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ABSENCE OF STABILIZATION POINT OF THE SPECIES ACCUMULATION CURVE IN TROPICAL FORESTS

Schilling, Ana Cristina; Batista, João Luis Ferreira; Couto, Hilton Thadeu Zarate do
Fonte: CENTRO PESQUISAS FLORESTAIS, UFSM; SANTA MARIA Publicador: CENTRO PESQUISAS FLORESTAIS, UFSM; SANTA MARIA
Tipo: Artigo de Revista Científica
POR
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The definition of the sample size is a major problem in studies of phytosociology. The species accumulation curve is used to define the sampling sufficiency, but this method presents some limitations such as the absence of a stabilization point that can be objectively determined and the arbitrariness of the order of sampling units in the curve. A solution to this problem is the use of randomization procedures, e. g. permutation, for obtaining a mean species accumulation curve and empiric confidence intervals. However, the randomization process emphasizes the asymptotical character of the curve. Moreover, the inexistence of an inflection point in the curve makes it impossible to define objectively the point of optimum sample size.