Fatores locais e da estrutura da paisagem não influenciam ocorrência de tatus simpátricos no Pantanal, Brasil

• Autor(a) principal: Bueso, Maria Fernanda Flores [UNESP]
• Data de Publicação: 2019
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/203304; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2020-02-27/000927522.pdf
• topic: Ecologia da paisagem; Paisagens fragmentadas; Habitat (Ecologia); Xenarthra; Tatus; Animais silvestres; Dasypus; Ecologia; Conservação da natureza; Pantanal da Nhecolândia (MS); Pantanal Mato-grossense (MS e MT); Brasil

For decades, habitat fragmentation has been considered as one of the main causes of biodiversity decline. However, in spite of the direct loss of habitat, forest fragmentation also generates environmental heterogeneity, being able to influence the occurrence of species in the landscape. In this study, we sought to identify the variables that influence the occurrence of two sympatric armadillos (Euphractus sexcinctus and Dasypus novemcinctus) at both local and landscape scales. With this we can provide knowledge about the ecology of these species and encourage future conservation efforts. We selected 47 sampling stations, distributed in the Nhecolândia Pantanal, Mato Grosso do Sul, Brazil. Sampling of occurrences of species was done by photographic trapping. For each site, three local environmental variables were collected: abundance of acuri palm (Attalea phalerata), bromeliad caraguatá (Bromelia antiacantha) and shrub vegetation. We also calculated three metrics of the landscape structure: forest cover, border area and landscape heterogeneity. Landscape metrics used a multi-scale approach and were calculated in LS Metrics software. After analysis of the collinearity between explanatory variables, we selected those less correlated to generate the models of occurrence. The best models to explain the patterns were selected using the ΔAIC values. We detected D. novemcinctus in 31% of the stations, while E. sexcinctus was detected in 27% of the sampling stations. The occurrence of these species showed no relation with local variables and landscape metrics. This allows three possible understandings: (1) the local and landscape factors considered are not important to explain the occurrence of these species; (2) habitat quality in the study area is high, so that these species are not affected by specific local or landscape factors