Appendix D. A table listing the main features of the "dbFD" function. The "F_RED" function is from Villéger et al. (2008).
F_RED |
dbFD |
|
Input - traits |
|
|
Allows quantitative (i.e., continuous) traits? |
yes |
yes |
Allows qualitative (i.e., categorical) traits? |
no |
yes |
Allows semi-quantitative (i.e., ordinal) traits? |
no |
yes |
Tolerates missing values? |
no |
yes |
Allows one trait only? |
no |
yes |
Can have more traits than species? |
no |
yes |
Can be a species × species distance matrix? |
no |
yes |
Allows weighting of individual traits? |
no |
yes |
Input - abundances |
||
Allows sites with only one species? |
no |
yes |
Allows sites with only two species? |
no |
yes |
Can be missing? |
no |
yes |
Options |
|
|
Can standardize traits or not? |
no |
yes |
Can weigh indices by abundances or not? |
no |
yes |
Different ways of measuring FRic depending on the situation? |
no |
yes |
Can FRic be standardized by the global hull volume (or other)? |
no |
yes |
Can respect S > 2T condition* when FRic is the convex hull volume? |
no |
yes |
Computes Rao’s quadratic entropy Q? |
no |
yes |
Computes FDis (functional dispersion)? |
no |
yes |
Computes CWM (community-weighted trait means)? |
no |
yes |
Computes FGri (functional group richness)? |
no |
yes |
Notes: S is the number of functionally singular species in the community, and T is the number of traits. *This condition was suggested by Villéger et al. (2008) for comparing FRic values between communities.
LITERATURE CITED
Villéger, S., N. W. H. Mason, and D. Mouillot. 2008. New multidimensional functional diversity indices for a multifaceted framework in functional ecology. Ecology 89:2290–2301.