun,et al.Impacts of algal blooms on sinking carbon flux and hypoxia off the Changjiang River estuary[J].Journal of Oceanology and Limnology,2023,41(06):2180-2196.
DOI：

LI Zhao,ZHANG Yingxin,SONG Shuqun,et al.Impacts of algal blooms on sinking carbon flux and hypoxia off the Changjiang River estuary[J].Journal of Oceanology and Limnology,2023,41(06):2180-2196. DOI：

摘要

Abstract

Based on 10 multidisciplinary investigations conducted from February 2015 to January 2016

the phytoplankton community and its association with ambient seawater physicochemical parameters in the Changjiang (Yangtze) River estuary (CE) and its adjacent waters were comprehensively examined. In total

265 taxa were identified

belonging to 5 phyla and 94 genera. Diatoms (63.78%) and dinoflagellates (33.21%) were the dominant groups. The variation of diatom abundance showed a positive relationship with the nutrient concentrations while the dinoflagellate abundance showed a negative relationship. Two algal bloom events occurred during the investigation period. The Changjiang Diluted Water (CDW) induced environmental gradients in the upper layer

favoring the diatom bloom in July. The invasion of the nearshore Kuroshio branch current could affect the formation of a bloom of

Prorocentrum

donghaiense

. With the blooming and senescence of phytoplankton

low dissolved oxygen (DO) and hypoxia occurred in the bottom waters. The bottom DO concentration displayed a significantly negative correlation with phytoplankton carbon flux. The present study provi

des straightforward evidence for the source of organic matter for oxygen consumption in the CE and its adjacent waters.

关键词

Keywords

references

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