diversidad de la vegetación durante su recuperación tras una creciente extraordinaria del río paraná medio (argentina)
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2010
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Abstract
La diversidad florística en las planicies de inundación está ligada a la dinámica de la vegetación, por lo que su comprensión depende de las escalas espacial y temporal el régimen hidrológico del río. La planicie de inundación del Río Paraná, Argentina, tiene una alta diversidad biológica, aolo conocida a través de estudios puntuales no comparables entre si. El objetivo de esta contribución fue analizar la diversidad de la vegetación herbácea a largo plazo, desde su reinstalación después de una inundación catastrófica hasta su recuperación, en dos áreas (norte y sur) del Paraná Medio. Cuando el nivel del agua disminuyó después de la creciente catastrófica de 1982-83, se realizó el primer muestreo en una comunidad pionera, y en años posteriores, otros dos en etapas avanzadas de recuperación de la vegetación. Se registraron las especies presentes y se estimó su abundanciacobertura. Se calcularon las curvas de riqueza florística, de diversidad de Shannon y Hurlbert y de dominancia de Simpson en ambas áreas, utilizando el programa EcoSim. La riqueza florística resultó mayor en el norte del Paraná Medio, mientras que la dominancia lo fue en el sur. Los índices de diversidad no reflejan estas variaciones, pues al compensarse entre sí sus componentes, dan como resultado valores relativamente estables.
Diversity of vegetation during its recovery from a catastrophic flood of the Medium Paraná River (Argentina). River floodplains have a high biological diversity that is intensely influenced by vegetation dynamics, changes in space and time scales, and the river`s hydrological regime. The vegetation composition of the medium and lower Paraná River has been analyzed previously, with different approaches and criteria that cannot be compared. The aim of this study is to analyze the diversity of the herbaceous vegetation over long time spans, from its regeneration after a catastrophic flood to its recovery, in the North and South sites of the flooding valley of the Medium Paraná River. The first sampling of a pioneer community was performed after the 1982-83 catastrophic flood, and included the surveillance of two plots in two successive recovery stages. Floristic composition and cover-abundance of all species were recorded per plot. Floristic richness, using jackknife, Shannon and Hurlbert diversity and Simpson dominance curves were calculated for each site and for each survey, using EcoSim (software). Floristic richness was higher in the North of Medium Paraná, while dominance was higher in the South. Diversity indexes did not varied significantly and resulted in relatively stable values, because its components compensate each other. Rev. Biol. Trop. 58 (2): 707-716. Epub 2010 June 02.
Diversity of vegetation during its recovery from a catastrophic flood of the Medium Paraná River (Argentina). River floodplains have a high biological diversity that is intensely influenced by vegetation dynamics, changes in space and time scales, and the river`s hydrological regime. The vegetation composition of the medium and lower Paraná River has been analyzed previously, with different approaches and criteria that cannot be compared. The aim of this study is to analyze the diversity of the herbaceous vegetation over long time spans, from its regeneration after a catastrophic flood to its recovery, in the North and South sites of the flooding valley of the Medium Paraná River. The first sampling of a pioneer community was performed after the 1982-83 catastrophic flood, and included the surveillance of two plots in two successive recovery stages. Floristic composition and cover-abundance of all species were recorded per plot. Floristic richness, using jackknife, Shannon and Hurlbert diversity and Simpson dominance curves were calculated for each site and for each survey, using EcoSim (software). Floristic richness was higher in the North of Medium Paraná, while dominance was higher in the South. Diversity indexes did not varied significantly and resulted in relatively stable values, because its components compensate each other. Rev. Biol. Trop. 58 (2): 707-716. Epub 2010 June 02.
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franceschi2010revistadiversidad
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| Authors | ;Eduardo A Franceschi;Patricia S Torres;Juan P Lewis |
| Journal | science journal of university of zakho |
| Year | 2010 |
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