Fragmentos florestais e suas implicações na assimetria flutuante e na estrutura da avifauna

Abstract

Anthropogenic actions advance every day, so it is important to know its implications and influence over the animals. Birds are organisms that are very sensitive to variations in the environment and respond very well to these variations, but even so, little is known about the individual responses from these animals. Floating asymmetry is a subtle drift of symmetry, and is used as an environmental monitoring tool. In this survey, the species of birds, the trophic guilds and the habitat use of them and their responses in an anthropic area were evaluated, using their floating asymmetry expressed. Since birds have quick responses to the environment, we also sought to understand how anthropic effects organize the distribution of birds in the environment. For this, environmental variables were collected that could characterize the environment where the birds meet. The results revealed sensitivity patterns of the different bird species, and they were more sensitive than the other clusters to this bioindicator. But the guild of the nectarivores were more sensitive than the other guilds to this environment. The results also indicate that the tarsus of the birds presented higher sensitivity. The responses of the birds to the anthropic effects were soon evident, showing a pattern of homogenization of the environment, since the analysis of indicator species found 11 species with a degree of threat while the others were species usually found in surveys about birds. This view can bring more information about birds, as well as their responses to the environment. Moreover, it was possible to find a new record for the state of Pernambuco, the owl caburé-canela Aegolius harrisi, despite degraded and quite anthropized environments. It demonstrate the relevance of the small remnants of natural habitat.