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"Scheibler, Andrea"
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Occurrence of microplastics in Fish from Mendoza River: First Insights into Plastic Pollution in the Central Andes, Argentina
The widespread use of plastic products in our modern life represents a serious threat to aquatic environments and wild animals that are exposed to plastic waste. Although microplastics (MPs) have been reported in fish from several freshwater environments around the world, mountain environments have been little studied so far. The occurrence of MPs was assessed in the gastrointestinal tracts (GITs) of non-native (rainbow trout Oncorhynchus mykiss and brown trout Salmo trutta) and native (torrent catfish Hatcheria macraei) fish from the Mendoza River in the Central Andes, Argentina. Fibers (85%) were the main MPs type recovered from the fish here analyzed, followed by fragments (15%). Blue fibers were the main type of MPs in analyzed specimens: brown trout (50%), rainbow trout (71%), and torrent catfish (63%). Significant differences in the median total MPs’ abundance and median total fiber abundance were observed among fish species. The highest MPs’ abundance was found in the GITs of brown trout followed by rainbow trout, while the lowest was found in the GITs of torrent catfish. This study represents a baseline for the occurrence and characteristics in terms of shape and color of MPs in freshwater fish collected from a mountain river of the Central Andes.
Journal Article
Effect of food availability and habitat characteristics on the abundance of Torrent Ducks during the early breeding season in the central Andes, Argentina
Torrent Ducks (Merganetta armata) inhabit rivers and streams across the Andes. The species feeds mainly on aquatic invertebrates and occurs in rivers with high flow rate, large emergent rocks, and low anthropogenic disturbance. The objective of this work was to study the effect of food availability and environmental variables on the abundance of Torrent Ducks in two streams with different levels of anthropic disturbance and diverse environmental conditions. To describe each stream, we recorded density and richness of benthic macroinvertebrates and physical-chemical variables, and characterized the stream habitats. We also censused the number of Torrent Ducks present in each stream. We prepared a principal component analysis to portray features of each stream. Generalized linear models were used to estimate which environmental variables were associated with the ducks' abundance and to explore variations in biotic variables between streams and between sections within each stream. We recorded 40 individuals in the stream with the lowest disturbance (Arroyo Grande) and four individuals in the most highly disturbed stream (Río Blanco). Variation in abundance of Torrent Ducks was better explained by a higher density of Notoperla, Plecoptera (an aquatic insect associated with clean waters) and to a lesser extent by flow rate.
Journal Article
Effect of food availability and habitat characteristics on the abundance of the torrent duck during the early breeding season in the Central Andes, Argentina
Fil: Astié, Andrea Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentina
Journal Article