Demografia de canário-do-mato (Basileuterus flaveolus) em áreas de cerrado: variações espaço-dependentes

Abstract

Populations are distributed spatially heterogeneous landscapes, being affected by environmental factors that vary over time and space. The diversity of environmental conditions can influence the population dynamics of living beings, thus determining the persistence and regulation of these populations in different regions or parts of a landscape. Little is known about the demographics of tropical birds and what factors that regulate their population due to lack of long-term studies in the region. We use capture and recapture data of ten years (2001 to 2011), to estimates the demographic parameters of Basileuterus flaveolus and assess the importance of spatial variables in local and regional scales related. We analyze, specifically, the effects of different vegetation types and locations of the Cerrado of Brazil, in apparent annual survival (), population growth ( ) and also, the probability of Seniority () of Basileuterus flaveolus. Our most parsimonious models indicated that the apparent annual survival e population growth of Basileuterus flaveolus not vary spatially. Counter position, a second model indicated that may have varied between vegetation types, being negative in the forests and positive in the cerrado. Even with these possible variations, the demographics of Basileuterus flaveolus suggest that its population is in equilibrium in the different sampling sites. The differences in population growth between vegetation types generated growth locally null. The probability of Seniority indicated that is more sensitive to changes in survival than the recruitment, however the temporal variations of some recruitments components may be determined fluctuations size population of B. flaveolus between environments.