Assessment of spatial distribution, sources, and ecological risks of microplastics in the estuarine and coastal regions of the northern Bay of Bengal

Md Mazharul ISLAM; Jun WANG; A B M Sadique RAYHAN; Junge WANG; Sultan Al NAHIAN; Jingwen SHI; Bin CHEN; Hongwei KE; Chunhui WANG; Minggang CAI

doi:10.1007/s00343-024-4098-5

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Assessment of spatial distribution, sources, and ecological risks of microplastics in the estuarine and coastal regions of the northern Bay of Bengal

Micro- and nano-plastics in marine environments | Updated：2025-03-21

- Assessment of spatial distribution, sources, and ecological risks of microplastics in the estuarine and coastal regions of the northern Bay of Bengal
- Journal of Oceanology and Limnology Vol. 43, Issue 2, Pages: 474-491(2025)
- Affiliations：
  
  1.Coastal and Ocean Management Institute, Xiamen University, Xiamen 361102, China
  2.State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
  3.College of Environment and Ecology, Xiamen University, Xiamen 361102, China
  4.College of Ocean and Earth Science, Xiamen University, Xiamen 361102, China
  5.Department of Marine Biology, Xiamen Ocean Vocational College, Xiamen 361102, China
  6.Key Laboratory of Estuarine Ecological Security and Environmental Health, Education Department of Fujian, Tan Kah Kee College, Xiamen University, Zhangzhou 363105, China
  7.Department of Environmental Science and Engineering, Tan Kah Kee College, Xiamen University, Zhangzhou 363105, China
  8.Department of Navigation, Marine Fisheries Academy, Chittagong 4000, Bangladesh
  9.Environmental Oceanography and Climate Division, Bangladesh Oceanographic Research Institute, Cox’s Bazar 4730, Bangladesh
- Author bio：
  
  mgcai@xmu.edu.cn
- Funds：
- DOI：10.1007/s00343-024-4098-5
  CLC：
- Received：28 March 2024，
  
  Online First：27 June 2024，
  
  Published：01 March 2025
- Accepted：
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ISLAM Md Mazharul,WANG Jun,RAYHAN A B M Sadique,et al.Assessment of spatial distribution, sources, and ecological risks of microplastics in the estuarine and coastal regions of the northern Bay of Bengal[J].Journal of Oceanology and Limnology,2025,43(02):474-491.
DOI：

ISLAM Md Mazharul,WANG Jun,RAYHAN A B M Sadique,et al.Assessment of spatial distribution, sources, and ecological risks of microplastics in the estuarine and coastal regions of the northern Bay of Bengal[J].Journal of Oceanology and Limnology,2025,43(02):474-491. DOI： 10.1007/s00343-024-4098-5.

摘要

Abstract

Microplastics (MPs) have recently emerged as a significant environmental problem with devastating consequences for organisms. Understanding MPs pollution in the Bay of Bengal is crucial for assessing its ecological impact on marine biodiversity and human health. This study examined the occurrence

spatial distribution

physical and chemical properties

ecological risks

and probable sources of MPs in estuarine and coastal marine environments in the northeastern Bay of Bengal. The average concentration of MPs in surface water of the Karnaphuli estuary

the Meghna estu

ary

and the southeastern coastal region were 916.7±462.6 items/m

462.9±324.5 items/m

and 350.0±190.5 items/m

respectively

varying from 105.0±324.5 items/m

to 1 640.0±462.6 items/m

. In the sediments of the Karnaphuli estuary

the Meghna estuary

and the southeast coast of Bangladesh

the average amount of MPs were 94.3±33.1 items/kg

157.6±89.0 items/kg

and 134.3±38.7 items/kg

with a range of 60±33.1 items/kg to 334.3±89.0 items/kg. Most observed MPs were fibers (60.0% in the water; 56.0% in the sediments)

followed by fragments and lines. Detected MPs were dominated by polypropylene (20.7%) in the water

and acrylic (15.4%) in the sediment

black colored (76.2% in the water

72.7% in the sediments)

and 200–500 µm sized (48% in the water

37% in the sediments). Pollution Risk Index (PRI) indicated significant pollution levels (from medium to very high) in estuarine and coastal areas. Multi-statistical analysis indicated land-based inputs (tourists

local waste

agriculture

and industry) dominated the studied regions. The study emphasized the potential impact of MPs pollution on aquatic ecosystems

emphasizing the need for effective management

mitigation methods

continuous surveillance

and thorough evaluation.

关键词

Keywords

references

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