A method for the measurement of the size diversity based on the classical Shannon-Wiener expression was proposed as a proxy of the shape of the size distribution. The summatory of probabilities of a discrete variable (such as species relative abundances) in the original Shannon-Wiener expression was substituted by an integral of the probability density function of a continuous variable (such as body size). Here, we propose an update of this method by including the measurement of the size e-evenness, just dividing the exponential of the size diversity by its possible maximum for a given size range. Assuming a domain of the size range of (0,1), for a given logarithmic mean (m ln ) and a logarithmic standard deviation r ln ð Þ, the distribution with the highest diversity is the Log-Normal. The size e-evenness ranges between 0 and 1 because of the division by the maximum exponential diversity. Size e-evenness is useful to discriminate whether variations in size diversity are due to changes in the shape of the size distribution or caused by differences in size dispersion. Quintana et al. (2008) proposed a nonparametric method for the measurement of the size diversity as a proxy of the shape of the size distribution. Size diversity is computed on the basis of the Shannon-Wiener diversity expression (Pielou 1969) and adapted for continuous variables, such as size. The use of the size diversity for the analysis of the shape of a size distribution has several advantages (Quintana et al. 2008): (1) it integrates sizes of individuals and a size-density in the same way that Shannon-Wiener species diversity integrates the number of species and their relative abundance; (2) after data standardization, samples measured with different units, such as length, weight or volume, are comparable; and (3) its meaning is easy to interpret, since the concept of diversity is well established (Hurlbert 1971): a high size diversity means a wide size range and/or similar proportions of the different sizes along the size distribution. For the size diversity measurement the summatory of probabilities of discrete variables of the classical Shannon-Wiener expression (such as species relative abundances), is substituted by an integral involving the probability density function of the size X ð Þ of the individuals (p X x ð Þ) and takes the form
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