Pasture and crop lands restrict seed dispersal near remnant forest fragments, especially by restricting the movements of dispersal agents and limiting propagule dispersal. Some factors can improve seed dispersal in open areas, such as the presence of high numbers of isolated trees in close proximity to forest fragments. We sought to determine if: (i) the structural characteristics and (ii) densities of isolated trees in pasture lands, and (iii) their distances from the forest fragments, infl uence seed dispersal. We installed 18 seed traps in each of six pastures (total=108 traps) bordering forest fragments distributed over 6 distance classes from the forest edges (0, 5, 10, 20, 40 and 80 m). We determined the characteristics of the plants surrounding the traps. GLM and GLMer analyses were performed and the best model was selected by AIC. We collected 8162 seeds (4722 anemochorous, 3304 epizoochorous, 72 autochorous, and 64 endozoochorous) belonging to 26 species. Our results showed that plants with high crown coverage close to forest fragments and at high densities in the pastures increased seed dispersal. Th ese results may aid future restoration of pasture lands by improving seed dispersal in this harsh habitat and promoting better connectivity between forest fragments.
Este trabalho teve como objetivo verificar a influência de fatores ambientais nas variações estruturais da regeneração de dois fragmentos de mata seca em Montes Claros (MG). Foram alocadas 26 parcelas de 25 m2, amostrando-se árvores regenerantes (DAS > 1 cm e DAP < 5 cm) e variáveis ambientais (propriedades químicas, texturais e de umidade do solo, feições topográficas e rochosidade). Além disso, foi realizada uma classificação da ocorrência das espécies no estado. Os dados apontaram grande dessemelhança entre os fragmentos quanto aos parâmetros estruturais e de diversidade florística. Os contrastes podem estar relacionados as diferenças na disponibilidade da saturação de bases, argila e umidade e da topografia (cota). Quanto a ocorrência das espécies, verificou-se que 26,1% são raras, sugerindo que os fragmentos ainda abrigam elevada diversidade. Assim, pode-se sugerir para os fragmentos estudados que as características ambientais exerceram influência nos padrões florístico-estruturais e na distribuição das espécies nestes locais.
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