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

<p><b>TABLE 2 |</b> 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.</p><table><tbody><tr><th><b>Functional diversity index</b></th><th><b>Number of studies*</b></th><th><b>Description</b></th><th><b>References</b></th></tr></tbody><tbody><tr><th>Functional Richness (FRic)</th><td>64</td><td>Volume of the functional space occupied by the community</td><td>Mason <i>et al</i>. (2005), Vill&eacute;ger <i>et al</i>. (2008)</td></tr><tr><th>Functional Evenness (FEve)</th><td>46</td><td>Sum of the minimum spanning tree branch length weighted by relative abundance of the two species</td><td>Mason <i>et al</i>. (2005), Vill&eacute;ger <i>et al</i>. (2008)</td></tr><tr><th>Functional Divergence (FDiv)</th><td>34</td><td>Species deviance from the mean distance to the center of gravity weighted by relative abundance</td><td>Mason <i>et al</i>. (2005), Vill&eacute;ger <i>et al</i>. (2008)</td></tr><tr><th>Functional Dispersion (FDis)</th><td>34</td><td>Mean distance in functional space of individual species to the centroid of all species</td><td>Lalibert&eacute;, Legendre (2010)</td></tr><tr><th>Rao (Q)</th><td>19</td><td>Sum of species distance weighed by abundance</td><td>Botta-Duk&aacute;t (2005), Ricotta, Moretti (2011)</td></tr><tr><th>Functional Originality (FOri)</th><td>10</td><td>Mean distance between each species and its nearest neighbour in the functional space</td><td>Mouillot <i>et al</i>. (2013)</td></tr><tr><th>Functional Specialization (FSpe)</th><td>8</td><td>Mean Euclidean distance between each species and the average position of all species in the functional space</td><td>Mouillot <i>et al</i>. (2013)</td></tr><tr><th>Functional Redundancy (FRed)</th><td>8</td><td>Difference between species diversity (Gini-Simpson diversity index) and Rao; average number of species or as mean abundance or biomass per functional group</td><td>de Bello <i>et al</i>. (2007), Lalibert&eacute; <i>et al</i>. (2010)</td></tr><tr><th>Functional Diversity (FD)</th><td>3</td><td>Sum of the largest branch of the functional dendrogram</td><td>Petchey, Gaston (2002)</td></tr><tr><th>Functional Uniqueness (FUni)</th><td>3</td><td>Ratio between Rao index and the Simpson diversity index, relating functional diversity to the maximum dissimilarity value of the community</td><td>Ricotta <i>et al</i>. 2016</td></tr><tr><th>Functional Identity</th><td>2</td><td>Expressed as the biomass-weighted mean trait value for a community</td><td>Mouillot <i>et al</i>. (2011)</td></tr><tr><th>Functional Vulnerability</th><td>2</td><td>Sum of the total number of functional entities and the number of species in functional entity</td><td>Mouillot <i>et al</i>. (2014)</td></tr><tr><th>Mean Pairwise Distance (MPD)</th><td>2</td><td>The average of the distances between pairs of species in the focal community</td><td>Webb (2000)</td></tr><tr><th>Mean Nearest Taxon Distance (MNTD)</th><td>1</td><td>The average of distances between the species of focal community with the respective functionally most similar species (&ldquo;neighbor closer&rdquo;)</td><td>Webb (2000)</td></tr><tr><th>Functional Regularity Index (FRO)</th><td>1</td><td>Species evenness in functional space weighted by species abundances</td><td>Mouillot <i>et al</i>. (2005)</td></tr><tr><th>Functional Distinctiveness</th><td>1</td><td>Functional dissimilarity of one species in relation to the other species of the community, representing functional redundancy</td><td>Greni&eacute; <i>et al</i>. (2017)</td></tr></tbody></table>