Strong requirements for weak diversities |
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Authors: | Carlo Ricotta |
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Institution: | Department of Plant Biology, University of Rome 'La Sapienza', Piazzale Aldo Moro 5, 00185 Rome, Italy |
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Abstract: | Weikard et al . ( Diversity and Distributions , 12 , 215–217) show that the taxonomic diversity measure proposed by Ricotta (2004) violates 'weak species monotonicity'. This condition requires that the addition of a species to a given species set should always increase diversity if abundances change only marginally. They further propose a new taxonomic diversity index that overcomes this drawback. In this paper, some statistical properties of this new diversity index are briefly analysed. |
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Keywords: | Biodiversity indices expected species diversity taxonomic distinctness weak species monotonicity |
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