PHENOLOGICAL STRATEGIES OF DIOECIOUS SPECIES IN RESPONSE TO THE ENVIRONMENTAL VARIATIONS OF RUPESTRIAN GRASSLANDS.

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Darliana Costa Fonseca Márcio Leles Romarco Oliveira Israel Marinho Pereira Cássia Michelle Cabral Cristiane Coelho Moura Evandro Luiz Mendonça Machado

Abstract

Rupestrian grassland present great diversity of phenological patterns in response to the high biodiversity of this ecosystem and its environmental variation. Dioecious species show distinction between the genders in relation to the nutritional requirements to growth and reproduction, comprehending determining factors, especially in restrictive environments. The study objected to comprehend the reproductive and vegetative phenology of the dioecious species Baccharis playtypoda, joining the phenological strategies to the sexual system and to the environment seasonal variations. The study was performed in three areas of rupestrian grassland, where it was observed the phenology of thirty plants from September/2010 through September/2011. Used the Fournier intensity method, correlation of Spearman and circular analysis. The reproductive phenophases began in February with ending between September and October, while the vegetative phenophases presented intensity variation over that period. The vegetative phenophases of both genders has shown low seasonal standard, while the reproductive phenophases has presented strong seasonality. The species B. platypoda has presented little variations in the phenological strategies of male and female individuals, mainly during the reproductive phenophases and in the vegetative growth for the allocation of resources. The species reproductive phenology had been associated to some environmental variables, mainly for the fructification phenophases, while the vegetative phenology, in general, had been most associated to the reproductive phenology of the species.

Article Details

How to Cite
FONSECA, Darliana Costa et al. PHENOLOGICAL STRATEGIES OF DIOECIOUS SPECIES IN RESPONSE TO THE ENVIRONMENTAL VARIATIONS OF RUPESTRIAN GRASSLANDS.. CERNE, [S.l.], v. 23, n. 4, p. 517-527, jan. 2018. ISSN 2317-6342. Available at: <http://cerne.ufla.br/site/index.php/CERNE/article/view/1615>. Date accessed: 21 feb. 2018.
Keywords
Baccharis platypoda; Asteraceae; reproductive phenology; vegetative phenology; dioecious; seasonality
Section
Article

References

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