The Euclimatch package provides the Euclidean “Climatch”
algorithm [1] in an R environment to deliver versatility in the use of
user-defined historical or projected climate data (e.g., WorldClim [2],
MERRAclim [3], Global Climate Models [4]) and geographic location data
(e.g., species occurrence records typically based on longitude and
latitude, ecoregions, watersheds, global administrative areas), in
climate matching.
Climate matching is a method is used in biological risk assessment frameworks, such as horizon scanning and invasive species risk assessment tools (e.g., Freshwater Invasiveness Scoring Kit; FISK [5]), or independent research [6,7,8,9], to estimate non-native species survival in recipient (target) non-native regions, or the survival of species transported in trade pathways among regions.
The Euclimatch package also provides functions to assist
in climate data extraction and visualizations of climate match data, and
offers the use of parallelization to maximize processing speed of larger
datasets. To further quicken processing, the climatch_vec()
function, the engine of the package, which runs the “Climatch”
algorithm, was coded in C++ and integrated with the Rcpp
package [10]. This package imports and relies on the terra
package [11] for working with the spatial data, such as extraction, and
foreach [12] and doParallel [13] for parallel
computing.
| Function name | Description |
|---|---|
extract_clim_data() |
Extracts the climate data of single or multiple locations |
climatch_vec() |
Runs “Climatch” algorithm, provides vector of climatch score (0-10) for each grid cell in the recipient region |
climatch_sum() |
Provides a summary climatch score of the percentage of grid cells within recipient region(s) |
climatch_plot() |
Provides a plot of climatch_vec(), using
terra::plot(), or a SpatRaster object that can
then be used in a different visualization package e.g.,
ggplot2, tmap, rasterVis |
climatch_par() |
Runs climatch_vec() or climatch_sum() in
parallel for faster computing |
For Windows operating systems a recent verion of Rtools is required to compile the C++ code. See https://cran.r-project.org/bin/windows/Rtools/
# Install from CRAN
install.packages(“Euclimatch”)
# Load the library
library(Euclimatch)Here, we provide several examples of the use of Euclimatch in climate matching.
We begin the workflow with loading other helpful packages, climate data as a SpatRaster or raster object (e.g., .tif), location data as SpatVector, SpatialPolygonsDataFrame, SpatialPolygons (e.g., .shp), or longitude and latitude points as a dataframe (e.g., .csv) or list of dataframes. Here, we use Freshwater Ecoregions of the World [14], downloaded at [15], for the recipient regions. For our source region, we use the species occurrence records of the Oscar (Astronotus ocellatus) drawn from gbif [16]. Select climatic variables were based on [17], though it is important to note other variable sets are also used [6,7,8,9].
# If 'terra', 'geodata' or 'dplyr' are not installed, install then load climate and spatial data
#install.packages(c('terra', 'geodata','dplyr'))
library(terra) # Spatial data
library(geodata) # Download climate data
library(dplyr) # For %>% operator
# set the projection
proj <- c("+proj=lonlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0")
# Load location data:
# Freshwater ecoregions of the world GIS shapefile data: https://www.feow.org/download
feow <- terra::vect("~/feow.shp", crs = proj)
feow <- feow[1:426,] # Trim ecoregions to described ecoregions
# Load and clean species occurrence data e.g., for Oscar (Astronotus ocellatus)
# from GBIF.org (24 June 2023) GBIF Occurrence Download https://doi.org/10.15468/dl.yzjcv7
ast_oce_occurrences <- read.csv("~/astronotus.ocellatus.csv", header=T)
# Remove occurrences with invalid precision, datum, count, and coordinate mismatch.
ast_oce_occur <- ast_oce_occurrences %>% filter(!grepl("COORDINATE_PRECISION_INVALID|GEODETIC_DATUM_INVALID|CONTINENT_COORDINATE_MISMATCH|INDIVIDUAL_COUNT_INVALID", "issue"))
# IMPORTANT # Retain only lon and lat columns
ast_oce_occur <- data.frame("lon" = ast_oce_occur[,"decimalLongitude"], "lat" = ast_oce_occur[,"decimalLatitude"])
# Climate data from worldclim - see also https://www.worldclim.org/
hist_clim <- worldclim_global(var = "bio", res = 10, version="2.1", path=tempdir())
terra::crs(hist_clim) <- proj
# Climate projections
CanESM_370_2070 <- cmip6_world(model = "CanESM5", ssp = "370", time = "2061-2080", var = "bio", res = 10, version="2.1", path=tempdir())
terra::crs(CanESM_370_2070) <- proj
# Lets select variables predictive of freshwater animal survival [17]
freshwater_var <- c(1,6,9,11)
hist_clim <- hist_clim[[freshwater_var]]
CanESM_370_2070 <- CanESM_370_2070[[freshwater_var]]With data loaded, we can calculate the global variances of our
climate data, which are used in the “climatch” algorithm [1]. First, we
rename our variable columns so that they are the same across climate
data objects if we are using multiple climate data sets. Then, compute
the variances with var() and apply(). For
climate matching with climate change projections and historical data
sets we can use the mean values between variances of each climate data
set.
#Rename variables
names(hist_clim) <- c("bioclim1", "bioclim6","bioclim9","bioclim11")
names(CanESM_370_2070) <- c("bioclim1", "bioclim6","bioclim9","bioclim11")
# IMPORTANT # Compute global variance of climate data to use in climate match
gv_hist <- apply(na.omit(terra::values(hist_clim, dataframe = T)), 2, var) Here, we can use extract_clim_dat() to extract climate
data from points or polygons.
# Extract climate data
ast_oce_hist <- extract_clim_data(climdat = hist_clim, locations = ast_oce_occur) # Oscar occurrences, historical climate
gl_hist <- extract_clim_data(climdat = hist_clim, locations = feow[16,]) # Recipient Laurentian Great Lakes, historical climate
gl_fut <- extract_clim_data(climdat = CanESM_370_2070, locations = feow[16,]) # Recipient Laurentian Great Lakes, future climateNow we can run our climate matching. The climatch_vec()
function returns a vector of climatch scores for each grid cell in the
recipient region.
# Both recipient and source historical
climatch_hist <- climatch_vec(recipient = gl_hist, source = ast_oce_hist, globvar = gv_hist)
# Recipient under climate change and source historical
climatch_fut <- climatch_vec(recipient = gl_fut, source = ast_oce_hist, globvar = gv_hist)Plot the climate matches with the climatch_plot()
function. Provide the original recipient region spatial object and the
climate data SpatRaster or raster so the function can first create a
SpatRaster of the climatch data.
par(mfrow =c(1,2)) # Plots in 1 row two columns
climatch_plot(recipient = feow[16,], climdat = hist_clim, climatch = climatch_hist)
plot(feow[16,], add=T) # Add outiline of our recipient region.
climatch_plot(recipient = feow[16,], climdat = hist_clim, climatch = climatch_fut)
plot(feow[16,], add=T)
.png?raw=true)
If we want to utilize different packages, such as tmap, levelplot,
ggplot or rasterVis for visualizations, we can use the
climatch_plot() function but with the argument and command
provide_raster = TRUE to return a SpatRaster without the
plot.
library(rasterVis) # Load the plotting library
library(RColorBrewer)
# Create the SpatRaster
climatch_raster <- climatch_plot(recipient = feow[16,], climdat = hist_clim, climatch = climatch_hist, provide_SpatRaster = TRUE)
ex.fe <- terra::ext(feow[16,]) # Grab extent for defining xlim and ylim
plotTheme <- rasterTheme(region=rev(brewer.pal(10,"RdBu")))
cmatch_lplot <- levelplot(climatch_raster, margin=F, par.settings=plotTheme,
xlim = ex.fe[1:2], ylim = ex.fe[3:4], maxpixels = 2e20)
cmatch_lplot
If global variance can be grabbed from the climate data and a source
is provided then climatch_plot() can act as a wrapper for
climate_vec(), and create the plot/SpatRaster.
par(mfrow =c(1,1)) # Change back to 1 row 1 column of plotting
climatch_plot(recipient = feow[16,], source = ast_oce_hist, climdat = hist_clim)
plot(feow[16,], add=T)To perform an assessment where climate match scores need to be
summarized across regions, we can use the climatch_sum()
function. There are currently two score types that can be specified with
the type argument, the default “perc” command summarizes
the climate match scores as the percentage of climatch scores within a
recipient >= a threshold of 6 (default), that can be changed (e.g.,
4,5,7) see [6,7]. “mean” provides the mean climatch score across the
region e.g., in [9].
# Summarize the climatch score within the Laurentian Great Lakes as percent match >= 6
climatch_sum(recipient = gl_hist, source = ast_oce_hist, globvar = gv_hist)
climatch_sum(recipient = gl_fut, source = ast_oce_hist, globvar = gv_hist)To determine the climate match across a combination of single or
multiple recipient and source regions, we can use the same function but
supply a list of data.frames for the regions. Once data are extracted,
run the climate match with climatch_sum() and assign the
values to the SpatVector using ‘$’. ‘tmap’ may give a warning with the
SpatVector so we can first convert to a SpatialPolygonsDataFrames with
terra::as() then plot. Plotting here is slower than the
climate matching and will likely take several minutes
# Extract data for all ecoregions
feow_rec <- extract_clim_data(climdat = hist_clim, locations = feow)
feow$feow_rec_cm <- climatch_sum(recipient = feow_rec, source = ast_oce_hist, globvar = gv_hist)
feow_spdf <- as(feow, 'Spatial') # tmap seems to prefer SPDF over SpatVector
# Create the plots
feow_spdf_plot <- tm_shape(feow_spdf) +
tm_graticules(alpha =.5, lwd = .03, labels.size = 0.8, n.y = 5, n.x = 5) + # Plots the grid i.e., graticules
tm_fill("feow_rec_cm", title = "Climatch (%)", # Fills the polygons
palette = "seq",
style = "cont",
breaks = seq(0, 100, by = 10),
legend.show = T) +
tm_layout(aes.palette = list(seq = "-RdYlBu"),legend.outside = TRUE) + # Defines colour palette and location of legend
tm_borders("black", lwd = .005, alpha=1) # Places an outer box.
feow_spdf_plot
If there is a need to run hundreds or thousands of climate matches,
e.g. for a horizon scanning or screening assessment of many species and
depending on the resolution of the climate data, it may be desirable to
run the climate matches in parallel across multiple CPUs to quicken the
process. Parallel processing is available with the
climatch_par() function. This function operates like the
others and can use either the climatch_sum() or
climatch_vec() functions. The ncores argument
specifies the number of CPU cores to utilize (default is 1); be careful
not to use too many cores otherwise your computer may crash. Typically,
a maximum of 1 less than the number of cores in your computer is
recommended.
As an example, we match multiple source ecoregions in the Neotropics to recipient ecoregions of Canada (any ecoregion that intersects). The same thing could be done with species’ occurrence records. In this example, we will parallelize each computation with three cores.
Then, we can visualize the results as a sort of “hot spot” analysis where we plot the number of matches above a certain percent climatch score for each recipient ecoregion. In a study of non-native freshwater fishes introduced to the Great Lakes, Howeth et al. [7] found that a climate match 71.7% was predictive of successful species establishment following introduction; therefore, we use 71.7% as our threshold to categorize high matches. We can also investigate how climate change may affect this by repeating the assessment with historical and projected climates. See Hubbard et al. [8] for details on these combinations when using regional sources (e.g., ecoregions, watersheds, GADM) instead of species occurrences.
# The vector of freshwater ecoregions ids that intersect with Canada. The ids from result of raster::intersect(canada, feow) (quite slow) where Canada is a polygon on of Canada
can_feow_id <- c("142", "118", "119", "116", "117", "114", "110", "113", "120", "109", "107", "108", "103", "104", "111", "105", "102", "106", "112", "115", "101")
canada_feow <- feow[feow$FEOW_ID %in% can_feow_id,]
# Create vector of ids for ecoregions in the neotopics https://www.feow.org/ecoregions/list?page=7
neotropic_feow_id <- as.character(c(201:216, 301:312))
neotropic_feow <- feow[feow$FEOW_ID %in% neotropic_feow_id,]
# Extract the data for historical
feow_canada_hist <- extract_clim_data(climdat = hist_clim, locations = canada_feow)
feow_neotropic_hist <- extract_clim_data(climdat = hist_clim, locations = neotropic_feow)
# Extract for climate change
feow_canada_fut <- extract_clim_data(climdat = CanESM_370_2070, locations = canada_feow)
feow_neotropic_fut <- extract_clim_data(climdat = CanESM_370_2070, locations = neotropic_feow)
# Run the climate matches 3 ways with historical and climate projections see Hubbard et al.[8] for details on these combinations
feow_can_match_hist <- climatch_par(recipient = feow_canada_hist, source = feow_neotropic_hist, globvar = gv_hist, ncores = 3, type = "perc", threshold = 6)
feow_can_match_hist_fut <- climatch_par(recipient = feow_canada_fut, source = feow_neotropic_hist, globvar = gv_hist, ncores = 3, type = "perc", threshold = 6)
feow_can_match_fut_fut <- climatch_par(recipient = feow_canada_fut, source = feow_neotropic_fut, globvar = gv_hist, ncores = 3, type = "perc", threshold = 6)
# We can use 'apply' with a simple function to count the number of matches > 71.7% or whatever threshold we decide
# And assign to our canada_feow SpatVector
canada_feow$count_can_hist <- apply(feow_can_match_hist, 2, function(x){sum(x>71.7)})
canada_feow$count_can_hist_fut <- apply(feow_can_match_hist_fut, 2, function(x){sum(x>71.7)})
canada_feow$count_can_fut_fut <- apply(feow_can_match_fut_fut, 2, function(x){sum(x>71.7)})
# Convert to spdf
canada_feow <- as(canada_feow, 'Spatial')
# Now plot these values
canada_feow_plot <- tm_shape(canada_feow, bbox = c(-177, 39, -45, 83)) +
tm_graticules(alpha =.5, lwd = .03, labels.size = 0.8, n.y = 5, n.x = 5) +
tm_fill(c("count_can_hist", "count_can_hist_fut", "count_can_fut_fut"),
palette = "seq", legend.show = T) +
tm_borders("black", lwd = .005, alpha=1) +
tm_layout(panel.show = T,
panel.labels = c("Both Historical", "Canada Future to Neotropic Historical", "Both Future"),
panel.label.size = 0.8,
aes.palette = list(seq = "-RdYlBu"),
legend.outside = TRUE)
canada_feow_plot
To cite package ‘Euclimatch’ in publications use:
Hubbard JAG, Drake DAR, Mandrak NE (2023). “Euclimatch: Euclidean Climatch Algorithm in R.” R package version 1.0.0, https://CRAN.R-project.org/package=Euclimatch.
A BibTeX entry for LaTeX users is
@Misc{, title = {Euclimatch: Euclidean Climatch Algorithm in R}, author = {Justin A. G. Hubbard and D. Andrew R. Drake and Nicholas E. Mandrak}, year = {2023}, note = {R package version 1.0.1}, url = {https://CRAN.R-project.org/package=Euclimatch}, }
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