Distribución altitudinal de especies de Trichoptera en un sistema fluvial en Patagonia
Abstract
Altitudinal zonation studies of Trichoptera species carried out in lotic environments of temperate zones of the Northern Hemisphere, suggest that their diversity and distribution is mostly determined by thermal change as function of the altitude. The objective of this work was to analyse, during a complete annual cycle, distribution patterns of the species of caddis flies in a mountain fluvial system in Patagonia. The system exhibited a 1000 m gradient of height and in the middle was affected by waste discharges. Seventeen species of Trichoptera were identified. Smicridea sp., Mastigoptila longicornuta, Parasericostoma ovale, Neoatopsyche sp., Brachisetodes major y Cailloma sp. were the more extensive distributed species, while the other species had more localised records. The most abundant species were Smicridea sp. and Parasericostoma ovale. Correlation coefficients were obtained between density species and environmental factors after that Canonical correspondence analysis was performed. Environmental variables explained the variability of the species partially. All trophic guilds were recorded, that suggest exploitation of different resources to diminish the interespecific competition. This last and the environmental heterogeneity could be explaining the high specific richness found.
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