rli.map: Mapping the Red List Index.

In red: IUCN Redlisting Tools

Mapping the Red List Index.

Description

Creates a map for the red list index according to species distribution and threat status.

Usage

rli.map(spData, layers, layers2 = NULL, tree = NULL)

Arguments

spData	Either a vector with species assessment categories for a single point in time or a matrix with two points in time in different columns (species x date). Values can be text (EX, EW, RE, CR, EN, VU, NT, DD, LC) or numeric (0 for LC, 1 for NT, 2 for VU, 3 for EN, 4 for CR, 5 for RE/EW/EX).
layers	Species distributions (0/1), a Raster* object as defined by package raster.
layers2	Species distributions (0/1) on the second point in time, a Raster* object as defined by package raster. If there are two dates but no layers2, the distributions are assumed to be kept constant in time.
tree	An hclust or phylo object (used when species are weighted by their unique contribution to phylogenetic or functional diversity).

Details

The IUCN Red List Index (RLI) (Butchart et al. 2004, 2007) reflects overall changes in IUCN Red List status over time of a group of taxa. The RLI uses weight scores based on the Red List status of each of the assessed species. These scores range from 0 (Least Concern) to Extinct/Extinct in the Wild (5). Summing these scores across all species and relating them to the worst-case scenario, i.e. all species extinct, gives us an indication of how biodiversity is doing. Each species weight can further be influenced by how much it uniquely contributes to the phylogenetic or functional diversity of the group (Cardoso et al. in prep.).

Value

A RasterLayer with point values (if a single date is given) or change per cell (if two dates are given).

References

Butchart, S.H.M., Stattersfield, A.J., Bennun, L.A., Shutes, S.M., Akcakaya, H.R., Baillie, J.E.M., Stuart, S.N., Hilton-Taylor, C. & Mace, G.M. (2004) Measuring global trends in the status of biodiversity: Red List Indices for birds. PloS Biology, 2: 2294-2304.

Butchart, S.H.M., Akcakaya, H.R., Chanson, J., Baillie, J.E.M., Collen, B., Quader, S., Turner, W.R., Amin, R., Stuart, S.N. & Hilton-Taylor, C. (2007) Improvements to the Red List index. PloS One, 2: e140.

Examples

sp1 <- terra::rast(matrix(c(1,1,1,0,0,0,0,0,NA), ncol = 3))
sp2 <- terra::rast(matrix(c(1,0,0,1,0,0,1,0,NA), ncol = 3))
sp3 <- terra::rast(matrix(c(1,0,0,0,0,0,0,0,NA), ncol = 3))
sp4 <- terra::rast(matrix(c(0,1,1,1,1,1,1,1,NA), ncol = 3))
layers <- c(sp1, sp2, sp3, sp4)
spData <- c("CR","EN","VU","LC")
terra::plot(rli.map(spData, layers))

red documentation built on Sept. 9, 2023, 1:07 a.m.