The growing fragmentation of natural habitats intensifies the necessity to evaluate biological diversity contained in plant remnants. Composicao, estrutura e. Índice de equitabilidade de Pielou (E) Medida da abundância relativa das espécies E=H ́ /H ́ max. em que: • H ́ = índice de diversidade de Shannon; • H ́ max. 4 nov. Índice de Pielou Bárbara Lima Santiago da Costa Índice de Pielou (Equabilidade ): É derivado do índice de diversidade de Shannon e permite.
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What do we win ‘confounding’ species richness and evenness in a diversity index? Adriano Sanches Melo 1. In Community Ecology and in many applications of Conservation Biology, diversity means variety of species, which may or not include information on the relative importance of each species.
Diversity is one of the most important attributes in the study of communities and, as a result, many methods are available to its measurement. Among them, non-parametric diversity or heterogeneity indices such as Shannon and Simpson formulae are widely employed in a range of studies. These indices are composed of or confound two components, species richness and evenness. Different indices can be obtained combining the two components with different weights. The lack of an objective criteria to guide appropriate weighting of each component results in an arbitrary decision to use an index and not another.
Additionally, depending on the weight the indices give to each component, an index may indicate that community A is more diversified than community B while a second index may indicate the contrary. Also, diversity indices applied to samples differing in species richness and evenness may produce similar values.
Such problems can be avoided using alternative methods. One of them is diversity profile, which includes not one index but many diversity indices differing in the weight given to each component.
Additional alternatives include the equablidade of species richness only, Whittaker’s diagram or of dominance equabllidade scatter diagrams with axes defined by species richness and an evenness index. Except by species richness, the cited alternative methods show graphically much more information than that contained in a single value produced by a diversity index. In studies requiring a response variable to be modeled in relation to predictor variables Linear Models such as Regression and Analysis of VarianceI suggest the separate use of species richness and evenness as each one may reflect different aspect of communities.
Por exemplo, Condit et al.
Como Medir a Diversidade. Na segunda floresta levaremos muito mais tempo para isto. Hulbert nomeia 1-D para amostras finitas de PIE probability of interspecific encounter. Podemos perceber isto melhor com um exemplo simples. Suponha que pislou amostras de duas comunidades: De maneira semelhante, quando a tende a 1 e. Curvas mais inclinadas possuem menor equabilidade.
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Índice de Pielou by Bárbara Lima on Prezi
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Equabilidade de pielou pdf
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Diversity, diversity indices and tropical cockroaches. Adriano Sanches Melo, e-mail: All the contents piellu this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. Services on Demand Journal. How to cite this article.