Estrutura de comunidades de aves em dois estuários da APA Costa dos Corais, AL

Abstract

In addition to the avifaunistic community of an ecosystem reflecting its diversity, the richness, composition and biological characteristics of birds allow information on the state of the habitat to be obtained. In this way, the monitoring of the avifauna becomes considerably useful in the evaluation of the environmental quality and of the alterations suffered by the ecosystem, since the decline of the populations of birds provokes negative consequences in the processes of maintenance and restoration of the environments, since these are extremely important. in seed dispersal and propagation, for example. The characterization of the structure of bird communities in forest fragments is an importante factor in the development of programs aimed at the conservation and management of forests. In this sense, it is important to characterize the structure of communities in relation to richness, abundance and frequency of occurrence, describing the structure of the bird community of two estuaries of the Costa dos Corais APA in areas with different anthropic use regimes. The study was carried out in the estuaries of the Manguaba and Santo Antônio rivers in the APA Costa dos Corais, in Alagoas. Previously, three 500-meter long transects were defined in each of the two mangroves, separating them by use regime according to the intensity of use and human disturbance in areas of intense, moderate and sporadic regime. In the Santo Antônio River estuary, 61 different species were recorded, 26.2% of the omnivorous species, 24.6% insectivorous and 59% considered vagrant The species richness for the areas of intense, moderate and sporadic regime of the Santo Antônio River was 42, 37 and 45. Shannon's index was 3.48 and Pielou's evenness was 0.85. Fifty-two species were recorded in the Manguaba River estuary, omnivores (n=16) and insectivores (n=11) were the most common groups. For the areas of intense, moderate and sporadic regime of this river, a species richness of 35, 27 and 34, respectively, was obtained. Shannon's index was 3.45 and Pielou's evenness was 0.87. The study of birds from the estuaries of the Santo Antônio and Manguaba rivers contributed as a sample of the diversity of birds in the region and could serve as a subsidy for the management of the APA Costa dos Corais.