Efeitos da fragmentação florestal em leques de Corapipo gutturalis (Aves: Pipridae) em uma paisagem da Amazônia Central
Effect of forest fragmentation on the leks of Corapipo gutturalis. Forest loss and landscape transformation into a mosaic of forest fragments may not only cause reduction in species richness and abundance, but also may lead to changes in behavior and patterns of habitat use within the landscape. Cor...
| Autor principal: | Silva, Mariana Tolentino Bento da |
|---|---|
| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
|
| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11866 http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4121209Z4 |
| Resumo: |
|---|
|
Effect of forest fragmentation on the leks of Corapipo gutturalis. Forest loss and landscape transformation into a mosaic of forest fragments may not only cause reduction in species richness and abundance, but also may lead to changes in behavior and patterns of habitat use within the landscape. Corapipo gutturalis is a passerine bird in the family Pipridae, and presents lek breeding system, in which males use fallen logs for displays. The species is quite common in forests within a fragmented landscape near Manaus, in Central Brazilian Amazon (02°30 S; 60°45 W), but there has been no account of individuals and leks in forests of varying sizes, and nothing is known about its activity pattern within these areas. Here we address whether the pattern of leks utilization by C. gutturalis is affected by forest fragmentation. The study was carried out on 11 areas (four of 1 ha, three of 10 ha, two of 100 ha and two continuous forests, where a plot of 100 ha was sampled. Display logs were marked and georreferenced from previous studies and direct search. Individuals were captured and marked within leks. We made direct observations to record display rates and the number individuals attending logs and leks. We tested the effect of landscape metrics (distance to the edge and to the nearest continuous forests) and lek system metrics (distance to the closest logs and leks) using multiple model comparison with GLMM functions, and ranked models by likelihood using the Akaike information criterion, corrected for small samples (AICc). We included lek identity as a random variable and used a hypothetical constant variable for the null model. We found 24 display sites, out of which 21 were sampled with mist nets and 19 through direct observations. We did not find display logs in fragments of one ha. We found variation in the number of individuals and display rate among logs of different leks but were not associated to the measured explanatory variables. In fact, the null model was the best for explaining variations in population and behavioral indices in our study. These results show that if there is enough forest area for lek, the individuals will present similar behavioral patterns and population indices, regardless of landscape metrics. Therefore, the same natural variation observed among leks in pristine habitats will be observed among leks in changed the landscape |