Demografia de Tangara cayana (Aves: Thraupidae) em um fragmento de restinga no extremo Norte de distribuição da Mata Atlântica
The evolution of life history and its variability between species is a mystery that has attracted researchers for decades. Demographic studies are used to understand a variation of life history traits along latitudinal and altitudinal environmental gradients. However, there are still gaps in informa...
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| Formato: | Dissertação |
| Idioma: | por |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/24061 |
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| Resumo: | The evolution of life history and its variability between species is a mystery that has attracted researchers for decades. Demographic studies are used to understand a variation of life history traits along latitudinal and altitudinal environmental gradients. However, there are still gaps in information about life history traits for species in tropical regions, as well as variables that influence them. Efficient conservation and management programs depend on this type of information. We measured demographic parameters of a tropical Thraupide, Tangara cayana, in the northern end of the Atlantic Forest distribution. We estimated apparent survival, detection, dispersion and population size, also testing how transient individuals, rainfall, and sex of individuals influenced population survival rates. We analyzed capture history of marked individuals in program MARK using Robust Design models. Between November 2010 and November 2014 we marked 127 individuals of T. cayana, from which we could observe a lower annual survival of transients (2% to 4%), followed by juveniles (12% to 34%) and adults (males = 29% to 54%, females = 30% to 55%). The dispersion parameters (y’= 71%, y” = 73%) and detection (capture = 26%, recapture = 5%) were constant, with no temporal variation. Population density was 1.7 individuals/ha. We found a negative relationship between rainfall and survival. The demographic parameters estimated showed low values for a tropical bird, which may be linked to the great capacity of dispersion of the species, leading us to the perspective that these demographic patterns are still unclear, requiring further studies on habitats in these regions. |
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