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| Author(s): |
Leandro Claudio Baumgarten
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Biologia |
| Defense date: | 2007-11-27 |
| Examining board members: |
Wesley Rodrigues Silva;
Luiz Fabio Silveira;
Emerson Monteiro Vieira;
José Carlos Motta Junior;
Ricardo Bomfim Machado
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| Advisor: | Wesley Rodrigues Silva |
| Abstract | |
Birds of prey are poorly studied in Brazil, and there is few information on patterns of population dynamics of species occurring in the country, as well as factor influencing them. We sample bird of prey and small mammals populations for 36 months aiming to describe raptor population dynamics and how it is influenced by prey abundance in Emas National Park (Mineiros - GO). Furthermore, we collect data on prey daily activity patterns to evaluate their availability for predators. Prey monitoring was performed in nine trapping sites, each one with 24 pitfall traps, raptor sampling was evaluated using car census. We did 12 one-month fieldtrips with two months apart. We did not detected abundance variation among years for any raptor species, although most of them showed seasonal fluctuations. Data gathered suggests these population changes were caused mostly by movements to and from the reserve. We did not find any seasonal fluctuations of small mammals, but we record a major increase of abundance for three of the commonest species. The most abundant species, Bolomys lasiurus, showed different population dynamics among trapping sites. We did no detected numerical response of birds of prey in Emas National Park along this three-year sampling. We compare these data with other studies available, and we suggest that sampling performed in larger areas would hardly detect predatory responses, because it would not be able to discern small local concentrations of raptors caused by increase in prey availability (AU) | |