Reporoductive phenodynamic of Pseudopiptadenia (Leguminosae – Mimosoideae) in a Montane Rian Forest area
Abstract
Studies on sympatric and cogeneric species that share pollination and dispersal systems are helpful to investigate how phenological responses are regulated, for instance by climate or phylogenetical constraints. We have monthly registered the phenophases floral bud, open flower, immature fruit and mature fruit from June 2004 to June 2006, for ten and eleven trees of Pseudopiptadenia contorta and P. leptostachya, respectively, in an area of Montane Atlantic Forest at the Itatiaia National Park, southeastern Brazil. Both the flowering time and the duration from anthesis to the onset of fruit ripening have differed between the two species. As a result, the highest activity and intensity of the mature fruit phase occurred in the dry season for both species. Such overlapping in mature fruit phase seems to reflect adjustment to better conditions for dispersal of anemochoric fruits. As a whole, the reproductive phenodynamics were related to climate variables of the previous months, but the correlation values were low. This suggests that climate factor should be acting in synergy in the control of occurrence and intensity of phenophases in those two tree species of Atlantic Forest.
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References
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