Data from: Alien species richness is currently unbounded in all but the most urbanized bird communities

Toby P. Tsang, Ellie E. Dyer & Tim C. Bonebrake
Urban areas suffer high pressure of introductions of alien species compared to other habitats due to intensive human activities. As trading globally continues to rise, more species will likely be introduced into urban areas. To determine whether this increase in introduction pressure will lead to increased alien species richness in urban areas, or whether other processes would act to impose an upper limit on species richness, we examined how the shape of the relationship between...
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