Study On Accumulation Characteristics Of Microplastics Of Typical Organism In The Coastal Wetland Of The Yellow River Estuary

Microplastics refer to plastic fragments with particle size less than 5 millimeters.Due to their small size and stable properties,they can be transferred and diffused under external forces such as biology influence,wind,and ocean currents,and are distributed in different corners of the world.In addition,microplastics can also absorb pollutants in the environment and transfer them to the organism through the biological feeding process,and microplastics can also be transferred from low trophic level to high trophic level through the food chain and accumulated in the organism,thus having adverse effects on the growth,development,reproduction and other processes of the organism.As a new type of environmental pollutant,microplastics have had a profound impact on organism,environment,and ecology.The Yellow River estuary coastal wetland,as a area with the greatest development potential in the eastern coast of China,also faces issues such as wetland pollution.Mastering the data on microplastics in the Yellow River estuary coastal wetland is beneficial for monitoring the characteristics of environmental pollution changes and promoting ecological environment protection and healthy development.This study focuses on typical organisms in the coastal wetlands of the Yellow River Estuary in different seasons,such as bass,flathead,mullet,Chinese mitten crab,and sesarma.Combining the characteristics of microplastics in water and sediment,the cumulative characteristics of microplastics in typical organisms in the coastal wetlands of the Yellow River Estuary in different seasons are studied.We have found that microplastics can be detected in all five typical organisms in the coastal wetlands of the Yellow River estuary.The average abundance range of microplastics is 3.8±0.6-9.7±1.3 items/piece in the fish and 1.2±0.3-5.5±0.5 items/piece in the crabs.The main materials of microplastics on average are Rayon,PE,PET,and the length is mainly less than 2000 μm,the color are mainly transparent,black,and blue,and the shape is mainly linear.Through the detection and analysis of microplastics in the water and sediment of the Yellow River Estuary coastal wetland,we found that the abundance range of microplastics in the water and sediment is 2.4±0.8-8.4±2.7 items/liter,8.4±2.7-43.4±8.2 items/kg,respectively.The main material of microplastics in the water is Rayon,the color is mainly transparent and size is mainly less than 1500 μm,the proportion of linear microplastics is above 80%.The main materials of microplastics in sediment are Rayon,PE,PET,and the color are mainly transparent,blue,and black,with sizes mainly less than 1500 μm,the shape is mainly linear.The composition and size of microplastics are similar to the characteristics of microplastics in living organisms.In addition,the closer to the subtidal zone,the higher the abundance of microplastics in water and sediment,while the abundance of microplastics in water and sediment near the river estuary is relatively high.Through statistical analysis of the basic characteristics of microplastics in the environment,gills,and digestive tract tissues,we found that the basic characteristics of microplastics in gills are highly similar to those in water.The basic characteristics of microplastics in fish digestive tracts are highly similar to those in both water and sediments,while the basic characteristics of microplastics in crab digestive tracts are highly similar to those in sediments.This study investigated the pollution status of microplastics in typical organisms,representative water,and sediments of the Yellow River Estuary coastal wetland.We analyzed the characteristics of microplastics accumulated by typical organisms in different seasons and the possible sources of microplastics.It was found that microplastics are commonly present in the organisms and environment of the Yellow River Estuary coastal wetland,and the microplastics in the organisms mainly come from water and sediments.The relevant data and results have supported the microplastic pollution data of the coastal wetlands in the Yellow River estuary and provide basic data for assessing the potential risks of microplastics and proposing measures to alleviate microplastic pollution in relevant regions.