Spacial distribution of an assembly of birds in the Pampa bioma

The pampa biome has suffered changes due to the replacement of native fields by monocultures. In the Campus São Gabriel of the Universidade Federal do Pampa, besides the changes in vegetation, the expansion of the built areas is occurring. The objective of this work is to compare the richness of birds and their distribution within the different environments of the Campus. The survey occurred between May 2015 and April 2016, with weekly morning and afternoon observations. The environments sampled were: ciliary vegetation, silviculture, woody field and clean field. We reached an n=127 species. The similarity for richness among the environments was compared through Cluster analysis. We got four big groups. Group one is composed of three types of environment: shrub field, clean field and ciliary vegetation, being segregated from the others by four species that appeared only in this group. Group one is similar to group two, composed of ciliary vegetation and segregated by five species that appeared only at this sampling point. Group three (silviculture) segregated the other two groups by 13 species that appeared exclusively in this environment. Group four is composed of ciliary vegetation and built areas and was isolated by two species. We obtained 27 generalist species, appearing in all sampled environments. We conclude that the homogeneity of the environments of group one interfered in their agglomeration, while the others were separated more specifically by type of environment and human presence, because some species do not tolerate this presence, while others benefit from it.