![]() Alpha and beta diversity showed that ecoregional spider communities were different, sharing few species (0.7 %). The Chaco ecoregion (S = 56, N = 495) reported the highest species richness and abundance compared to Monte (S = 44, N = 262) and Puna (S = 23, N = 129). The completeness of the inventory obtained for each ecoregion surpassed 70 %. A total of 886 spiders were collected from 100 species/morphospecies of 19 families. In each site, 10 pitfall traps, located along a linear transect and 10 meters apart, were placed for seven days per season of continuous activity. For this, we analyzed the alpha and beta diversity of the epigeal spider communities in three separate sites of three ecoregions of Salta province (Chaco Serrano, Monte de Sierras and Bolsones, and Puna), during the fall, winter, spring and summer of 2005-2007. Generally, spiders are used as indicators to compare biodiversity patterns, and here we tested whether the spider family-level can act as a substitute of the species-level in biodiversity rapid assessments. Particularly, the study of the spider fauna in the North of Argentina is scarce in ecoregions with priority interests of conservation. The increased degradation of natural habitats has strengthened the need to know and assess biodiversity patterns. Efficiency of pitfall traps and taxonomic sufficiency for epigeal spider communities (Araneae) in three ecoregions of northwestern Argentina. CRUZ, Ivanna Gabriela TORRES, Victor Manuel GONZALEZ-REYES, Andrea Ximena e CORRONCA, José Antonio.
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