Secondary production is the formation of heterotrophic biomass across time, which integrates several important ecological processes that affect the life of organisms, populations, communities and ecosystems, but its study has poor developed in South America. The objectives of this work were to describe the diversity of benthic macroinvertebrate assemblages in terms of abundance and biomass, and to quantify their secondary production for the first time in Andean rivers. A quantitative sampling scheme was implemented, using a Surber sampler, in three forested streams. Physicalchemical variables, nutrients, organic matter and chlorophyll were measured also. The macroinvertebrates were separated and identified mostly at the species level. Each taxon was assigned to a functional feeding group. Secondary production was estimated for 38 taxa, mostly Diptera, Trichoptera, Coleoptera, and Ephemeroptera. The annual production varied from 3769 to 13916 mg dry mass m -2 y -1 . Most abundant taxa were also those with higher production, dominated by Ephemeroptera (Baetidae), Trichoptera (Hydropsychidae) and Diptera (Chironomidae and Simuliidae). Density, biomass, and production of collectors and predators were much higher than the other feeding groups.We expect that our results will be useful to evaluate the effects on stream functioning produced by global warming and other anthropogenic disturbances in our region.

Se brinda un inventario preliminar con datos de distribución, hospederos y hábitat de los lepidópteros acuáticos y semiacuáticos registrados en Argentina. El mismo se basa en un relevamiento intensivo de datos bibliográficos,especímenes depositados en la Colección Instituto – Fundación Miguel Lillo (IFML) y registros propios de relevamientos de campo. El objetivo del presente trabajo es presentar la diversidad de familias, géneros y especies de Lepidópteros acuáticos que se registran hasta el presente en Argentina aportando información de la distribución geográfica, hospederos,hábitos y de biología. Comprende datos de 11 familias (Coelophoridae,Cosmopterigidae,Crambidae, Erebidae,Gracillaridae, Momphidae, Pterophoridae, Pyralidae, Nepticulidae, Sphingidae y Tortricidae), 26 géneros y 44 especies. La subfamilia Acentropinae (Crambidae) es la más diversa con 11 géneros y 19 especies para Argentina. La mayor diversidad registrada fueron: el género semiacuático Paracles (Erebidae) con 9 especies registradas y Parapoynx (Crambidae) con 5 especies acuáticas. Se citan por primera vez para Argentina los géneros y especies de: Aulacodes sp. (Guenée, 1854), Argyractoides sp. (Lange, 1956), Oligostigmoides sp. (Lange, 1956), Oxyelophila sp. (Forbes, 1922), Petrophila cronialis (Druce, 1896), Petrophila longipennis (Hampson,1906) y Usingeriessa sp. Lange 1956 (Crambidae). También se brinda una actualización de los géneros de Acentropinae registrados para la región Neotropical y Argentina.