The relationship of macrobenthic functional group composition and hypoxia in the Changjiang River estuary and its adjacent areas

Authors

  • Liuzhen He Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, P. R. China
  • Lu Shou Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, P. R. China
  • Yibo Liao Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, P. R. China
  • Yanbin Tang Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, P. R. China
  • Quanzhen Chen Second Institute of Oceanography, Ministry of Natural Resources, No.36, Baochu North Road, Hangzhou 310012, P. R. China
  • Jianfang Chen Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, P. R. China
  • Aigen Gao Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, P. R. China

Keywords:

macrobenthos, environmental factors

Abstract

This study investigates the relationship between macrobenthic functional group composition and hypoxia in the Changjiang River estuary and its adjacent sea areas. A total of 82 stations were divided into three areas, named non-hypoxic area, hypoxic area and the Changjiang River, respectively. A total of 256 macrobenthic species were collected, which were divided into five functional groups, including carnivorous, detritivorous, omnivorous, phytophagous, and the planktivorous functional group. A similarity analysis performed on the macrobenthic functional groups of the three zones indicates that the functional group distributions of non-hypoxic and hypoxic zones are not significantly different, whereas the functional group compositions of the Changjiang River estuary and the other two zones are rather different. The results of canonical correspondence analysis reveal that the distribution of macrobenthic functional groups is compounded by various environmental factors, of which dissolved inorganic nitrogen, salinity, and temperature exert a significant effect. Combining the results of previous studies, we speculate that macrobenthos are able to adapt to the occurrence of hypoxia by changing their body morphology, distribution location, and community structure. When the environmental conditions prevent the hypoxia from occurring, persisitent hypoxic zones can recover their marine microbenthic community.

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Published

2020-07-02

Issue

Vol. 23 No. 3 (2020): Aquatic Ecosystem Health & Management

Section

Research article

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