canopy community structure in semideciduous montane forest dominated by eremanthus erythropappus...
TRANSCRIPT
Rates of Shading
0,4 0,6 0,8 1,0
Num
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dlin
gs
0,0
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2,5Rates of Shading vs. Number of seedlingsLogisct curve
Canopy community structure in semideciduous montane forest dominated by Eremanthus
erythropappus (DC.) MacLeish (Asteraceaea)
ACKNOWLEDGMENT:
INTRODUCTION
MATERIALS AND METHODS
RESULTS AND DISCUSSION
The fragment is not dominated by E. erythropappus anymore and
mortality could happen in combination of senescence and competition for
light.
This forest is in intermediate stage of succession, with diversification of
species that are present in the canopy. The E. erythropappus have an
important role in natural regeneration of degraded areas, contributing to the
resilience of montane Atlantic rainforests.
Figure 1. A. Fitophysiognomic map of the State Park of Itacolomi (adapted from Fujaco 2007); B. Park boulderings map and study area; C. Detailed map of studied area and plots.
We investigate a monodominant population of Eremanthus
erythropappus (Asteraceae) or candeia (Fig. 1 A), established and
naturally grown after 40 years of a tea plantation abandoning, and
followed by a recent intense death of individuals (Fig. 1 B and C), in the
Itacolomi State Park, part of the MAB site Reserve of Espinhaço,
Southeastern Brazil (Fig. 2 A and B). We verified whether this population
could return to a monodominant stand or if succession is in course
towards a new species balance.
Figure 1. A. Capitulum and inflorescence of E. erythropappus; B. Study area view from the top; C. Understory in the study area. Photos: Núbia R. Campos, Sérvio P. Ribeiro.
The dead individuals were the biggest in diameter .
The other species were the biggest in first class of diameter and some
class in height.
Early secondary species were the more representative ecological group.
22 recruits were found, and those were negatively correlated with
shadow.
Species were grouped in similar ecological groups (pioneers, early secondary and tolerant species);
Parameters calculated: Shannon’s H’ diversity, equitability and phytosociological;
Diameter and height distribution of individuals were taken, and a ANOVA one way analysis was performed.
1 Evolutionary Ecology of Cannopy Insects and Natural Succession, DEBio, ICEB, Universidade Federal de Ouro Preto, MG, Brazil .2 Programa de Pós-Graduação em Ecologia de Biomas Tropicais, Universidade Federal de Ouro Preto, MG, Brazil.
Núbia R. Campos1 & Sérvio P. Ribeiro1,2. ([email protected])
A B D
B
C
Figure 3. Diameter and height distribuition. A. Diameter distribuition of community (F2;933= 50,6; p< 0,05); B. Height distribuition of community (F2, 933 = 0,61; p<0,05); C. Diameter distribuition of ecological groups (F2, 513= 5,42; p< 0,05); D. Height distribuition of ecological groups (F2, 511= 0,22; p< 0,05).
C
A B
D
Seedlings were analyzed in response to shade rate by ordinal logistic regression.
20m
20m
2m
2m
The seedling recruitment and light available at ground level
A
CONCLUSION
Figure 4. Ordinal regression logistic of number of seedlings in response of rates of shading (b = -10.55; X²wald = 8.05; p = 0.005).
Species Live Dead Total E. erythropappus 89 413 502Other individuals 428 6 434Total 517 419 936
We found 936 individuals of 53 species in 24 families.
Floristic and community parameters (diversity and equitability) were
similar to data previously found in other montane forests.
Table 1. Number of individuals of E. erythropappus and other species live and dead and the total of individuals in each class..