Sistema radicular do palmiteiro

Bovi, Marilene Leão Alves; Cardoso, Mário; Cione, José

doi:10.1590/s0006-87051978000100031

Cited by 4 publications

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“…Previous studies have shown that the mortality of small plants of E. edulis may be related to the availability of resources (Bovi et al 1990) and herbivory (, , ). Intraspecific competition amongst seedlings for soil water might be expected to be particularly acute, as more than half (by mass) of the root system is concentrated in the top 20 cm of the soil surface (Bovi et al 1978), and soils dry out during the dry season. The effects of adults on the recruitment of seedlings can occur through falling fronds creating “zones of death” around the base of the maternal palm (e.g., Denslow et al 1991).…”

Section: Discussionmentioning

confidence: 99%

The Role of Density Dependence in the Population Dynamics of a Tropical Palm

Matos

Freckleton

Watkinson

1999

Ecology

120

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The role of density dependence in the population dynamics of tropical trees has been a subject of considerable debate. Here, we present data on the demography of the edible palm Euterpe edulis, classified into seven size categories and monitored over three years. On average, each adult palm contributed 98 seedling recruits per year into the population. The pattern of mortality was similar to that of other palms, with mortality being highest among the smallest plants. Those plants with a diameter at soil level >20 mm had an annual mortality <7%. Density dependence was found to act only on the seedling stage of the life cycle. The probability of survival and transition of seedlings to the next size class were affected both by the density of seedlings and the presence of conspecific adults. Matrix modeling indicated that the true finite rate of population increase (λ) was 1.28 and that the observed reverse “J”‐shaped size distribution of plants was a consequence of the density dependence operating in the population. Elasticity analysis showed that the survival elements in the matrix contributed most to the value of λ, and that the position of the transition matrix in growth–survival–fecundity (G–L–F) space was influenced by density. The matrix model incorporating density dependence predicted size distributions and densities approximating the maximum observed in the field. Spatial simulations indicated that the predictions from the matrix model relating to the size structure of plants are robust, but that the predictions of densities are sensitive to the precise spatial dynamics of the population.

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Section: Discussionmentioning

confidence: 99%

The Role of Density Dependence in the Population Dynamics of a Tropical Palm

Matos

Freckleton

Watkinson

1999

Ecology

120

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“…Table 2), are shown for models in which population growth is density independent (i.e., with G1 set at its maximum, density-independent value) and for the equilibrium population in the density-dependent model. Intraspecific competition amongst n interactions seedlings for soil water might be expected to be pardetermining ticularly acute, as more than half (by mass) of the root that they obsystem is concentrated in the top 20 cm of the soil of density on surface (Bovi et al 1978 Table 2). Intraspecific competition amongst n interactions seedlings for soil water might be expected to be pardetermining ticularly acute, as more than half (by mass) of the root that they obsystem is concentrated in the top 20 cm of the soil of density on surface (Bovi et al 1978 Table 2).…”

Section: Density Dependencementioning

confidence: 99%

“…Previous studies have shown that the mortality of small plants of E. edulis may be related to the availability of resources (Bovi et al 1990) and herbivory (Leão and Cardoso 1974, Carvalho and Martins 1993. Intraspecific competition amongst seedlings for soil water might be expected to be particularly acute, as more than half (by mass) of the root system is concentrated in the top 20 cm of the soil surface (Bovi et al 1978), and soils dry out during the dry season. The effects of adults on the recruitment of seedlings can occur through falling fronds creating DENSITY DEPENDENCE IN A TROPICAL PALM FIG.…”

Section: Density Dependencementioning

confidence: 99%

The Role of Density Dependence in the Population Dynamics of a Tropical Palm

Matos¹,

Freckleton²,

Watkinson³

1999

Ecology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Ecological Society of America is collaborating with JSTOR to digitize, preserve and extend access to Ecology.Abstract. The role of density dependence in the population dynamics of tropical trees has been a subject of considerable debate. Here, we present data on the demography of the edible palm Euterpe edulis, classified into seven size categories and monitored over three years. On average, each adult palm contributed 98 seedling recruits per year into the population. The pattern of mortality was similar to that of other palms, with mortality being highest among the smallest plants. Those plants with a diameter at soil level >20 mm had an annual mortality <7%. Density dependence was found to act only on the seedling stage of the life cycle. The probability of survival and transition of seedlings to the next size class were affected both by the density of seedlings and the presence of conspecific adults. Matrix modeling indicated that the true finite rate of population increase (X) was 1.28 and that the observed reverse "J"-shaped size distribution of plants was a consequence of the density dependence operating in the population. Elasticity analysis showed that the survival elements in the matrix contributed most to the value of X, and that the position of the transition matrix in growth-survival-fecundity (G-L-F) space was influenced by density. The matrix model incorporating density dependence predicted size distributions and densities approximating the maximum observed in the field. Spatial simulations indicated that the predictions from the matrix model relating to the size structure of plants are robust, but that the predictions of densities are sensitive to the precise spatial dynamics of the population.1979, Hubbell and Foster 1986), known as the community drift model. In contrast to this nonequilibrium model, it has been argued at the other extreme that density-dependent and distance-related recruitment may be responsible for the low mean densities of many tropical trees and the consequent high species diversity (Janzen 1970, Connell 1971. In this latter case, specialist herbivores, seed predators, and pathogens are envisaged as maintaining populations around low densities and high species diversity. Critics of the Janzen-Connell model have suggested that the strength of density dependence is insufficient to remove the clumped distributions of seedlings beneath parents (Hubbell 1980). The community drift model of tropical forest dynamics, on the other hand, has also been criticized on the basis that it fails to take into account high levels of compositional similarity in disjunct samples of forest (Terborgh et al. 1996). Moreover, Wills et al. (1997) have found that int...

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“…O fato da E. edulis apresentar raízes superficiais (Bovi et al 1978) Burgess & Dawson 2004). A água absorvida pela copa não é usada somente na reidratação das folhas e da parte aérea, e pode ser transportada para as raízes, onde pode reidratar tecidos radiculares ou ser liberada para o solo.…”

Section: Transpiração Diurna E Noturna X Déficit De Pressão De Vaporunclassified

“…De (Bovi et al 1978), com isso, na estação seca onde o nível do lençol freático encontrase baixo, a disponibilidade de água disponível na superfície do solo pode diminuir.…”

Section: Variações Nos Níveis Do Lençol Freático Influenciam O Fluxo ...unclassified

Uso de água de três espécies arbóreas em uma restinga florestal em Ubatuba, SP

Saenz¹,

Oliveira²

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Começo agradecendo ao meu orientador Prof. Rafael Silva Oliveira pelos ensinamentos desde 2007, antes da minha iniciação científica e durante todo o mestrado.Por ter aceitado me orientar, pelas cobranças, pela amizade e compreensão.Agradeço a minha família pelo carinho e apoio em todas as minhas decisões.Meus pais pela educação e meus irmãos pelas ajudas que foram desde o empréstimo do computador até ajudas no campo.Agradeço em especial à Renata Burin, pelo amor, compreensão e apoio, além dos sonhos compartilhados e caminhos trilhados.

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Sistema radicular do palmiteiro

Cited by 4 publications

References 0 publications

The Role of Density Dependence in the Population Dynamics of a Tropical Palm

The Role of Density Dependence in the Population Dynamics of a Tropical Palm

The Role of Density Dependence in the Population Dynamics of a Tropical Palm

Uso de água de três espécies arbóreas em uma restinga florestal em Ubatuba, SP

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