Table S2.

Classification of regions (see Fig. S1)

Region ID	Region
N_AMER	North America (excluding Hawaii)
HAWAII	Hawaii
CEN_AMER	Central America (including the Caribbean)
GALAP	Galapagos
S_AMER	South America (excluding Galapagos)
AFRI	Africa (excluding islands listed below)
W_AFRI_IS	West African islands (Canary Islands, Cape Verde, Sao Tome, Equatorial Guinea)
MADA	Madagascar region (Madagascar, Comoros, Mayotte, Seychelles, Mauritius, Reunion Islands)
EUR	Europe
ASIA_EW	Asia (excluding Southeast Asia)
SE_ASIA	Southeast Asia (including Christmas Island)
AUS	Australia (Australia, excluding Christmas Island, Macquarie Island, and Heard and McDonald Islands)
MICRO	Micro-/Mela-/Polynesia
NZ	New Zealand (excluding sub-Antarctic islands)
AMSTER	Amsterdam and St. Paul Islands
SUB_ANT	Antarctica and sub-Antarctic islands (Antipodes, Auckland, Bounty, Bouvet, Campbell, Crozet, Heard and McDonald, Kerguelen, Macquarie, Prince Edward, South Georgia, South Sandwich, Snares)
StHEL	St. Helena, Ascension, and Tristan da Cunha
MULTI	Species occurs within multiple regions.

Items in column 1 refer to the region IDs used in Dataset S1. We did not include the nonbreeding ranges of pelagic seabirds and turtles in regional classifications.