rich_metrics {metrix}

Richness metrics

Description

Calculates richness measures

Usage

rich_metrics(dataset, store = FALSE, dec_c = ".", verbose = FALSE)

Arguments

dataset

A data.frame obtained from read_data.

store

A logical value indicating if the user want to store the results in a file.

dec_c

A character used for decimal separator on results file.

verbose

A logical value indicating if progress messages should be given.

Details

The richness measures reflect the diversity of the aquatic complex (Resh et al. 1995). Increased diversity correlates with increased assemblage health and suggests that niche space, habitat, and food source are adequate to support the survival and spread of many taxa. The number of taxa measures the general variety of the macroinvertebrate assemblage. Identities of major taxonomic groups are not derived from the total taxa metric, but the removal of taxa from naturally diverse systems can be detected easily (Barbour et al., 1996).

Value

This function returns a data.frame with all the calculated richness measures:

n_taxa

N° total taxa.

n_fam

N° of families.

n_gen

N° of genus.

n_insec_fam

N° of insects families.

n_non_insec_order

N° of orders of invertebrates no insects.

n_dip_fam

N° of Diptera families.

n_dip_gen

N° of Diptera genus.

n_dip_chir_gen

N° of Diptera Chironomidae genus.

n_chir_tax

N° of Diptera Chironomidae taxa.

n_tany_tax

N° of Tanytarisni taxa.

n_stemp_tax

N° of Stempellina taxa.

n_non_chir_dip_tax

N° of Diptera no Chironomidae taxa.

n_mol_tax

N° of Mollusca taxa.

n_gastr_tax

N° of Gastropoda taxa.

n_biv_tax

N° of Bivalvia taxa.

n_crus_tax

N° of Crustacea taxa.

n_crusmol

N° of Crustacea + Mollusca taxa.

n_oligo_tax

N° of Oligochaeta taxa.

n_ephetrich

N° of Ephemeroptera + Trichoptera taxa.

Author(s)

Juan Manuel Cabrera and Julieta Capeletti.

References

Resh VH, Norris RH & Barbour MT (1995). Design and implementation of rapid assessment approaches for water resource monitoring using benthic macroinvertebrates. doi: 10.1111/j.1442-9993.1995.tb00525.x

Barbour MT, Gerritsen J, Griffith GE, Frydenborg R, McCarron E, White JS & Bastian ML (1996). A Framework for Biological Criteria for Florida Streams Using Benthic Macroinvertebrates. doi: 10.2307/1467948

See Also

read_data

Examples

#Load example data
example_data

#Run rich_metrics with that example_data
richmetrics<-rich_metrics(example_data)

#Check results
richmetrics