ABSTRACT. The present study aimed to evaluate the composition of mixed-species bird flocks in a fragmented landscape of the Atlantic Forest in southern Brazil. We recorded 117 species in 218 mixed-species flocks. The correspondence analysis showed two distinct groups of fragments according to degree of connectivity with other fragments. The percentage of original cover surrounding a sampled fragment area up to a ratio of 2.5 and 1 km was the variable that presented highest correlation with the formation of different composition of mixed-species bird flocks, followed by altitude. Based on these results, we concluded that, in landscapes with low levels of fragmentation, the composition of mixed flocks reflects the local species pool. Thus, future studies comparing composition of mixed-specie flocks should concentrate their efforts in areas where some of these variables remain constant, as for example where fragments are at similar altitudes.
Occurence of owls (Birds: Strigiformes) in the RPPN Bugerkopf reserve in Blumenau, Santa Catarina. The order Strigiformes is a poorly known group in Brazil, especially in Santa Catarina, and basic surveys of owls in the Atlantic Forests are scarce. The aim of this study was to inventory the owls of RPPN Bugerkopf, a private reserve in Blumenau, Santa Catarina. The study was conducted between February 2005 and May 2006. Fieldwork was carried out during monthly visits, for two to three nights when there was a crescent or full moon, between the hours of 18:00 and 23:00. In a total of 69 study hours, the following species were observed: Tyto alba, Megascops choliba, Megascops sanctaecatarinae, Glaucidium minutissimum, Pulsatrix koeniswaldiana and Asio stygius. The species most frequently detected was G. minutissimum, while M. choliba and P. koeniswaldiana were recorded the least.
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