RT Journal Article T1 The human connection: First evidence of microplastics in remote high mountain lakes of Sierra Nevada, Spain. A1 Godoy, Veronica A1 Calero, Monica A1 Gonzalez-Olalla, Juan M A1 Martin-Lara, Maria A A1 Olea, Nicolas A1 Ruiz-Gutierrez, Adrian A1 Villar-Argaiz, Manuel K1 Citizen science K1 Freshwater contamination K1 High-mountain lakes K1 Microplastics K1 Spanish Sierra Nevada AB Microplastics have become one of the most serious global threats to animal and human health. While their presence has been documented in all Earth water ecosystems, including remote mountain lakes, the observation that the abundance of microplastics is largely different across nearby lakes has rarely been examined. As part of a citizen science initiative, this study analyzed for the first time the abundance of microplastics in the surface of 35 glacial lakes of Sierra Nevada National Park in Southern Spain with the objective of determining the local factors that control their abundance. First, we described the shape, size, color and nature of microplastics. Second, we tested whether the number of microplastics differed between basins and analyzed environmental and morphometrical features of lakes affecting their abundance. We found that microplastics were common in most lakes, with a maximum abundance of 21.3 particles per liter that akin to some of the most microplastic polluted lakes worldwide. Fragments were the predominant shape (59.7%) followed by fibers (38.8%) and very scarce spheres (1.5%). Microplastics were observed for all size-fractions, but the abundance of particles PB Elsevier Ltd YR 2022 FD 2022-08-04 LK http://hdl.handle.net/10668/22207 UL http://hdl.handle.net/10668/22207 LA en NO Godoy V, Calero M, González-Olalla JM, Martín-Lara MA, Olea N, Ruiz-Gutierrez A, et al. The human connection: First evidence of microplastics in remote high mountain lakes of Sierra Nevada, Spain. Environ Pollut. 2022 Oct 15;311:119922. DS RISalud RD Apr 7, 2025