Vegetação e arquitetura das espécies de restinga associadas à ocorrência de Formicivora littoralis (Aves,Thamnophilidae)

• Autor(a) principal: Cavalcanti, Adriana Carvalho de Sá
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/7943
• topic: Conservation; Diversity; Complex structure; Restinga; Conservação; Diversidade; Estrutura complexa; Restinga; Ave; Vegetação; Restinga de Marambaia (RJ); CNPQ::CIENCIAS BIOLOGICAS::BOTANICA

This study aimed to increase the knowledge of the floristic composition, vegetation structure and species architecture at the low ridge thicket formation, associated with foraging tactics, nesting and local abundance of Formicivora littoralis. This bird is endangered and endemic from coastal beach-ridge vegetation (i.e. restinga). Although, the vegetation s of F. littoralis habitat is very unknown, mainly those areas with highest densities of this bird at the low ridge thicket formation (i.e. AFP), located in a center of plant diversity (i.e. CDV). The study was conducted in two sites on Massambaba restinga, municipality of Araruama and Arraial do Cabo, Rio de Janeiro, Brazil. Trips were made monthly totaling 60 days of field work with plants randomly collected all over the AFP, and 20 plots of 2X50 m (0.2 ha) were built perpendicular to the sea, where the individuals sampled has with Breast height diameter and Soil Height Diameter ≥ 2.5, in addition individual were categorized in branches architecture. The floristic survey resulted in 160 species collected, in which at least 12 plant species under threat, including the Salicaceae (Casearia sessiliflora) rediscovered. Orchidaceae, Myrtaceae and Leguminosae were the richest families. 75% more species were added in the preliminary list of AFP in Massambaba, in addition to 14 new records to the CDV of Cabo Frio. In structure and architecture have been analyzed 58 species of 906. The highest importance values were Pilosocereus arrabidae (42.30) and Chrysophyllum lucentifolium (23.45). Shannon diversity index was 3.46 and evenness was 0.85. The architecture of most individuals was complex, 58% of individuals have multiple branches and in general the species did not present a unique architectural pattern of branching. The local density of F. littoralis in this formation was high, with 172 ind/km2. Results had indicated that the architecture of the the low ridge thicket formation has influences in the bird ecology. This bird species was generalist on choosing plants for nesting and foraging, but it had selected thin branches and near the horizontal angle. The abundance of F. littoralis was positively correlated to plant diversity, but was negatively correlated to the height of vegetation. These are important features considering the fisionomy of AFP. The high rate of zoochory plants indicates the importance of this vegetation in the provision of food resources for wildlife, in addition, this resource is indirectly interesting for the bird, because attract small arthropods that are part of the diet of F. littoralis.