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Prisutnost mikroplastike i histološka analiza probavne žlijezde dagnji Mytilus galloprovincialis Lamarck, 1819 s područja sjevernog Jadrana
Summary
This Croatian study investigated the presence of microplastics in the digestive glands of Mediterranean mussels (Mytilus galloprovincialis) collected from six stations in the northern Adriatic Sea. Microplastics were detected in all sampled mussels, with fibers being the most common type and histological damage observed in some tissues. The study provides evidence of microplastic exposure and potential harm in mussels from a semi-enclosed sea.
Due to improper waste disposal, insufficient waste and wastewater management, microplastic particles significantly accumulate in terrestrial, freshwater and marine ecosystems. By in entering ecosystems, microplastics can have a significant impact on marine organisms, especially shellfish. The aim of this study was to determine the number, shape and particle size of microplastics in the digestive gland of mussel Mytilus gallopovincialis collected at 6 stations in the northern Adriatic (areas near the cities of Pula, Rovinj and Koper). Histomorphometric analysis and semiquantitative atrophy of the digestive gland microtubules were performed. The largest number of identified microplastic particles was found in the digestive glands of mussels sampled at the Rovinj station (30.2 ± 29.9), and the least at the Katarina (8 ± 2.4) and Strunjan (10 ± 0.5) stations. The most common microplastic particles by color were white (91%), and the least common were yellow (1%). According to the size, the smallest particles from 5 to 10μm the most represented, and according to the shape, the film was the most abundant. Histological analysis of the digestive gland of mussels showed that microplastics can have the greatest impact on the atrophy of the digestive tubules and a decrease in the thickness of the digestive gland epithelium (Rovinj, Kopar). The atrophy of the digestive tubules and decrease in the thickness of the digestive gland epithelium have been shown to be a useful tool for monitoring the influence od microplastics on changes in the histology of the digestive gland.