Detalhes bibliográficos
| Ano de defesa: |
2013 |
| Autor(a) principal: |
Carvalho, Eduardo Bruno
 |
| Orientador(a): |
Melo, Fabiano Rodrigues de
|
| Banca de defesa: |
Melo, Fabiano Rodrigues de,
Silva, Daniel de Brito Cândido da,
Machado, Ricardo Bonfim |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal de Goiás
|
| Programa de Pós-Graduação: |
Programa de Pós-graduação em Ecologia e Evolução (ICB)
|
| Departamento: |
Instituto de Ciências Biológicas - ICB (RG)
|
| País: |
Brasil
|
| Palavras-chave em Português: |
|
| Palavras-chave em Inglês: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
http://repositorio.bc.ufg.br/tede/handle/tede/11307
|
Resumo: |
Fragmentation is one of the main causes for species extinctions, yet the responses to fragmentation may vary and have specific mechanisms related to species habits. Herein we hypothesized that generalist species occupancy and detectability are favored in fragmented areas and specialists species are damaged and that specialist’s activity patterns are altered as a way of compensating for the effects of fragmentation. This study included seven areas along the Araguaia River Biodiversity Corridor, which is embedded in the Cerrado Biome. We utilized data from camera trapping of six ungulate species: Mazama americana, Mazama gouazoubira, Pecari tajacu, Tapirus terrestris, Tayassu pecari e Ozotoceros bezoarticus. We created three hexagonal grids, measuring 50, 500 and 5.000 hectares, wich were related to the species home ranges. The fragmentation status was evaluated inside each grid by four landscape metrics wich were later redeced to a single variable by a Principal Components Analysis. Specie’s occupancy and detectability were tested by model selection to verify changes under influence of fragmentation. Frequency of records alterations between periods of the day were tested by a linear mixed-model analysis. The hypothesis of the positive effect of fragmentation on generalists specie’s occupancy and detection could not be confirmed, nevertheless fragmentation had an effect on every species, even when it was contrary to our initial prediction. None of the species presented shifts on the frequency of records among periods of the day due to fragmentation, however most of the species didn’t exhibit the expected pattern of activity described on the literature. These results could be attributed to the simplistic classification of the Cerrado, which didn’t comprise all of it’s different phytophisiognomies, to the narrow classification of fragmentation status and to the poor knowledge of how species respond to the fragmentation. |
