Microplastics contamination in tidelands of the Osaka Bay area in western Japan

Nakao, Satoshi; Ozaki, Asako; Yamazaki, Kazuo; Masumoto, Katashi; Nakatani, Toshio; Sakiyama, Takanori

doi:10.1111/wej.12541

Cited by 21 publications

(4 citation statements)

References 21 publications

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“…This cluster is proposed to be a derivative of 'fabric pilling' that commonly occurs in lifestyle textile products (Sillanpaa and Sainio, 2017;Corami et al, 2020). Indeed, a PET cluster morphologically similar to that of this study was discovered in crabs (C. dehaani) from Osaka Bay, Japan (Nakao et al, 2020).…”

Section: Perspective 2: Microplastic Distributions Along the Flow Dir...supporting

confidence: 75%

Differences in microplastic distributions on the surface freshwater collected using 100– and 355–<i>μ</i>m meshes

Jeong

Kusano

Addai-Arhin

et al. 2022

EMCR

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Microplastics have recently been considered anthropogenic pollutants. Of the arguments to describe microplastic distributions is what mesh size should be employed. Many researchers have reported that the use of different mesh sizes causes naturally generated microplastic quantity differences. However, studies on how much specific microplastic distribution is overlooked in a large mesh remain insufficient in the aquatic environment, particularly in freshwater. Therefore, this study demonstrated qualitative and quantitative differences in microplastic distributions between 100 -and 355μm meshes from five perspectives: numerical/mass abundances, distributions along the flow direction, and microplastic features (size, shape, and polymer type). As observed, median values of numerical and mass abundances were 13.9 particles/m 3 and 6.0 μg/m 3 , respectively, in the 100 μm mesh, then 0.4 particles / m 3 and 1.0 μg/m 3 , respectively, in the 355 μm mesh. Although differences in mass abundances were six times between both meshes, for pristine river characteristics, the difference was ignored in this study. Results also showed that accidental irregularities discovered in the sampling analysis step affected the distribution tendency along the flow direction using the 355 μm mesh. Moreover, the 100 μm mesh showed the highest abundances in the lower sampling station, thereby reflecting the adjacent urban and its tributaries. A gradual increase in numerical fragment abundance toward a smaller size was observed with the 100 μm mesh. Additionally, results showed that cumulative probabilities relating to the minimum Feret diameter of films and fragments were divided into three parts. This division showed a 97% and 67% potential underestimation in the 355 -and 100μm meshes, respectively. Besides, although films, fibers, and fragments having seven polymers were observed in the 100 μm mesh, few shapes and polymer types were revealed in the 355 μm mesh. This finding made it was challenging to trace microplastic origins and presume bioaccumulation potentials using the 355 μm mesh. In conclusion, since the 100 μm mesh revealed completely different distributions from the 355 μm mesh, it was recommended in this study. However, viewpoints that the 355 μm mesh has an advantage in clogging the mesh exist. Therefore, a proper sampling method should be employed by establishing strategic research plans.

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Section: Perspective 2: Microplastic Distributions Along the Flow Dir...supporting

confidence: 75%

Differences in microplastic distributions on the surface freshwater collected using 100– and 355–<i>μ</i>m meshes

Jeong

Kusano

Addai-Arhin

et al. 2022

EMCR

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“…The comparative MPs' abundance in the coastal sediment of Maharashtra is compared with other studies across the world listed in Table 1 . The current investigation has shown higher MPs than Kanzakigawa River estuary, Osaka Bay, Japan (Nakao et al, 2020), Puducherry coastal environment (Dowarah & Devipriya, 2019), Baram River estuary, Borneo Island, Malaysia (Choong et al, 2021), Jagir Estuary, Surabaya City, Indonesia (Firdaus et al, 2020), and Guanabara Bay, Brazil (Alves & Figueiredo, 2019) (Table 1), while less contamination was recorded than in the Gulf of Khambhat, Gujarat (Rabari, Patel, Patel, et al, 2023), Charleston Harbor Estuary, South Carolina, USA (Leads & Weinstein, 2019), Rhine Estuary, Netherland (Leslie et al, 2013), Derwent Estuary, Australia (Willis et al, 2017), and the Goa, India (Gupta et al, 2021) (Table 1). The higher MPs that have been observed in the beach sediment indicate a higher rate of anthropogenic pressure in the study area.…”

Section: Resultsmentioning

confidence: 56%

An assessment of microplastic contamination in beach sediment of Maharashtra State, India, with special reference to anthropogenic activities

Shinde,

Rabari,

Duggal

et al. 2024

Water Environment Research

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The escalating issue of microplastic (MP) pollution poses a significant threat to the marine environment due to increasing plastic production and improper waste management. The current investigation was aimed at quantifying the MP concentration on 25 beaches on the Maharashtra coast, India. Beach sediments (1 kg) were collected from each site, with five replicates to evaluate the extent of MPs. The samples were homogenized, and three 20 g replicas were prepared for subsequent analysis. Later, the samples were sieved, and MPs were extracted using previously published protocols. The abundance of MPs found as 1.56 ± 0.79 MPs/g, ranges from 0.43 ± 0.07 to 3 ± 0.37 MPs/g. Fibers were found as the most abundant shape of MPs. Size‐wise classification revealed dominance of <1 mm and 1–2 mm‐sized MPs. Blue‐ and black‐colored MPs were recorded dominantly. Polymer identification of MPs revealed polyurethane, polypropylene, polyvinyl chloride, acrylic or polymethyl methacrylate, and rubber. The findings revealed that MPs were found to be higher at highly impacted sites, followed by moderately impacted sites and low‐impacted sites, possibly due to a different degree of anthropogenic pressure. The study recommended the urgent need for effective policy to prevent plastics accumulation in the coastal environment of Maharashtra State, India.Practitioner Points The study investigated the abundance and distribution of microplastics in the marine environment, specifically in sediments. The most common type of microplastic found was fibers, followed by fragments and films. Microplastics were found to pose a potential risk to the marine ecosystem, although further research is needed to fully understand their ecological impact. Future research should focus on expanding the sample size, assessing long‐term effects, exploring sources and pathways, and considering size and shape of microplastics. The findings recommended urgent action to mitigate plastic pollution in Maharashtra coast.

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“…In this study, the concentration of MPs in rivers varied significantly depending on the artificial surface area in the sub-basin (p < 0.05). Previous studies demonstrated that the abundance of MPs increases in urbanized areas with respect to sub-urban [38,39], which would explain the higher concentration of MPs found in the Gafos and Lagares rivers compared to the rest of the rivers. These two rivers, among those studied, have the highest proportion of their catchment area urbanized, as can be seen in Figure 1 and in Table 1.…”

Section: Occurrence and Distribution Of Microplastics In Watermentioning

confidence: 91%

Assessment of Microplastic Pollution in River Ecosystems: Effect of Land Use and Biotic Indices

Gutiérrez-Rial,

Villar,

Álvarez-Troncoso

et al. 2024

Water

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The proximity of freshwater ecosystems to anthropogenic activities makes them one of the most threatened environments by plastic pollution in the form of microplastics (MPs). Therefore, it is crucial to identify the primary drivers of MP dynamics in rivers to enhance their management. This work analyzed the concentration of MPs in water and sediments and evaluated the influence of land use and its relationship with the main biotic indices employed to assess the water quality of rivers. This research was carried out in four different catchments, with three sampling points established in each river basin. The results revealed that MPs were ubiquitous across all locations, with concentrations ranging from 0.10 to 35.22 items m−3 in waters and from 26 to 643 items Kg−1 in sediments. The highest concentration of MPs both in water and sediments were found in the Lagares River (35.22 items m−3 and 643 items Kg−1), while the lowest concentrations were found in the Miñor River for water (0.10 items m−3) and Tea River for sediments (138 items Kg−1). Urbanization degree was identified as the primary driver of MP pollution in water, whereas population density correlated with sediment pollution levels. These findings explain the elevated MPs abundance in the more urbanized and populated Gafos and Lagares rivers compared to the relatively pristine Miñor and Tea rivers. Furthermore, the presence of MPs in sediments was found to negatively impact the most sensitive benthic macroinvertebrate taxa, as evidenced by lower values of the IASPT and EPT indices at sampling points with higher sediment MPs concentrations (Gafos and Lagares).

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Microplastics contamination in tidelands of the Osaka Bay area in western Japan

Cited by 21 publications

References 21 publications

Differences in microplastic distributions on the surface freshwater collected using 100– and 355–<i>μ</i>m meshes

Differences in microplastic distributions on the surface freshwater collected using 100– and 355–<i>μ</i>m meshes

An assessment of microplastic contamination in beach sediment of Maharashtra State, India, with special reference to anthropogenic activities

Assessment of Microplastic Pollution in River Ecosystems: Effect of Land Use and Biotic Indices

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