![]() We prepared a principal component analysis to portray features of each stream. We also censused the number of Torrent Ducks present in each stream. ![]() To describe each stream, we recorded density and richness of benthic macroinvertebrates and physical-chemical variables, and characterized the stream habitats. 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. The species feeds mainly on aquatic invertebrates and occurs in rivers with high flow rate, large emergent rocks, and low anthropogenic disturbance. Torrent Ducks (Merganetta armata) inhabit rivers and streams across the Andes.
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