Diversidad y patrones de distribución geográfica de insectos coleópteros en ecosistemas desérticos de la región de Antofagasta, Chile Diversity and geographic distribution patterns of coleopteran insects in desert ecosystems of the Antofagasta region, Chile

2000; Linguagem: Inglês

Autores

Viviane Jerez,

Tópico(s)

Plant Taxonomy and Phylogenetics

Resumo

The coleopterologic fauna ofthe Antofagasta Region has been the object of di verse studies, but until now, an analysis ofboth the diversity and spatial distribution ofthe species was lacking. In this paper, the diversity of coleopteran species and theirdistributionranges are given. The possible biogeographic relationships which could exist between the different described ecosystems of the region were analyzed. In this analysis, a coleopteran species inventory was elaborated based u pon the literatme, collected material from museums, and observations from field work. The spatial distribution of the taxa was established in relation to 11 described ecosystems for the Region and the endemic areas were determined using a biogeographic parsimony analysis. The taxonomic composition of Coleoptera is comprised of 21 families, 86 genera, and 167 species, with Tenebrionidae as the most diverse having 23 genera and 78 species. The Subdesertic steppe of the puna (57 sp.), Coastal desert ofTocopilla (50 sp.), Desert of Atacama saltflat (35 sp.), Coastal desert of Taltal (32 sp.), Aluvian Desert (22 sp.), and the Shrubery steppe (17 sp.) are the ecosystems that present the most diversification. However, the Coastal desert of Tocopilla (72% ), Coastal desert ofTaltal (62.5% ), Subdesertic steppe of the puna (55.8% ), Desert of Atacama saltflat (51.4% ), Shrubery steppe (47% ), and the Aluvian desert (36.3%) ha ve the highest percentages of endemism. Three areas of endemism are defined for the Region of Antofagasta, which correspond to three ecosystems distributed in an altitudinal gradient: Coastal desert, Aluvian desert, and Tropical zone.

Referência(s)