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Occurrence of microplastics in freshwater gastropods from a tropical river U-Taphao, southern Thailand
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This study found microplastics in freshwater gastropod snails from a tropical river in southern Thailand, with concentrations ranging from about 4 to 7 particles per individual depending on species and collection site, confirming microplastic ingestion in freshwater invertebrates in Southeast Asia.
The MPs found were as follows: 4.76 particles/individual were found in F. sumatrensis speciosa upstream, 5.20 particles/individual were found in F. sumatrensis speciosa downstream, 7.28 particles/individual were found in P. canaliculata upstream, and 4.00 particles/individual were found in P. canaliculata downstream. It was found in the two-way ANOVA that the accumulation of MPs in gastropods was affected by species and study sites (upstream and downstream). There was a significant difference in the amount of MPs in P. canaliculata between upstream and downstream sites (p = 0.003). Fibers were the most common MPs in both species. Moreover, P. canaliculata upstream had the most significant amount of MPs. The smallest amount of MPs was recorded for P. canaliculata downstream, but there was great diversity in shape, size, and polymer type. MPs sized 500 μm-1 mm were the most common in both species. Fourier transform infrared spectroscopy revealed six polymers: poly (ethylene terephthalate), polypropylene, rayon, polyethyleneimine, polyamine, and poly (propylene: ethylene). The occurrence of MPs in gastropods is alarming for food security in Thailand. The results of this study can be used to support baseline data on MP accumulation among freshwater gastropods.
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A survey of the Nan River in northern Thailand found microplastics in surface water, sediment, and the gastrointestinal tracts of five aquatic species including fish and snails, with polypropylene, nylon, and acrylic polymers most common. The presence of microplastics across multiple ecosystem compartments and aquatic organisms highlights the ecological risks in this biodiversity-important river system and the need for expanded freshwater monitoring in Southeast Asia.
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Researchers found microplastics in 100% of 89 fish gastrointestinal tracts sampled from the Mekong River in Thailand, averaging 23.76 items per individual, with fragments being the dominant shape (83%), particles under 100 µm the most common size, and 17 polymer types identified across species.
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Researchers investigated microplastic accumulation in assassin snails and clams sampled from 39 sites across the Khwae Noi Basin in Thailand, finding filamentous MPs in approximately 26% of snails and 38% of clams, with downstream sites showing higher contamination levels.
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Researchers surveyed microplastic pollution in rivers across Southeast Asia, a region with high plastic waste discharge but limited monitoring data, documenting the distribution and characteristics of microplastics in these understudied waterways.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.