tol_metrics: Tolerance metrics

In metrix: Water Quality Metrics Calculator

Tolerance metrics

Description

Indicate sensitivity of the assemblage and component species to various types of disturbance.

Usage

tol_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

Most of the metrics applied in the study of macroinvertebrates use as a key factor the tolerance or intolerance of the different taxa to a certain disturbance, normally organic contamination. The relationship between the number of organisms that are tolerant and intolerant to contamination is a common resource in the metrics used. Further metrics (multimetric indexes) can be derived from a combination of these primary metrics (Prat et al., 2009). The Limnodrilus hoffmeisteri/total density ratio, which was developed by Marchese & Ezcurra de Drago (1999), increases in environments with organic contamination.

Value

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

r_oligochir	Oligochaeta/Chironomidae.
r_oligoset	Oligochaeta with setaform chaetae/Oligochaeta without setaform chaetae.
r_tanychir	Tanytarsini/Chironomidae.
den_t_lhoff	Limnodrilus hoffmeisteri/Total density.
den_t_bothr	Bothrioneurum/Total density.
den_t_tubi	Tubifex/Total density.
den_t_dero	Dero/Total density.
den_t_prist	Pristina/Total density.
den_t_chiro	Chironomus/Total density.

Author(s)

Juan Manuel Cabrera and Julieta Capeletti.

References

Marchese M & Ezcurra de Drago I (1999). Use of benthic macroinvertebrates as organic pollution indicators in lotic environments of the Parana River drainage basin. https://agro.icm.edu.pl/agro/element/bwmeta1.element.agro-article-e981d07b-e469-4460-a7fe-3239650cd089

Prat N, Ríos B, Acosta R & Rieradevall M (2009). Los macroinvertebrados como indicadores de calidad de las aguas. http://www.ub.edu/riosandes/docs/MacroIndLatinAmcompag0908.pdf

See Also

read_data

Examples

#Load example data
example_data

#Run tol_metrics with that example_data
tolmetrics<-tol_metrics(example_data)

#Check results
tolmetrics

metrix documentation built on Nov. 12, 2022, 9:05 a.m.