Data S1 Supplementary Methods.

Figure S1 Showing the relationship between isolation and number of species for islands of different sizes in analogue to Fig. 2 of the main text.

Figure S2 A colour map showing species richness for immigrant, anagenetic and cladogenetic species as a function of area J and isolation m.

Figure S3 Species abundances in abundance classes as a function of isolation.

Table S1 Status of bird species found across archipelagoes and islands.

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