It is expressed using a floristic inventory.AbundanceThis refers to the number of individuals per species in a given area (Mateucci & Colma, 1982).Absolute abundances (number of individuals per species) and relative abundances (percentage proportion of each species out of the total number of individuals) were calculated (Lamprecht, 1990).FrequencyAbsolute frequency (presence or absence of a species on a plot) and relative frequency (presence or absence of a species on a plot over a given total of plots) (Lamprecht, op. cit.), were calculated.