Aspectos populacionais de Sterculia apetala (Jacq.) Karst (Sterculiaceae) como subsídios ao plano de conservação da arara-azul no Sul do Pantanal, Mato Grosso do Sul, Brasil.

AUTOR(ES)

Antonio dos Santos Júnior

DATA DE PUBLICAÇÃO

2006

RESUMO

Sterculia apetala is a key-species for the conservation of the Hyacinth macaw (Anodorhynchus hyacinthinus) in the Pantanal, for 94% of this birds nests occur in the branches of this tree. The main objectives of this study were (1) to investigate the existence of the tree rings by describing the macroscopic anatomical characteristics of the wood, (2) to investigate the annual growth rate, (3) to estimate the age of the trees with nests studied by the Projeto Arara Azul/UNIDERP and (4) to provide information for studies on population structure of Sterculia apetala and the conservation planning of the Hyacinth macaw in the Pantanal. The study was carried out in non-inundable semi-deciduous forests in corridors (cordilheiras) in three regions of the Pantanal of Miranda, Abobral and Nhecolândia, using dendrochronological methods. The growth rings of Sterculia apetala showed to be distinct and annual with an increment rate of 3,4 mm. The growth rhythm of Sterculia apetala suggests that this species is a fast-growing emergent tree of secondary succession that firstly invests in height and then, in diametral increment. The population structure of Sterculia apetala showed a low frequency of young individuals both in age and size structure. The most part of nests studied by the Projeto Arara Azul occurs in adult trees of 60-90 years old. Considering the age of the trees with cavities/nests and its constant loss there is a tendency in decreasing number of natural nests for the Hyacinth macaw in the next decades, making them dependent of artificial nests. Therefore, in case of forest replacement only after 60 years these trees will be able to offer cavities for the Hyacinth macaws nestings. Thus, management actions as the ones conducted by the Projeto Arara Azul will be important for the conservation of the Hyacinth macaws in the Pantanal.

ASSUNTO(S)

manduvi arara azul pantanal sterculiaceae conservação ecologia

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