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Idesia (Arica)

versión On-line ISSN 0718-3429

Resumen

FERRU, Marcos  y  FIERRO, Pablo. Structure of aquatic macroinvertebrates and trophic functional groups in the basin of Lluta river Atacama Desert, Arica y Parinacota, Chile. Idesia [online]. 2015, vol.33, n.4, pp.47-54. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292015000400007.

The aim of this study was to determine the community structure of freshwater macroinvertebrates and characterize trophic functional groups in the Lluta river basin located in the Atacama Desert. To this was sampled with Surber sampling in 12 stations, in extension from the source to its mouth on the coast during November 2011. In this study 66 taxa of macroinvertebrates were recorded, corresponding mostly insect larvae (46). The groups with the greatest wealth were Diptera (20 taxa), Coleoptera and Trichoptera (both with 7 taxa). On abundance, Chironomidae was the most abundant family of the study area. The group of collectors-gatherers was the most representative in 10 of the 12 stations, while the group of browsers dominated the two closest stations to the mouth. Our results are the first to describe the fauna of macroinvertebrates dulceacuáticos in extreme northern Chile basin, containing a much higher than other rich fauna desert basins. Besides the great representative of the collectors-gatherers that feed on organic fragments under 1 mm deposited on the bottom, showing the importance of this food source in the Atacama desert rivers.

Palabras clave : Aquatics macroinvertebrates; trophic funtional groups; Atacama; Lluta river; Chile.

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