tol_pres_abs: Tolerance Index for Presence/Absence

Description Usage Arguments Value

Description

Tolerance Index for Presence/Absence

Usage

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tol_pres_abs(long.df, taxa.rank = "FAMILY", master.df,
  tolerance.value = "BIBI_TV")

Arguments

long.df

Taxonomic counts arrange in a long data format (i.e., each row represents a unique sample and taxon).

taxa.rank

The taxonomic rank used to perform the analysis. You must sepecify either "FAMILY" or "GENUS" (Defualt = "FAMILY").

master.df

A master taxa list including taxonomic ranks Phylum through the specified taxonomic rank (Family or Genus) and the an associated list of tolerance values. The default is set to the master taxa list included in the BIBI package. The master taxa list can be viewed with the following script: master.df <- data(master)

tolerance.value

The name of the column in the master taxon list (specified using the master variable) that contains tolerance values on a scale of 0-10.

Value

The average tolerance score using only presence/absence data for each unique sampling event. This metric is calculated at the family or genus level. If taxon does not have an assigned tolerance value it will not contribute to the final score. The each taxon is represented by the taxon's tolerance value. If the tolerance value is missing it would be treated effectively as a zero, which would reduce the average tolerance score; to avoid this issue, it is more effective to remove the taxa without any tolerance values. However, if a large portion of the sample is composed of a taxon or taxa without assigned tolerance values the final value may be a poor representation of the sample. Every effort should be made to assign each taxon a tolerance value. If you have tolerance values that you would like to contribute and share through the BIBI package please email Zachary M. Smith ([email protected]).


zsmith27/Benthos documentation built on May 5, 2019, 2:38 a.m.