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Souza-Santos LP, Silva CC, Barcellos RL, Souza Neto JA. Assessing sediment quality at tropical mangrove areas for using as reference sites in ecotoxicological bioassays. MARINE POLLUTION BULLETIN 2024; 205:116607. [PMID: 38896957 DOI: 10.1016/j.marpolbul.2024.116607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Revised: 06/11/2024] [Accepted: 06/14/2024] [Indexed: 06/21/2024]
Abstract
The sediment of five mangrove in Pernambuco/Brazil was investigated to find a reference site for toxicity bioassays. Sediment characteristics, metal levels, and toxic effects on the nauplius of the copepod Tisbe biminiensis were studied. The sediment was composed by terrigenous muds and siliciclastic sands with medium to high organic matter contents. The FeAs association show most of the high concentrations and positive correlation among its constituents in the south. In the north, the Ca-Sr-La association is higher and exhibits positive correlation among its components that usually found in carbonate rocks. Very intense toxic effects were observed, mainly in the south, with >70 % reductions in development. As and Hg were positively correlated with mortality and decrease in development. The sediment quality at studied mangroves prevent their use as a reference site in bioassays. These could be linked to the direct/perennial contribution of geogenic sources associated with anthropogenic environmental impacts.
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Affiliation(s)
- L P Souza-Santos
- Laboratório de Cultivo e Ecotoxicologia, Departamento de Oceanografia, Universidade Federal de Pernambuco, Av. Arquitetura s/n, Cidade Universitária, Recife, Pernambuco 50740-550, Brazil.
| | - C C Silva
- Programa de Pós-Graduação em Oceanografia, Departamento de Oceanografia, Universidade Federal de Pernambuco, Av. Arquitetura s/n, Cidade Universitária, Recife, Pernambuco 50740-550, Brazil
| | - R L Barcellos
- Laboratório de Oceanografia Geológica, Departamento de Oceanografia, Universidade Federal de Pernambuco, Av. Arquitetura s/n, Cidade Universitária, Recife, Pernambuco 50740-550, Brazil
| | - J A Souza Neto
- Programa de Pós-Graduação em Geociências, Departamento de Geologia, Universidade Federal de Pernambuco, Av. Arquitetura s/n, Cidade Universitária, Recife, Pernambuco 50740-550, Brazil
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Liu T, Bao K, Chen M, Neupane B, Gao C, Zaccone C. Human activity has increasingly affected recent carbon accumulation in Zhanjiang mangrove wetland, South China. iScience 2024; 27:109038. [PMID: 38361628 PMCID: PMC10867414 DOI: 10.1016/j.isci.2024.109038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 12/04/2023] [Accepted: 01/23/2024] [Indexed: 02/17/2024] Open
Abstract
Mangrove wetlands are an important component of blue carbon (C) ecosystems, although the anthropogenic impact on organic C accumulation rate (OCAR) in mangrove wetlands is not yet clear. Three sediment cores were collected from Zhanjiang Gaoqiao Mangrove Reserve in Southern China, dated by 210Pb and 137Cs, and physico-chemical parameters measured. Results show that the OCARs in mangroves and grasslands have significantly increased by 4.4 and 1.3 times, respectively, since 1950, which is consistent with the transformation of organic C sources and the increase of sedimentation rate. This increment is due to increased soil erosion and nutrient enrichment caused by land use change and the discharge of fertilizer runoff and aquaculture wastewater. This study provides clear evidence for understanding the changes in organic C accumulation processes during the Anthropocene and is conducive to promoting the realization of C peak and neutrality targets.
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Affiliation(s)
- Ting Liu
- School of Geographical Sciences, South China Normal University, Guangzhou 510631, China
| | - Kunshan Bao
- School of Geographical Sciences, South China Normal University, Guangzhou 510631, China
| | - Minqi Chen
- School of Geographical Sciences, South China Normal University, Guangzhou 510631, China
| | - Bigyan Neupane
- School of Geographical Sciences, South China Normal University, Guangzhou 510631, China
| | - Changjun Gao
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, Guangdong Academy of Forestry, Guangzhou 510520, China
| | - Claudio Zaccone
- Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
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Cui Y, Dong J, Wang H, Shang M, Xie H, Du Y, Li Y, Wang Y. Spatiotemporal response of water quality in fragmented mangroves to anthropogenic activities and recommendations for restoration. ENVIRONMENTAL RESEARCH 2023; 237:117075. [PMID: 37683780 DOI: 10.1016/j.envres.2023.117075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 08/29/2023] [Accepted: 09/04/2023] [Indexed: 09/10/2023]
Abstract
Mangroves have received substantial attention for their pivotal role as ecological barriers between land and sea, owing to their capacity to effectively capture considerable quantities of terrestrial pollutants. Mangrove fragmentation has been a widespread global trend. There is limited information on the water quality status of these small scattered mangrove patches in coastal sub-developed areas, coupled with a paucity of efficient and intuitive assessment methodologies. To address this gap, the Water Quality Index (WQI) was introduced to evaluate the spatiotemporal characteristics of mangrove water quality. The major sources of pollution and anthropogenic activities that affect mangrove water quality were identified. The results revealed an average WQI value of 44.1 ± 13.3 for mangrove patches, consistently indicating a "low" water quality classification throughout all seasons. Both the size and natural conditions impact the water quality of mangroves. The large artificial patch (WQI: 56.4 ± 7.61) and the natural patch (WQI: 46.6 ± 13.6) exhibited relatively superior water quality, while the WQI value of a size-equivalent artificial patch compared with the natural patch is 38.6 ± 11.8. Aquaculture was the primary human activity that adversely affected the water quality of mangroves, and the potential sources of pollution were rainfall runoff and river discharge. These findings elucidate the unfavorable water quality characteristics and dominant pollution of fragmented mangroves, and validate the applicability of the WQI method for long-term evaluation of the water quality in mangrove patches. This study provides a basis for decision-making in water quality assessment and management of coastal wetlands and marine ecosystems. Scientific guidance to the management for mangrove protection and restoration was offered, such as regulating aquaculture activities, controlling non-point source pollution, implementing mangrove reforestation by using native species in historical mangrove sites.
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Affiliation(s)
- Yang Cui
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, 210023, China
| | - Jianwei Dong
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, 210023, China.
| | - Hongbing Wang
- Haikou Marine Geological Survey Center, China Geological Survey, Haikou, 571172, China.
| | - Meiqi Shang
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, 210023, China
| | - Hui Xie
- Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Yongfen Du
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, 210023, China
| | - Yufeng Li
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, 210023, China
| | - Yang Wang
- Lu'an Three Gorges Corporation Water Co., Ltd, Lu'an, 237010, China
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Hasan J, Chandra Shaha D, Rani kundu S, Ahmed M, Haque SM, Haque F, Ahsan ME, Ahmed S, Hossain MI, Salam MA. Outwelling of nutrients into the Pasur River estuary from the Sundarbans mangrove creeks. Heliyon 2022; 8:e12270. [PMID: 36578382 PMCID: PMC9791836 DOI: 10.1016/j.heliyon.2022.e12270] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 11/05/2022] [Accepted: 12/02/2022] [Indexed: 12/14/2022] Open
Abstract
The Pasur River estuary (PRE), the largest estuary in the Sundarbans mangrove area, provides vital fishery resources and supports millions of livelihoods in the southwestern coastal region of Bangladesh. This study focused on the tidal and run-off effects on the outwelling of nutrients from the Sundarbans mangrove creeks to the PRE. Spatial and temporal variations of nutrient and chlorophyll-a concentrations were assessed by water sampling at 11 stations in the study area from January to December 2019. Dissolved inorganic nutrients and chlorophyll-a were analyzed by standard methods using a spectrophotometer. In the tidal mangrove creeks, dissolved inorganic nitrogen, phosphate, and silica concentrations were significantly higher (p < 0.05) during the spring tide than those during the neap tide, suggesting that these nutrients were flushed from the mangrove area by the inundation and tidal mixing of the spring tide. In general, chlorophyll-a (mean ± SD) concentrations in the PRE and the tidal mangrove creeks were 5.62 ± 1.30 μg/L and 9.03 ± 0.59 μg/L in the wet season, respectively. During the dry season, the chlorophyll-a decreased to 4.37 μg/L ± 0.68 and 4.94 ± 1.52 μg/L in the PRE and the tidal mangrove creek, respectively. The amount of nutrients outwelled from the mangrove creeks to the estuary was 1.53 ± 0.67 mg/L DIP, 0.001 ± 0.0004 mg/L DIN, and 1.38 ± 0.48 mg/L dissolved silica. DIP, silica, and chlorophyll-a concentrations were significantly higher (p < 0.05) during the spring tide compared to the neap tide, but salinity was not significantly (p > 0.05) different between the two tidal levels. This study showed that the mangrove creeks formed an important link in transporting nutrients from the mangrove forest to the estuary.
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Affiliation(s)
- Jahid Hasan
- Coastal and Marine Dynamics Laboratory, Department of Fisheries Management, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh
| | - Dinesh Chandra Shaha
- Coastal and Marine Dynamics Laboratory, Department of Fisheries Management, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh,Corresponding author.
| | - Sampa Rani kundu
- National Oceanographic and Maritime Institute, 10/8 Eastern Plaza, Sonargaon Road, Hatirpool, Dhaka 1219, Bangladesh
| | - Minhaz Ahmed
- Department of Agroforestry and Environment, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh
| | - Shahroz Mahean Haque
- Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
| | - Farhana Haque
- Coastal and Marine Dynamics Laboratory, Department of Fisheries Management, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh
| | - Md. Emranul Ahsan
- Coastal and Marine Dynamics Laboratory, Department of Fisheries Management, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh
| | - Salman Ahmed
- Coastal and Marine Dynamics Laboratory, Department of Fisheries Management, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh
| | - Md. Iqbal Hossain
- Department of Agroforestry and Environment, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh
| | - Mohammad Abdus Salam
- Department of Genetics and Fish Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh
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