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Evidence of microplastics in water and commercial fish from a high-altitude mountain lake (Lake Titicaca)
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Researchers evaluated the presence of microplastics in both water samples and the stomach contents of four commercially fished species from Lago Menor of Lake Titicaca, a high-altitude ancient lake at 3,809 m above sea level on the Bolivia-Peru border, documenting microplastic contamination in this remote ecosystem.
Microplastic pollution is a widespread environmental concern. Like other anthropogenic pollutants, microplastics can reach aquatic ecosystems through rivers and interact with the aquatic biota. For instance, Lake Titicaca (between Bolivia and Peru), one of the great ancient lakes in South America (3,809 m a.s.l.), shows a pollution problem, particularly in the southern shallow basin (Lago Menor) in Bolivia. Nevertheless, our knowledge of the presence of microplastics and their interaction with the biota of Lake Titicaca is limited. Therefore, this study evaluated the presence of microplastics in the stomach content of the four fish species targeted by local fisheries in Lago Menor of Lake Titicaca (Orestias luteus, Orestias agassizii, Trichomycterus dispar, and Odonthestes bonariensis; N = 1,283), and looked for relationships with trophic guilds or fishing areas. Additionally, surface water was analyzed to evaluate the presence of microplastics in the water. The evaluation of microplastics was carried out by visual observations. We observed that the frequency of microplastic ingestion was low in all species (<5%). Conversely, microplastic was present in the water, with the highest quantity at the southern part of Lago Menor (103 ± 20 particles per L), without differences in the microplastic number between sites. Most microplastics counted in stomach contents were fibers, whereas water samples mainly contained fragments. Our results point to microplastic pollution in Lago Menor of Lake Titicaca. However, we could not determine the pollution rate due to considerable methodological limitations. Further research will be needed to robustly detect microplastics in Lake Titicaca and their impact on the fish species in the lake.
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Peer Review #2 of "Evidence of microplastics in water and commercial fish from a high-altitude mountain lake (Lake Titicaca) (v0.1)"
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This is a second peer review document for the same Lake Titicaca microplastic study, providing an additional expert assessment of the research methodology and conclusions. Multiple peer reviews help ensure the quality and accuracy of published microplastic contamination data. Lake Titicaca at 3,809 meters elevation represents an important case study for understanding how microplastics reach remote high-altitude water bodies.
Peer Review #3 of "Evidence of microplastics in water and commercial fish from a high-altitude mountain lake (Lake Titicaca) (v0.2)"
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This is a peer review document associated with a study investigating microplastic contamination in water and commercial fish from Lake Titicaca, Peru and Bolivia. The peer reviewer assessed the methodology and findings of the original study, which documented microplastic pollution in one of South America's most important high-altitude lakes. Such peer review documents provide transparency in the scientific publication process.
Peer Review #2 of "Evidence of microplastics in water and commercial fish from a high-altitude mountain lake (Lake Titicaca) (v0.2)"
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This is a duplicate peer review document for the Lake Titicaca microplastic study, representing another reviewer's assessment. The original study investigated microplastic contamination in water and commercially important fish from this high-altitude South American lake. The peer review process for this study documented the rigor required to publish environmental monitoring data from a sensitive ecosystem.
Peer Review #3 of "Evidence of microplastics in water and commercial fish from a high-altitude mountain lake (Lake Titicaca) (v0.1)"
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This is another peer review document from the Lake Titicaca microplastic study review process. The original research examined whether microplastics from human settlements and river inputs have reached this ecologically and culturally significant South American lake. Multiple peer reviews confirm the scientific scrutiny applied to the original contamination findings.
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