Table 1. Percentages of threatened taxa with lower heterozygosity than taxonomically related nonthreatened taxa (H_t < H_nt) in a range of major taxa and the magnitudes of those differences.

Taxon	Ht < Hnt, %	Median difference, %	Mean difference, %	n	P
All	77	40	35	170	<0.0005
Animals	78	38	35	134	<0.0005
Vertebrates	78	35	35	129	<0.0005
Homeotherms	81	43	40	94	<0.0005
Mammals	84	46	42	63	<0.0005
Birds	74	40	35	31	0.001
Poikilotherms	69	26	20	35	0.001
Invertebrates	80	67	37	5	0.140
Plants	75	57	38	36	<0.0005
Angiosperms	81	58	40	21	0.005
Gymnosperms	67	51	35	15	0.012

n, Number of threatened taxa; P, probabilities based on Wilcoxon's signed rank tests.