From a database with Frequency of occurrence (FO) (see vegetation_abundance for terminology) and occasional species as 999 you can compute the following biodiversity indexes:
Species richness
Shannon diversity index (log2)
Effective number of species (ENS)
Shannon max
Equitability
Arguments
- database
database with Frequency of occurrence (FO) and occasional species as 999 (see vegetation_abundance for terminology). Rows are species and columns are surveys. Database class must be data.frame
- occasional.species
Logical. TRUE if you want to take into account occasional species. If occasional species are considered, SRA correspond to "SRA_SC.fs.occ" (see vegetation_abundance)
- species.cover.coefficient
To set only when "occasional.species=TRUE":coeffient that multiplies FO so that the number of total touches refer to 100. SRA values for Shannon diversity index derive from the "SRA_SC.fo.occ" (see vegetation_abundance)