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Type: Artigo de periódico
Title: Demography of the clonal palm Geonoma brevispatha in a Neotropical swamp forest
Author: Souza, AF
Martins, FR
Abstract: We expected that in clonal plants with the phalanx growth form, prereproductive ramets function as a meristem bank that helps buffer ramet demography against environmental fluctuations. Specifically, we evaluated four expectations for the forest understorey clonal palm Geonoma brevispatha in a swamp forest in south-eastern Brazil. Our expectations were are follows: (i) the vital rates of prereproductive ramets are more responsive to genet-related characteristics (genet size, distance and size of the nearest genet neighbour, and reproductive ramet survivorship) than to environmental variables (canopy openness, basal area of small trees, flooding, and distance and size of the nearest large tree neighbour), whose effects are expected to affect ramet dynamics indirectly through physiological integration; (ii) the progress of prereproductive ramets to later stages is dependent on the death of reproductive ramets; (iii) the population dynamics of G. brevispatha is resistant to significant interannual changes in the vital rates of ramets, (i.e. the occurrence of good and bad years); and (iv) there are large negative covariances among demographic transitions within a given year, as well as between years, reflecting the flexibility of G. brevispatha to adjust to environmental variability. Expectations 1, 2 and 4 were confirmed, while expectation 3 was only partially confirmed. Matrix models predicted that the growth rate of the overall ramet population was significantly greater than unity in the first study year, but it was significantly smaller than 1.0 in the second study year. Ramet population growth rates at the level of individual genets were greater than unity in the majority of genets in the first year, but in the second year genets with growth rates smaller than unity prevailed. Ramet population dynamics seems to be resistant to the succession of good and bad years; in effect, the presence of a meristem bank of ramets helps stabilize lambda.
Subject: Geonoma brevispatha
life table response experiment
matrix model
population dynamics
swamp forest
tropical forest
Country: Inglaterra
Editor: Blackwell Publishing
Citation: Austral Ecology. Blackwell Publishing, v. 31, n. 7, n. 869, n. 881, 2006.
Rights: fechado
Identifier DOI: 10.1111/j.1442-9993.2006.01650.x
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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