Mapeamento e caracterização dos fragmentos florestais da bacia do baixo rio São Francisco em Sergipe e suas implicações a para conservação de guigós (Callicebus sp.)

• Autor(a) principal: Santos Junior, Eduardo Marques
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFS
• Texto Completo: https://ri.ufs.br/handle/riufs/4432
• topic: Conservação; Ecologia; Fragmentação; Paisagem; Callicebus sp.; Conservation; Ecology; Habitat fragmentation; Landscape; Callicebus sp.; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::CONSERVACAO DA NATUREZA

The assessment of the geographic distribution of organisms in fragmented landscapes is one of the principal approaches of Conservation Biology, due to the extensive loss of natural habitats, both in overall quantity and quality (habitat fragmentation). In the Brazilian state of Sergipe, the surviving remnants of the forested habitats of the Atlantic Forest and Caatinga biomes support an important diversity of organisms. Given this, the objective of the present study was the quantification and characterization of the forest fragments of the lower Rio São Francisco basin (LSF) in Sergipe, with regard to the size, form, and distribution of fragments from the viewpoint of the conservation of local populations of titi monkeys (Callicebus sp.). This assessment was based on geoprocessing techniques, which were used to map the study area using the programs SPRING 5.1.4 and ENVI 4.3 for the analysis of satellite images in order to estimate the number of fragments within the study area and their characteristics (size, shape, perimeter). A total of 5453 fragments were identified in the LSF, with a total area of 73,850.70 hectares, approximately 10.9% of the 679,210.30 ha of the study area. The program Patch Analyst 4 defined mean fragment size as 13.54±72.14 ha, although only 560 fragments were larger than 20 hectares. The mean and weighted shapes indices (MSI = 2.55 and AWMSI = 3.68) indicated a tendency towards highly irregular fragment shapes (ideal value = 1 for both indices) characterized by a high proportion of edge habitat. Titi monkey populations were surveyed at 67 sites using the playback technique. A total of 15 populations were identified, 13 at new localities. These populations are concentrated in three sub-basins of the LSF those of the Betume, Capivara, and Curituba rivers. The total area occupied by titis was 2,660.10 ha, with occupied fragments varying in size from 2.63 to 1,069.0 hectares. By logistic regression analysis was performed as the program Spatial Analysis in Macroecology (SAM) was able to verify that the features of the landscape and the position does not determine the presence / absence of outriggers in these fragments (p = 0.4962 > 0.05). These findings are extremely important for the long-term planning of conservation and management strategies in the study area, not only for Callicebus, but the ecosystems as a whole.