Microplastics in biotic and abiotic compartments of high-mountain lakes from Alps. (June 2023)

• Record Type: Journal Article
• Authors: Pastorino, Paolo; Anselmi, Serena; Esposito, Giuseppe; Bertoli, Marco; Pizzul, Elisabetta; Barceló, Damià; Elia, Antonia Concetta; Dondo, Alessandro; Prearo, Marino; Renzi, Monia
• Is Part Of: Ecological indicators. Volume 150(2023)
• Publication Date: 2023-06
• Subjects: Copepods -- Microplastic pollution -- Rana temporaria -- Remote ecosystems -- Salvelinus fontinalis; Environmental monitoring -- Periodicals; Environmental management -- Periodicals; Environmental impact analysis -- Periodicals; Environmental risk assessment -- Periodicals; Sustainable development -- Periodicals; 333.71405
• DOI: 10.1016/j.ecolind.2023.110215
• Languages: English
• ISSNs: 1470-160X

Abstract

Graphical abstract: Highlights: No microplastic items were found in water and zooplankton samples. Low microplastic items were found in sediment, tadpoles, and fish. Young fish resulted more contaminated by microplastic items. Shape, color, and chemical type of microplastics were the same in all compartments. Salvelius fontinalis could be a good bioindicator of microplastic pollution. Abstract: Microplastic (MP) pollution is a major environmental concern for mountain ecosystem and for high-mountain lakes in particular, which are recognized indicators of global change. In this study, the presence of MPs was assessed in abiotic (water and sediment) and biotic (zooplankton, tadpoles, fish) compartments of two high-mountain lakes (Upper Lake Balma and Lower Lake Balma) in the Cottian Alps (northwest Italy). No MPs were found in water and zooplankton samples, whereas the mean MPs in sediment samples was 1.33 ± 0.67 items/m 3 and 1.75 ± 0.62 items/m 3 in Lower and Upper Lake Balma, respectively. The mean MPs in tadpoles of Rana temporaria was 0.33 ± 0.58 items/individual and 0.66 ± 0.58 items/individual in Lower and Upper Lake Balma, respectively. The mean number of MPs items found in the gastrointestinal tract (GIT) of fish ( Salvelinus fontinalis ) was considerably higher in specimens from the Lower (0.45 items/g GIT) than in those from the Upper Lake (0.20 items/g GIT). There was a negative relationship between fish size (weight and age) and MPs abundance in the GIT of fish, indicating that young fish accumulated more MP items probably due to the high prey ingestion rate compared to adults. The same MPs color (blue, white, black), shape (fibers and fragments), and chemical type (polypropylene and polyethylene) were found in the compartments of both lakes. Our findings suggest the use of S. fontinalis as an indicator of MP pollution in high-mountain lakes. Further studies are needed to better understand the sources and the effects of MPs in these remote ecosystems.