Niche Climate Exposure.

climniche

Website: https://bohao0813.github.io/climniche/

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climniche quantifies niche climate exposure: the amount and direction of projected climate change at cells currently associated with a taxon, measured relative to its realised climatic niche.

climniche separates four quantities in exposure maps:

• climate_change_amount: how far climate moves between the current and future period;
• niche_distance_change: whether future climate becomes closer to or farther from the realised niche centre;
• composition_change: change in climate composition that does not mainly alter distance from the niche centre;
• outside_niche_exceedance: how far future climate lies beyond an empirical boundary of current niche conditions.

Together, these quantities distinguish local environmental change from change that moves current occurrence, range, or SDM cells outside the realised niche.

Inputs and outputs

climniche accepts extracted environmental matrices and aligned raster or terra layers. The current reference cells can be supplied as occurrences, a range raster, or a continuous SDM suitability raster with a chosen threshold.

The outputs are cell-level tables, maps, exposure classes, variable contributions, report text, and figure data.

Basic use

library(climniche)

sim <- simulate_climniche()

fit <- fit_climniche(
  current = sim$current,
  future = sim$future_away,
  occupied = sim$occupied,
  center = sim$center,
  sensitivity = sim$sensitivity
)

climniche_summary(fit)
climniche_report(fit, species = "example species")
plot_climniche_diagram(fit)

For spatial data, use fit_climniche_raster() or fit_climniche_terra(). Both functions accept binary and continuous occupied rasters. domain can be used to restrict the calculation to a study area such as a marine region or a modelled accessible area.