Spatial patterns of two co-occurring savanna and forest tree species in a dense fire-protected savanna fragment
AUTOR(ES)
Costa, Rafael Carvalho da, Santos, Flavio Antonio Maës dos
FONTE
Acta Bot. Bras.
DATA DE PUBLICAÇÃO
10/11/2016
RESUMO
ABSTRACT Savanna-forest transition under fire-exclusion could be explained by differential competitive performance of savanna and forest species under shading/fire-exclusion. Aiming to understand strategies related to either habitat affinity, we investigated spatial patterns of a savanna and a forest species in a fire-protected savanna. We predicted that: savanna species would have lower abundance than the forest species due to a restriction in the number of open microsites; segregation of size classes and a trend from clumping to regularity with size for forest species due to absence of microsite limitation and intra-specifc competition; and spatial association and increasing clustering with size for savanna species due to microsite limitation. To test these predictions, we described spatial patterns of plants in two size classes in three plots of 0.5 ha. We analyzed spatial patterns and associations of size classes using SADIE methodology. Different from what we expected, both species were more abundant among the studied plots and exhibited an increasing aggregation from small to large size classes. We also found a positive spatial association between size classes of both. These results suggest that both savanna and forest species produce similar spatial patterns independently of habitat affinity. We discuss the possible processes responsible for the observed patterns.
Documentos Relacionados
- Spatial-temporal distribution of fire-protected savanna physiognomies in Southeastern Brazil
- Early Identification of Co-Occurring Pain, Depression and Anxiety
- Distinct population structure for co-occurring Anopheles goeldii and Anopheles triannulatus in Amazonian Brazil
- Latent class profile of psychiatric symptoms and treatment utilization in a sample of patients with co-occurring disorders
- Contrasting bee pollination in two co-occurring distylic species of Cordia (Cordiaceae, Boraginales) in the Brazilian semi-arid Caatinga: generalist in C. globosa vs. specialist in C. leucocephala