Estrutura, diversidade e dispersão em Floresta Ombrófila Densa no Sul da Bahia, Brasil / Structure, diversity and dispersal of Dense Ombrophylous Forest at South of Bahia State, Brazil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The present study aimed to investigate the contribution of a primary remaining forest to biodiversity preservation face its comparison to a secondary forest; add information on Dense Ombrophylous Lowlands Forests at the south of Bahia State, Brazil, Atlantic forest; investigate the importance of zoochoric dispersion during the succession process in two tropical rain forest patches and compare a primary forest patch with a secondary forest fragment containing the same typology. The reserve areas were denominated Reserva da Fazenda Palhal (secondary fragment) and Reserva Sombra da Tarde (primary fragment), located at the company CAF Santa Bárbara Ltda.- Arcelor Group, at the municipalities of Prado and Alcobaça, Bahia, Brazil. The rising was made by a grid of quadrats, in 0.5 ha per area, minimum DBH of 5 cm to 1.3 m from the soil. The species found were separated in two groups (zoochoric and non-zoochoric). The proportion of species and individuals was analyzed for each area, and according to the dispersion type for diameter class center. A V2 test was used to analyze differences among samples related to the total number of species for dispersion type, as well as to test differences among the areas according frequencies distribution of the species (zoochorics and non- oochorics), for diameter classer. A total of 495 individuals, 25 families and 55 species were sampled in the secondary forest, against 934 individuals, 50 families and 226 species in the primary forest. Both areas differed in all structural parameters, as well as in the number of individuals that were distributed by classes of diameter center. Species richness and diversity indexes were also different. The Reserva da Fazenda Palhal presented two species on the list of threatened of extinction species while Reserva Sombra da Tarde presented twelve species on the list of threatened of extinction species and six endemic species, from which two were also included on the list of threatened of extinction species. Inga exfoliata T.D. Penn. &F.C.P. Garcia had the second register of occurrence and the first for the State of Bahia. Zoochoric are more important than non-zoochoric species during the succession process in both reserve areas (richness and abundance). The fragments did not differ when compared to the proportions of dispersion types for individuals and species number. Frequencies distributions of species and individuals in the diameter classes among the reserve areas also did not present differences according to the V2 test at 5% of probability for each dispersion type.

ASSUNTO(S)

dense ombrophylous forest succession ecologia de ecossistemas dispersal sucessão floresta ombrófila densa dispersão structure estrutura

ACESSO AO ARTIGO

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