Urbanisation is related to the prevalence of threatened species on islands across the globe

Aim
To assess how environmental characteristics and human impacts contribute to the global prevalence of threatened bird species on islands globally, and to identify which types of anthropogenic land use are most strongly associated with extinction risk on islands.
Location
Global
Time period
Present-day extant species and land-use patterns
Major taxa studied
Terrestrial birds
Methods
We compiled bird species occurrence and conservation status data from BirdLife International and eBird, alongside environmental and land-use variables for islands. We grouped nine predictor variables into three categories: island characteristics (e.g., area, isolation, climate), human impacts (urban cover, cropland, human appropriation of NPP), and wildlands (intact habitat). Using model selection and BIC-based model weights, we evaluated the relative support for each variable group and assessed which factors best explained the prevalence of threatened species (i.e., the proportion of threatened to non-thr..., , Data_binom_unscaled.csv - table with the raw data used for the analysis\
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Data_binom.csv - table with the data scaled used for the analysis

script_GEBsubmission.R - script containing all the analysis of this study

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ulm_id - unique id number of each island. The ulm_id follows the data extracted from Weigelt el al. 2013
all_sp - total number of species present in the island
Temperature - mean annual temperature registered in the island (Celsius)
Precip- mean annual precipitation registered in the island (milimiters)
Arealog - total island area (log transformed)
Elevlog - mean elevation of the island (log transformed)
Distlog - linear distance between the island and the continent (log transformed)
NPPlog - mean net primary productivity in the island (log transformed)
GMMCfact and GMMCisl- Last Maximum Glacial Connection to mainland, binomial variable (0= not connected, 1= connected)

n_threat_noNT - number of threatened species registered (Red list categories= VU,EN, CR) in the isl...,