TABLE 2 in Functional diversity: a review on freshwater fish research

TABLE 2 | List of functional diversity indices in the reviewed studies, number of studies that used the index and a brief description of each index. *The number of studies does not correspond to the total number of studies reviewed, but the number of studies that used functional indices to measure the functional diversity.
Functional diversity indexNumber of studies*DescriptionReferencesFunctional Richness (FRic)64Volume of the functional space occupied by the communityMason et al. (2005), Villéger et al. (2008)Functional Evenness (FEve)46Sum of the minimum spanning tree branch length weighted by relative abundance of the two speciesMason et al. (2005), Villéger et al. (2008)Functional Divergence (FDiv)34Species deviance from the mean distance to the center of gravity weighted by relative abundanceMason et al. (2005), Villéger et al. (2008)Functional Dispersion (FDis)34Mean distance in functional space of individual species to the centroid of all speciesLaliberté, Legendre (2010)Rao (Q)19Sum of species distance weighed by abundanceBotta-Dukát (2005), Ricotta, Moretti (2011)Functional Originality (FOri)10Mean distance between each species and its nearest neighbour in the functional spaceMouillot et al. (2013)Functional Specialization (FSpe)8Mean Euclidean distance between each species and the average position of all species in the functional spaceMouillot et al. (2013)Functional Redundancy (FRed)8Difference between species diversity (Gini-Simpson diversity index) and Rao; average number of species or as mean abundance or biomass per functional groupde Bello et al. (2007), Laliberté et al. (2010)Functional Diversity (FD)3Sum of the largest branch of the functional dendrogramPetchey, Gaston (2002)Functional Uniqueness (FUni)3Ratio between Rao index and the Simpson diversity index, relating functional diversity to the maximum dissimilarity value of the communityRicotta et al. 2016Functional Identity2Expressed as the biomass-weighted mean trait value for a communityMouillot et al. (2011)Functional Vulnerability2Sum of the total number of functional entities and the number of species in functional entityMouillot et al. (2014)Mean Pairwise Distance (MPD)2The average of the distances between pairs of species in the focal communityWebb (2000)Mean Nearest Taxon Distance (MNTD)1The average of distances between the species of focal community with the respective functionally most similar species (“neighbor closer”)Webb (2000)Functional Regularity Index (FRO)1Species evenness in functional space weighted by species abundancesMouillot et al. (2005)Functional Distinctiveness1Functional dissimilarity of one species in relation to the other species of the community, representing functional redundancyGrenié et al. (2017)