Pichorim, MauroCosta Neto, Paulo Fernandes da2018-07-092018-07-092018-02-28COSTA NETO, Paulo Fernandes da. Padrões de uso de habitat e coocorrência de aves do gênero Herpsilochmus (Thamnophilidae) em fragmento florestal no extremo Norte de distribuição da Mata Atlântica. 2018. 49f. Dissertação (Mestrado em Ecologia) - Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 2018.https://repositorio.ufrn.br/jspui/handle/123456789/25542The bird distribution in the environment is modulated by habitat complexity and seasonal changes in resource availability, characteristics whose understanding is essential for accurate inferences about how species use the habitat. In addition, interspecific interactions also affect the distribution and the way in which the species use the habitat and may be an important factor to understand the coexistence, especially between congeneric species. Here, we used occupancy models for one and two species to investigate how vegetation structure and interspecific interactions affect patterns of habitat use and co-occurrence in three sympatric species of the genus Herpsilochmus (H. atricapillus, H. pectoralis and H. rufimarginatus). The study was carried out in a forest remnant at the northern portion of the Atlantic Forest distribution, northeastern Brazil. For this, we performed point-count surveys in 80 sample units, in the dry and rainy season, and collected variables related to the vegetation structure. From this we created sets of occupancy and co-occurrence models and selected the most parcimonious model for each species and species pairs. As main results of the occupancy models we found that H. atricapillus and H. pectoralis had higher occupancy rates (Ѱ = 0,37 ± 0,07 to Ѱ = 0,67 ± 0,07) when compared to H. rufimarginatus (Ѱ = 0,34 ± 0,05 to Ѱ = 0,46 ± 0,05). The density of trees positively affected the occupancy of H. pectoralis, while H. atricapillus and H. rufimarginatus were positively affected by tree diameter. Detection probabilities were moderated among species (p = 0,57 ± 0,04 to p = 0,76 ± 0,05). Co-occurrence models showed that the presence of H. pectoralis is related to a decrease in H. rufimarginatus occupancy. The results indicate that the occupancy pattern of H. pectoralis and H. rufimarginatus seems to be influenced by avoidance among species which associated to micro-habitat preferences are facilitating coexistence. In contrast, H. rufimarginatus and H. atricapillus seem to use basically the same habitat types, then higher levels of specialization as different prey preferences may be important factors for coexistence between species.Acesso AbertoHeterogeneidade ambientalSobreposição de nichoEspécies sintópicasFatores ambientaisSegregação de habitatmasterThesisCNPQ::CIENCIAS BIOLOGICAS::ECOLOGIA