Characteristics and distribution of microplastics in the coastal mangrove sediments of China

Zhou, Qian; Tu, Chen; Fu, Chuancheng; Li, Yuan; Zhang, Haibo; Xiong, Kedi; Zhao, Xinyue; Li, Lianzhen; Waniek, Joanna J; Luo, Yongming

doi:10.1016/j.scitotenv.2019.134807

Cited by 148 publications

(60 citation statements)

References 41 publications

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“…Nor and Obbard [25] reported averages of 12 to 63 MPs/kg in mangroves of Singapore while Zhang et al [59] reported MP averages ranging from 273 to 3520 MPs/kg in mangroves further away from the city and mangroves closer to industrial/urban zones, respectively, in China. Based on these and other recent reports (e.g., [28,30,60]), South African mangroves can, therefore, be considered moderately (e.g., St. Lucia) to highly (e.g., Isipingo) polluted by MPs compared with other parts of the world. This is concerning when one considers that South Africa is a developing country with high population growth [61], limited consumer and environmental awareness, and multiple waste management inadequacies [62].…”

Section: Abundance Of Microplastics In Mangrove Sedimentmentioning

confidence: 70%

“…For example, the system that was the least anthropogenically disturbed exhibited the highest concentration of fibres ( Figure 6) and the highest proportion of fine (<125 µm) sediment, while the most disturbed system exhibited lower concentrations of fibres and the lowest proportion of fine sediment. This suggests that mangroves characterised by very fine sand/mud may harbour more fibres than other particle types [60]. However, it should be noted that several studies [25,32,64,68] have reported no clear relationship between MP abundance and sediment size, highlighting the need to understand how edaphic factors influence MP deposition and how deposited MPs may, in turn, influence the soil characteristics.…”

Section: Relationship Between Microplastics In Mangrove Sediment and mentioning

confidence: 99%

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Towards Characterising Microplastic Abundance, Typology and Retention in Mangrove-Dominated Estuaries

Govender

Naidoo

Rajkaran

et al. 2020

Water

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Plastic and, particularly, microplastic (MP) pollution is a growing research theme, dedicated largely to marine systems. Occurring at the land–sea interface, estuarine habitats such as mangroves are at risk of plastic pollution. This study compared MP pollution (level, morphotype, polymer composition, size and colour) across four South African estuaries, in relation to the built and natural environment. Mouth status, surrounding human population densities and land-use practices influenced the level and type of MP pollution. Systems that were most at risk were predominantly open estuaries surrounded by high population densities and diverse land use types. Microplastic levels and the diversity of types detected increased with increasing levels of anthropogenic disturbance. Overall, microfibres dominated in estuarine water (69%) and mangrove sediment (51%). Polyethylene (43%) and polypropylene (23%) were the dominant polymers overall. Weathered fishing gear, weathered packaging items and run-off from urban/industrial centres are probable sources of MP pollution . Increased run-off and river input during the wet/rainy season may explain the markedly higher MP loads in estuarine waters relative to the dry season. By contrast, MP deposition in mangrove sediment was higher during the dry season. Sediment MP abundance was significantly positively correlated with both pneumatophore density and sediment size (500–2000 µm). This study highlights the role of mangroves as MP sinks, which may limit movement of MPs into adjacent environments. However, under conditions such as flooding and extreme wave action, mangroves may shift from sinks to sources of plastic pollution.

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Section: Abundance Of Microplastics In Mangrove Sedimentmentioning

confidence: 70%

Section: Relationship Between Microplastics In Mangrove Sediment and mentioning

confidence: 99%

Towards Characterising Microplastic Abundance, Typology and Retention in Mangrove-Dominated Estuaries

Govender

Naidoo

Rajkaran

et al. 2020

Water

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“…The distribution of thin-lm microplastics could result from the transport of nearby salt elds or the fragmentation of plastic mulch used in horticulture (de Jesus Piñon-Colin et al 2018). More than 93% of microplastics in the beach sands and sea sediments of mangroves are fragmented, predicting the origin of microplastics as secondary sources from large plastic fragments (Zhou et al 2020). These conclusions are relatively appropriate with the proportion of microplastic shapes due to different anthropogenic activities of the sampling sites.…”

Section: Physical Characteristicsmentioning

confidence: 99%

Physical and Chemical Characteristics of Microplastic in Beach Sand in Can Gio, Ho Chi Minh City, Vietnam

Nhon

Nguyen

Hai

et al. 2021

Preprint

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Microplastics pollution in Vietnam has been received more attention in recent years due to its adverse impacts on the environment. The coastal areas, especially estuary is potential accumulation zone of microplastics. These locations, where inland waters meet the ocean, are heavily impacted by anthropogenic activities and the dynamic of the sea currents. This study aims to investigate the spatial distribution, physical characteristics, and chemical composition of microplastics in beach sand in Can Gio, Ho Chi Minh city, Vietnam. A total of 90 sand samples from five sampling sites were collected in November 2019, they were analyzed for size, shape, color, and identity. The results showed that microplastics concentration ranged from 0 to 6.58 pieces/ kg d.w. Microplastics tend to be distributed along the upper-shore line and in the surface layer of sand. The data revealed that microplastics ranging from 2.8–5 mm were the most abundant (72.46%), pellet shape accounted for the highest proportion (41.31%), white and blue are two popular colours up to 80% in total of detected microplastics. Chemical composition of the microplastics was determined by attenuated total reflection-Fourier transform infrared (FTIR-ATR) spectroscopy, polypropylene and polystyrene are the two most common plastic types in this study. Macroplastics found in beach sand samples were also assessed, the study shows a positive correlation between microplastic and macroplastic, showing the possible origin of microplastics. The findings of this study provided more insights into the microplastic pollution status in beach sand and the foundation for future investigation.

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“…K. obovata adapts to transitional ecosystems where the land and ocean meet by overcoming periodic and aperiodic tidal effects, which induce high salinity, severe erosion, and anaerobic conditions 8 . K. obovata plays a crucial role in protecting biodiversity and combating erosion 9,10 . Specifically, the mangrove K. obovata can protect the embankment, accelerate the natural deposition of the beach, filter organic matter and pollutants from inland areas, and provide an ideal habitat for the marine flora and fauna 11 .…”

Section: Introductionmentioning

confidence: 99%

Chromosome-scale assembly of the Kandelia obovata genome

Sun

Tsai³

et al. 2020

Hortic Res

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The mangrove Kandelia obovata (Rhizophoraceae) is an important coastal shelterbelt and landscape tree distributed in tropical and subtropical areas across East Asia and Southeast Asia. Herein, a chromosome-level reference genome of K. obovata based on PacBio, Illumina, and Hi-C data is reported. The high-quality assembled genome size is 177.99 Mb, with a contig N50 value of 5.74 Mb. A large number of contracted gene families and a small number of expanded gene families, as well as a small number of repeated sequences, may account for the small K. obovata genome. We found that K. obovata experienced two whole-genome polyploidization events: one whole-genome duplication shared with other Rhizophoreae and one shared with most eudicots (γ event). We confidently annotated 19,138 protein-coding genes in K. obovata and identified the MADS-box gene class and the RPW8 gene class, which might be related to flowering and resistance to powdery mildew in K. obovata and Rhizophora apiculata, respectively. The reference K. obovata genome described here will be very useful for further molecular elucidation of various traits, the breeding of this coastal shelterbelt species, and evolutionary studies with related taxa.

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Characteristics and distribution of microplastics in the coastal mangrove sediments of China

Cited by 148 publications

References 41 publications

Towards Characterising Microplastic Abundance, Typology and Retention in Mangrove-Dominated Estuaries

Towards Characterising Microplastic Abundance, Typology and Retention in Mangrove-Dominated Estuaries

Physical and Chemical Characteristics of Microplastic in Beach Sand in Can Gio, Ho Chi Minh City, Vietnam

Chromosome-scale assembly of the Kandelia obovata genome

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