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This is the first study based on a planned and intensive sampling effort that describes the community composition and structure of the ground-dwelling arthropod assemblage of Península Valdés (Patagonia). It was carried out using pitfall traps, opened for two weeks during the summers of 2005, 2006 and 2007. A total of 28, 111 individuals were caught. Ants (Hymenoptera: Formicidae) dominated this community, followed by beetles (Coleoptera) and spiders (Araneae). The most abundant species were  Pheidole bergi  Mayr (Hymenoptera: Formicidae) and  Blapstinus punctulatus  Solier (Coleoptera: Tenebrionidae). Two new species were very recently described as new based on specimens collected during this study:  Valdesiana curiosa  Carpintero, Dellapé & Cheli (Hemiptera, Miridae) and  Anomaloptera patagonica  Dellapé & Cheli (Hemiptera, Oxycarenidae). The order Coleoptera was the most diverse taxa. The distribution of abundance data was best described by the logarithmic series model both at the family and species levels, suggesting that ecological relationships in this community could be controlled by a few factors. The community was dominated by predators from a trophic perspective. This suggests that predation acts as an important factor driving the distribution and abundances of surface-dwelling arthropods in this habitat and as such serves as a key element in understanding desert, above-ground community structure. These findings may also be useful for management and conservation purposes in arid Patagonia.

The Ground-Dwelling Arthropod Community of Península Valdés in Patagonia, Argentina