Small mammals in the diet of barn owls (Tyto alba) in agroecosystems of southern Brazil

We studied the diet of the Barn Owl (Tyto alba) in an agricultural area of southern Brazil (29degrees36'S, 52degrees11'W), based on analysis of regurgitated remains. The results clearly showed that the diet of the Barn Owl reflects the human impact on its habitat. The cosmopolitan house mouse (Mus musculus) was the most preyed upon small mammal (81.9%) and the most important in terms of the Barn Owl ingested biomass (69%). This rodent, due to its small size, is also responsible for the relatively low me-an weight off small mammal prey in the owl diet (19.6 g). In southern Brazilian agroecosystems, the Barn Owl probably feeds mainly on mice due to their great abundance in crop fields and grain storage areas of the region.

Procedimento numérico para análise de vigas de alvenaria estrutural submetidas à flexão simples

Pós-graduação em Engenharia Civil - FEIS

Fronteiras nas Américas: tamanho e composição dos domicílios rurais no oeste do Brasil e EUA na primeira metade do século XIX

The study of the size and composition of the rural household in tradicional societies in transition to modern ones is very useful as a tool in order to understand forms and organizations of the domestic groups and their possibilities of survival, social mobility e developing strategies of material accumulation. The aim of this article is to compare the size and composition of the rural households in the frontier regions of the Americas: the northwest and southwest of U.S.A with the southwest of São Paulo province in Brazil. The findings are surprising in comparative perspective, as the mean size of the American households were very high in relation to the brazilian ones. The sources used in this research are the manuscript census of the U.S.A and Brazil.