EFEITO DE BORDA EM REMANESCENTES DE FLORESTA ATLÂNTICA NA BACIA DO RIO TAPACURÁ, PERNAMBUCO RESUMO: Neste trabalho objetivou-se avaliar o efeito de borda sobre o componente arbóreo em dois fragmentos de Floresta Atlântica na Bacia do Rio Tapacurá-PE. Para amostragemdo componente adulto, foram plotadas 15 parcelas de 10 x 25 m e subparcelas de 1 x 25 m para a regeneração. As parcelas foram dispostas em três ambientes, cada uma com cinco unidades amostrais, conforme distância da borda. As comparações entre os ambientes foram realizadas por meio da composição de espécies, Diagrama de Venn e análise de agrupamento. A maior riqueza foi observada na área mais distante da borda e o maior número de indivíduos próximo à borda. Na Mata da Onça, os ambientes mais distantes da borda foram similares, porém são diferentes em composição e em estrutura, quando comparados com o ambiente mais próximo da margem do fragmento. Contudo, na Mata da Buchada, os dois primeiros ambientes próximos à borda foram similares. A interação, entre o ambiente antrópico e o fragmento, causa efeitos sobre a comunidade arbóreas áreas mais limítrofes do fragmento. EDGE EFFECT IN ATLANTIC FOREST REMNANTS IN THE WATERSHED OF THE RIVER TAPACURÁ, PERNAMBUCOABSTRACT: The objective of this study was to evaluate the edge effect on arboreal component of two Atlantic Forest fragments, in the Watershed of Tapacurá River, Pernambuco. For the sampling of the adult component 15 plots of 10 x 25 m were plotted and subplots of 1 x 25 m for the regeneration. The plots were arranged in three environments, with five sampling units each, according to distance from the edge. Comparisons between the environments were performed by specie composition, Venn diagram and cluster analysis. The greatest richness was observed in the area farther from the edge and the greatest number of individuals near the edge. In the Mata da Onça, the farthest edge environments were similar, but different in composition and structure as compared to the nearest environment. However, in the Mata da Buchada the first two environments near to the edge were similar. The interaction between the human environment and the fragment affects the arboreal community in the fragment edges.
The aim of this study was to evaluate the phytosociological structure of an adult woody component in an Atlantic Forest fragment known as Mata da Onça, Municipality of Moreno -PE. Fifteen plots of 10 x 25 m were established, in three rows of five plots 25 m apart, while the rows were 50 m apart. The adult woody individuals with CBH (circumference at 1.30 m above ground level) ≥ 15 cm were identified to the species level, and the diameter and height were measured. 444 individuals belonging to 76 species were sampled, with an estimated density of 1,184 ind.
The objective of this study was to assess the patterns of seed dispersal syndromes of woody plants from nine forest fragments distributed at different altitude levels on the Araripe plateau, in Pernambuco, Brazil. For data collection, we divided the altitudes within the region into three categories: lower level (altitudes ≤600 m); intermediate level (600< altitudes <750 m); and higher level (altitudes ≥750 m). We registered nine fragments, three per altitude level. In each of them, we distributed 20 rectangular sampling units with 250 m², totaling a sampling area of 4.5 ha. We quantified, collected, and identified woody plants with a diameter at breast height higher than or equal to 0.1 m (DBH 1.30 m ≥0.10 m). We characterized the dispersal syndrome according to the characteristics of the fruits and seeds and based on a literature review. In the whole region, we sampled 6,987 individuals, distributed in 35 families, 82 genera, and 153 species. Approximately 41% of all individuals are dispersed by animals, 37% by the plant’s own mechanisms, and 21% by the wind. In terms of dispersal, 47% of species were classified as zoochorous, 23% as autochorous, and 14% as anemochorous. Seed dispersal patterns vary according to altitude levels, with higher regions tending to present greater representativeness of biotic dispersers and lower ones, abiotic.
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