Combined effects of bird extinctions and introductions in oceanic islands: decreased functional diversity despite increased species richness

Two databases are included in this file: a sites x species matrix composed of 74 oceanic islands for which a list of known breeding bird species was compiled (including extinct, extirpated and established introduced species); and a species x trait matrix which includes information on body mass, foraging time, diet, foraging strata, volancy and habitat for each species (n = 759).