SciELO - Scientific Electronic Library Online

 
vol.30 issue4Patterns of species richness and abundance among cactus communities receiving different rainfall levels in the semiarid region of BrazilMorpho-anatomical and morphometric studies of the floral structures of the distylous Oldenlandia salzmannii (Rubiaceae) author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google
  • uBio

Share


Acta Botanica Brasilica

Print version ISSN 0102-3306
On-line version ISSN 1677-941X

Abstract

COSTA, Rafael Carvalho da  and  SANTOS, Flavio Antonio Maës dos. Spatial patterns of two co-occurring savanna and forest tree species in a dense fire-protected savanna fragment. Acta Bot. Bras. [online]. 2016, vol.30, n.4, pp.577-584.  Epub Nov 10, 2016. ISSN 0102-3306.  http://dx.doi.org/10.1590/0102-33062016abb0137.

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.

Keywords : Cerrado; competition; fire; microsite limitation; recruitment; SADIE; savanna; spatial patterns.

        · text in English     · English ( pdf epdf )