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Structure Of Ontogenetic Stages In A Native Population Of The Palm Syagrus Romanzoffiana (cham.) Glassman (arecaceae) [estrutura De Estádios Ontogenéticos Em População Nativa Da Palmeira Syagrus Romanzoffiana (cham.) Glassman (arecaceae)]
Registro en:
Acta Botanica Brasilica. , v. 22, n. 1, p. 119 - 130, 2008.
1023306
10.1590/S0102-33062008000100014
2-s2.0-44249099275
Autor
Bernacci L.C.
Martins F.R.
Dos Santos F.A.M.
Institución
Resumen
Syagrus romanzoffiana is ecologically and economically important, including the production of good-quality hearts of palm. Aiming to describe this plant's basic life cycle, we studied a natural population in the swamp forest at the Santa Genebra Reserve, Campinas municipality, São Paulo state. Observations and measurements were made, and repeated after 400 ± 3 days, in 100 randomly located plots (5x5 m) and sub-plots (2x2 m), in an area of 1 ha. Six ontogenetic stages were recognized: seedling (narrow entire leaf), juvenile phase 1 (entire leaf, width ≥ 2 cm), juvenile phase 2 (segmented leaf), immature (segmented leaf, aerial stem), virgin (aerial stem, cauligenous roots), and reproductive (cauligenous roots and periodic presence of reproductive structures). Since the moment of trophic independence could not be determined in the field, leaf characteristics were used to identify seedlings. Seedlings live for a long time in the low light of the understory. Even though significant differences could be observed, size and leaf production overlapped among different stages. Remote germination, used to explain the widespread occurrence of the species even in dry regions, and cauligenous roots that improve fixation and nutrition previous to reproduction in swamp forests, are morphological structures and properties acquired or lost in each stage that may represent adaptive advantages under different circumstances during ontogeny of S. romanzoffiana. 22 1 119 130 Begon, M., Harper, J.L., Townsend, C.R., (1996) Ecology: Individuals, populations and communities, , 3rd. ed. Oxford, Blackwell Sci Bernacci, L.C., Goldenberg, R., Metzger, J.P., Estrutura florística de 15 fragmentos florestais ripários na Bacia do Jacaré-Pepira (SP). 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