README.md

In evertonmaciel/rrindex: What the Package Does (Calculates the rarity index by species, rr index)

rrindex

A R package to calculate a rarity index

Overview

The rr index is a synthetic measure of the geographic range, habitat specificity, and population size. Given a list of species, the reindex package return for each species an index ranging from 0 (common species) to 1 (rare species).

Developer

Everton Alves Maciel

University of Campinas

email address: [e-mail]

Install rareindex from github

install.packages('devtools')

library(devtools)

install_github('evertonmaciel/rrindex')

Import packages

library(rrindex)

Usage

rareindex()

The function calculates a rarity index (RR) for each species in a community based on the Rabinowitz method. The function returns a list of species with four indexes for each species: the geographic range index (GRI), which is the inverse of the species' geographical range; the habitat specificity index (HSI), which is the inverse of the maximum number of habitats where the species occurs; the population size index (PSI), which is the inverse of the maximum population size of the species; and the RR index, which is the average of the GRI, HSI, and PSI indexes.

rareboxplot rareplot()

Function to calculate the indexes of rarity for each specie of a community. This function uses the input data table, containing the list of species, latitude and longitude, number of habitats and population size.

Refence

Maciel, E. A. (2021). An index for assessing the rare species of a community. Ecological Indicators, 124, 107424.

Rabinowitz, D. (1981). Seven forms of rarity. In H. Synge (Ed.), The biological aspects of rare plants conservation (pp. 205–217).

Rabinowitz, D. (1978). Abundance and diaspore weight in rare and common prairie grasses. Oecologia, 37(2), 213–219.

Rabinowitz, D., Rapp, J. K., & Dixon, P. M. (1984). Competitive abilities of sparse grass species: means of persistence or cause of abundance. Ecology, 65(4), 1144–1154.

evertonmaciel/rrindex documentation built on Jan. 19, 2024, 7:37 p.m.