2020 Boletín de la Sociedad Zoológica del Uruguay  
In previous studies, Uruguay has been considered a biogeographical crossroads. Paso Centurión and Sierra de Ríos in eastern Uruguay were recently entered into the National System of Protected Areas. The landscape is characterized by a mosaic of different ecosystems located in one of the dendrofloristic hotspots proposed for the country. The spiders constitute a megadiverse group useful for the monitoring of natural environments. The aim of this study was to know the composition and structure of
more » ... on and structure of the spider fauna of this protected area. The sampling of spiders was carried out in two different environments (ravine and riparian forests) and three methods were used: ground vacuum, foliage beating and manual collection. A greater richness of spider families, species and guilds was recorded compared to previous studies in other protected areas from Uruguay. The two environments showed differences in taxonomic composition and species replacement. Araneidae, Theridiidae and Salticidae represented the families with the highest species richness. The family Symphytognathidae and 55 species are new records for the country. The finding of more southern records for several species confirm that the area is located in a border zone with other biogeographic units at regional level. This fact supports the crossroads condition for the country, provides key information for the management of the area and increases the number of priority spider species for conservation in Uruguay.
doi:10.26462/29.2.4 fatcat:ilajqfgedval7cei75t3jl5n7i