Table 1. Number of Amazonian tree species estimated to qualify as globally threatened under four IUCN threat status criteria.

Numbers of threatened species are nonoverlapping (that is, species listed for C1 did not qualify for A4). BAU = projected (including historical) deforestation through 2050 based on a BAU scenario (1, 2); IGS = projected (including historical) deforestation through 2050 based on an IGS (1, 2).

	Forest loss 1900–2013	Forest loss 1900–2050 (BAU)	Forest loss 1900–2050 (IGS)
Total number of species	15,200	15,200	15,200
Number of species with >30% observed population decline to date (IUCN A2)	1309	—	—
Number of species with >30% projected population decline over three generations (IUCN A4)	—	7033	3364
Number of species with >10% projected population decline over three generations and <10,000 individuals (IUCN C1)	—	38	44
Number of species with <1000 individuals (IUCN D1)	2505	1619	2107
Total number of threatened species	3814	8690	5515
Percentage of all species threatened	25	57	36