Table 1. Richness and endemism indices for each ecoregion, as well as percent cover of urban and agricultural land uses, and membership in priority sets a. Map numbers correspond to those in Fig. 1.

Map no.
     Ecoregion name
Richness index
Endemism index
Urban cover (%)
Agric. cover (%)
Richness
sets b
Endemism
   setsc
  2
South Florida Rocklands
0.139
0.086
60.1
21.9
urban
urban
  6
Willamette Valley Forests
0.112
0.026
41.3
33.7


  7
Western Great Lakes Forests
0.163
0.012
  7.5
31.8


  8
Eastern Forest/Boreal Transition
0.153
0.003
  5.6
  4.1


  9
Upper Midwest Forest/Savanna Transition Zone
0.172
0.005
21.2
91.0


10
Southern Great Lakes Forests
0.203
0.010
30.5
76.9


11
Eastern Great Lakes Lowland Forests
0.164
0.002
29.6
40.0


12
New England/Acadian Forests
0.165
0.013
12.2
  5.7


13
Gulf of St. Lawrence Lowland Forests
0.101
0.000
23.8
18.4


14
Northeastern Coastal Forests
0.204
0.014
49.0
13.5
urban

15
Allegheny Highlands Forests
0.167
0.007
10.9
  2.5


16
Appalachian/Blue Ridge Forests
0.264
0.104
20.5
  8.0
urban
urban
17
Appalachian Mixed Mesophytic Forests
0.261
0.070
17.3
  5.7
urban
urban
18
Central U.S. Hardwood Forests
0.250
0.051
17.9
19.5
urban
urban
19
Ozark Mountain Forests
0.183
0.049
10.1
  5.6


20
Mississippi Lowland Forests
0.191
0.007
18.2
72.9
both

21
East Central Texas Forests
0.191
0.021
12.2
85.6
agric.

22
Southeastern Mixed Forests
0.267
0.057
20.9
16.6
urban
urban
23
Northern Pacific Coastal Forests
0.068
0.006
  1.5
  0.1


24
Queen Charlotte Islands
0.056
0.003
  0.4
  0.3


25
Northern British Columbia Mountain Forests
0.081
0.000
  1.1
  0.0


26
Alberta Mountain Forests
0.090
0.000
  1.9
  0.1


27
Fraser Plateau and Basin Complex
0.095
0.000
  3.2
  0.4


28
Northern Transitional Alpine Forests
0.075
0.000
  0.3
  0.0


29
Alberta/British Columbia Foothills Forests
0.094
0.000
  9.0
  5.5


30
North Central Rockies Forests
0.146
0.042
  3.8
  1.6


31
Okanogan Dry Forests
0.135
0.023
10.6
  3.1


32
Cascade Mountains Leeward Forests
0.106
0.002
  2.4
  1.5


33
British Columbia Mainland Coastal Forests
0.124
0.003
  1.6
  0.5


34
Central Pacific Coastal Forests
0.134
0.072
  7.1
  0.5


35
Puget Lowland Forests
0.111
0.024
47.8
  3.8


36
Central and Southern Cascades Forests
0.129
0.061
  2.2
  0.4


37
Eastern Cascades Forests
0.131
0.004
  3.9
  5.9


38
Blue Mountains Forests
0.124
0.039
  1.9
  3.6


39
Klamath-Siskiyou Forests
0.155
0.107
  5.9
  5.1


40
Northern California Coastal Forests
0.141
0.143
14.6
  0.5


41
Sierra Nevada Forests
0.158
0.143
  5.3
  0.4


42
Great Basin Montane Forests
0.099
0.062
  0.8
  0.7


43
South Central Rockies Forests
0.133
0.014
  2.1
  4.0


44
Wasatch and Uinta Montane Forests
0.135
0.018
  6.7
  2.6


45
Colorado Rockies Forests
0.157
0.014
  4.9
  0.5


46
Arizona Mountains Forests
0.180
0.074
  4.0
  0.4


47
Madrean Sky Islands Montane Forests
0.163
0.145
  2.2
  0.3


48
Piney Woods Forests
0.194
0.011
14.6
18.3


49
Atlantic Coastal Pine Barrens
0.143
0.014
53.9
54.8
both

50
Middle Atlantic Coastal Forests
0.225
0.024
23.6
49.1
both

51
Southeastern Conifer Forests
0.257
0.108
22.3
52.9
both
both
52
Florida Sand Pine Scrub
0.139
0.122
49.1
72.7
both
both
53
Palouse Grasslands
0.131
0.040
  8.3
24.1


54
California Central Valley Grasslands
0.101
0.053
27.0
30.1

both
55
Canadian Aspen Forest and Parklands
0.132
0.000
10.4
71.2


56
Northern Mixed Grasslands
0.164
0.000
  7.8
85.8


57
Montana Valley and Foothill Grasslands
0.132
0.010
  9.8
26.6


58
Northwestern Mixed Grasslands
0.173
0.007
  4.1
43.7


59
Northern Tall Grasslands
0.147
0.004
12.4
93.3


60
Central Tall Grasslands
0.182
0.004
14.5
95.9


61
Flint Hills Tall Grasslands
0.163
0.005
  7.0
22.4


62
Nebraska Sand Hills Mixed Grasslands
0.120
0.063
  2.2
27.0

agric.
63
Western Short Grasslands
0.232
0.034
  7.8
16.4


64
Central and Southern Mixed Grasslands
0.202
0.004
10.1
53.8


65
Central Forest/Grassland Transition Zone
0.256
0.020
17.6
54.9
both

66
Edwards Plateau Savannas
0.187
0.038
  8.0
57.1
agric.

67
Texas Blackland Prairies
0.209
0.033
27.2
55.8
both

68
Western Gulf Coastal Grasslands
0.254
0.035
26.8
65.2
both

69
Everglades
0.150
0.066
21.5
40.0

both
70
California Interior Chaparral and Woodlands
0.167
0.158
21.1
  2.3

urban
71
California Montane Chaparral and Woodlands
0.157
0.114
15.9
  2.1
urban
urban
72
California Coastal Sage and Chaparral
0.169
0.157
59.0
  0.3
urban
urban
75
Snake/Columbia Shrub Steppe
0.153
0.024
  6.8
11.8


76
Great Basin Shrub Steppe
0.169
0.066
  4.2
  1.0


77
Wyoming Basin Shrub Steppe
0.141
0.008
  5.2
  1.3


78
Colorado Plateau Shrublands
0.239
0.026
  5.3
  0.8


79
Mojave Desert
0.172
0.165
  8.3
  0.2


80
Sonoran Desert
0.202
0.139
12.0
  3.9


81
Chihuahuan Deserts
0.280
0.095
  5.6
  0.4


82
Tamaulipan Mezquital
0.192
0.057
12.9
49.7
agric.
agric.

Meand

0.162
0.043
14.4
23.4


1 SD

0.051
0.047
14.3
28.6


    
a This table reports raw (untransformed) values. For regression and quantile analyses that follow, data are transformed as described in Methods.     
b Ecoregions that rank in the top third for both richness index and for measures of urbanization, agriculture, or both.     
c Ecoregions that rank in the top third for both endemism index and for measures of urbanization, agriculture, or both.     
d A simple arithmetic mean, not weighted by ecoregion area.