期刊
OECOLOGIA
卷 180, 期 4, 页码 933-940出版社
SPRINGER
DOI: 10.1007/s00442-016-3546-0
关键词
Assembly rules; Biodiversity indices; Community; Phylogenetic diversity; Trait variance
类别
资金
- Grant Agency of the Czech Republic [P505/12/1296, 13-17118S]
- Spanish MINECO [CGL2014-53789-R]
- Estonian Research Council [ETF 8613]
- Estonian Ministry of Education and Research [IUT 20-29]
- European Regional Development Fund (Center of Excellence FIBIR)
- European Community [626392]
- [RVO 67985939]
While an increasing number of indices for estimating the functional trait diversity of biological communities are being proposed, there is a growing demand by ecologists to clarify their actual implications and simplify index selection. Several key indices relate to mean trait dissimilarity between species within biological communities. Among them, the most widely used include (a) the mean species pairwise dissimilarity (MPD) and (b) the Rao quadratic entropy (and related indices). These indices are often regarded as redundant and promote the unsubstantiated yet widely held view that Rao is a form of MPD. Worryingly, existing R functions also do not always simplify the use and differentiation of these indices. In this paper, we show various distinctions between these two indices that warrant mathematical and biological consideration. We start by showing an existing form of MPD that considers species abundances and is different from Rao both mathematically and conceptually. We then show that the mathematical relationship between MPD and Rao can be presented simply as Rao = MPD x Simpson, where the Simpson diversity index is defined as 1 - dominance. We further show that this relationship is maintained for both species abundances and presence/absence. This evidence dismantles the paradigm that the Rao diversity is an abundance-weighted form of MPD and indicates that both indices can differ substantially at low species diversities. We discuss the different interpretations of trait diversity patterns in biological communities provided by Rao and MPD and then provide a simple R function, called melodic, which avoids the unintended results that arise from existing mainstream functions.
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