Assessment of the benthic ecological status in adjacent areas of the Yangtze River Estuary, China, using AMBI, M-AMBI and BOPA biotic indices

The main environmental variables of bottom seawater and macrobenthic invertebrates were investigated from February 2015 to January 2016 to evaluate the benthic ecological status in adjacent areas of the Yangtze River Estuary, China. Diverse ecological assessment results were given by the AZTI Marine...

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Bibliographic Details
Published in:Marine pollution bulletin 2020-04, Vol.153, p.111020-111020, Article 111020
Main Authors: Yan, Jia, Sui, Jixing, Xu, Yong, Li, Xinzheng, Wang, Hongfa, Zhang, Baolin
Format: Article
Language:English
Subjects:
Aquatic crustaceans
Benthic ecological status
Benthos
Biotic indices
Changjiang Diluted Water
Distribution patterns
Ecological effects
Environmental variables
Estuaries
Estuarine dynamics
Eutrophication
Invertebrates
Macrobenthic invertebrates
Marine environment
Rivers
Seasonal variation
Seasonal variations
Seawater
Spatial distribution
Yangtze River Estuary
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Summary:The main environmental variables of bottom seawater and macrobenthic invertebrates were investigated from February 2015 to January 2016 to evaluate the benthic ecological status in adjacent areas of the Yangtze River Estuary, China. Diverse ecological assessment results were given by the AZTI Marine Biotic Index (AMBI), multivariate-AMBI (M-AMBI) and benthic opportunistic polychaetes amphipods (BOPA) index, showing that the M-AMBI was the most suitable in the study area. A clear spatial distribution pattern related to the distance from the estuary and the coasts was found both for the benthic ecological status and the eutrophication-related bottom seawater environmental variables, indicating that the study area was under eutrophication pressure. Two major disturbed regions (one was east of the Yangtze River Estuary, and the other was east of Zhejiang Province) were discovered, which was probably mainly caused by the Changjiang Diluted Water (CDW). No significant seasonal changes were found in the ecological status. •The M-AMBI was more suitable than the AMBI and BOPA index in the study area.•The benthic environment in the study area was under eutrophication pressure.•Benthic ecological status was related to the distance from the estuary and coasts.•Two major disturbed regions were found in the study area.•The Changjiang Diluted Water significantly affected benthic ecological status.
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2020.111020