Microplastic pollution in the littoral sediments of the northern part of the Oman Sea

Kor, Kamalodin; Ghazilou, Amir; Ershadifar, Hamid

doi:10.1016/j.marpolbul.2020.111166

Cited by 53 publications

(12 citation statements)

References 58 publications

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“…The results showed that the microplastics identified in Qara Su River in Ardabil included fragment, fiber granule, and film, and in the studied stations, two types of microplastics, pellets and foams were not identified. Kor et al (2020) found that in Oman coastal sediments, microplastics including fiber, fragment, and film types were about 32.5%, 45%, and 22.5 (Kor et al 2020). In the study of Mao et al (2021), the microplastic type in the sediments of Wuliangsuhai Lake, northern China, contained 53.95% fiber and 38.3% fragment (Mao et al 2021).…”

Section: Microplastics Contentmentioning

confidence: 96%

Microplastic pollution in sediments in the urban section of the Qara Su River, Iran

et al. 2022

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Microplastic pollution is an emerging threat to marine environments with potential environmental, social, economic, and health consequences and has become a major global environmental issue. The objective of the present study was to evaluate microplastic contamination in the ecosystem of the Qara Su River in Ardabil, Iran. Fifteen sampling sites along the Qara Su River in the Ardabil urban area were selected to collect sediment samples. The abundance and morphological characteristics of microplastics were determined by counting using a digital stereomicroscope. Micro-Fourier transform-infrared spectroscopy (μ-FTIR) analysis was used to identify polymer type of the microplastics. In this study, the frequency and distribution of microplastics (< 5 mm) in the sediment of Qara Su River were investigated as one of the sources containing microplastics. Sediment samples were collected from five different sites (Karkarq, Sar band, Anzab Sulfa, Dolat abad, and Samian) from September to March 2020. For microplastic examination in sediment, the amount (approximately 1000 g of fresh sediment from each site) was sampled from 15 sites. Fiber microplastics (53%) and fragments (33%) microplastics were predominant. It has shown the abundance and heterogeneity of space. In this study, the highest amount of microplastics detected in sediment samples was related to the size of less than 5000 µm (92%). The frequency of microplastics below 5000 µm in sediment was attributed to the low capacity of existing processes in Ardabil wastewater treatment plant. The abundance of microplastics shows significant differences between sampling sites. The Qara Su River along the city of Ardabil, like many other rivers, is contaminated with microplastics. This study was the first study conducted for evaluation of the sediment environment in terms of the microplastic pollution of Qara Su River in Ardabil. Considering the amount of microplastics in sediments, further research is required to estimate the amount of microplastics released by Ardabil wastewater treatment plants and industrial town wastewater, and other possible sources of emission and to evaluate their contribution to microplastic pollution in water, sediment, and soil. This study provided a framework for future studies of microplastics pollution in the sediment of urban areas around the Qara Su River in Iran.

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Section: Microplastics Contentmentioning

confidence: 96%

Microplastic pollution in sediments in the urban section of the Qara Su River, Iran

et al. 2022

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“…Determining the effects of microplastics and leachate on the physiology of hermit crabs, particularly lactate and glucose levels [46], would also help to determine how plastic pollution affects fighting ability. In terms of hermit crabs in the environment, we highlight potentially damaging effects of microplastics and leachate on survivability of this species, particularly as they reside in habitats such as rocky shores and the littoral zone that can be heavily polluted [40]. Furthermore, royalsocietypublishing.org/journal/rsos R. Soc.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, microplastic exposure was shown to decrease startle response time in P. bernhardus, which also increases susceptibility to predation [39]. Hermit crabs inhabit the littoral zone, where microplastic pollution is found in high abundances [40], putting them at a higher risk of microplastic exposure. Given microplastic exposure affected the information gathering and decision making during shell selection behaviour in hermit crabs [38], there is a strong rationale that shell contest behaviour will royalsocietypublishing.org/journal/rsos R. Soc.…”

Section: Introductionmentioning

confidence: 99%

Animal contests and microplastics: evidence of disrupted behaviour in hermit crabsPagurus bernhardus

et al. 2021

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Microplastics are ubiquitous in global marine systems and may have negative impacts on a vast range of species. Recently, microplastics were shown to impair shell selection assessments in hermit crabs, an essential behaviour for their survival. Hermit crabs also engage in ‘rapping’ contests over shells, based on cognitive assessments of shell quality and opponent fighting ability and, hence, are a useful model species for examining the effects of microplastics on fitness-relevant behaviour in marine systems. Here, we investigated how a 5-day microplastic exposure (25 microplastics/litre) affected the dynamics and outcome of 120 staged hermit crab contests. Using a 2 × 2 factorial design, we examined how microplastics (i.e. presence or absence) and contestant role (i.e. attacker or defender) affected various behavioural variables. Significantly higher raps per bout were needed to evict microplastic-treated defenders when attackers were pre-exposed to control conditions (i.e. no plastic). Also, significantly longer durations of rapping bouts were needed to evict control-treated defenders when attackers were pre-exposed to microplastics. We suggest that microplastics impaired defenders' ability to identify resource holding potential and also affected attackers’ rapping strength and intensity during contests. These impacts on animal contests indicate that microplastics have broader deleterious effects on marine biota than currently recognized.

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“…In the Caspian coastal environment, the pollution of microplastics varies in the number of microplastics [12]. Microplastic pollution is common in various environments of the Bristol Strait beach, United Kingdom [13].…”

Section: Microplastic Distributionmentioning

confidence: 99%

The impact of microplastic pollution on ecological environment: a review

Mao¹,

Xu²,

Cheng³

et al. 2022

Front. Biosci. (Landmark Ed)

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Microplastic pollution and its impact on the ecological environment have attracted worldwide attention. The strong adsorption capacity of the microplastic surface plays an important role in the migration of microplastics throughout the environment. Synergistic effects between microplastics and persistent organic pollutants increase the toxicity of pollutants to organisms. In addition, microplastics cause different degrees of harm to aquatic organisms with different nutritional levels. However, the toxic effects of microplastics and organic pollutants on organisms, the distribution of microplastics in higher aquatic organisms, and the nutrient transfer in complex aquatic food webs require further research. Therefore, studying the impact of microplastics on the ecological environment would provide insights into controlling microplastic pollution. This paper in-depth discusses the source, distribution, and transmission of microplastics and summarizes the current situation of the impact of microplastics on the ecological environment, including physical, chemical, and biological effects. This paper also suggests topics for further research on the influence of microplastics on various aspects of the ecological environment.

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Microplastic pollution in the littoral sediments of the northern part of the Oman Sea

Cited by 53 publications

References 58 publications

Microplastic pollution in sediments in the urban section of the Qara Su River, Iran

Microplastic pollution in sediments in the urban section of the Qara Su River, Iran

Animal contests and microplastics: evidence of disrupted behaviour in hermit crabsPagurus bernhardus

The impact of microplastic pollution on ecological environment: a review

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