BBS - Results - USGS Patuxent Wildlife Research Center

Source:
Droege, Sam. 1990. The North American Breeding Bird Survey. pages 1-4. in J.R. Sauer and S. Droege, eds. Survey designs and statistical methods for the estimation of avian population trends. USFWS Biological Report 90(1). 160 pp. As modified from --
Bystrak, Danny. 1981. The North American Breeding Bird Survey. pages 34-41. in C.J. Ralph and J.M. Scott, eds. Estimating numbers of terrestrial birds. Studies in Avian Biology No. 6. 630 pp.

Stratum	Name	Area Km2	Stratum	Name	Area Km2
01	Subtropical	18226	37	Drift Prairie�	247060
02	Floridian	63636	38	Glaciated Missouri Plateau	275586
03	Coastal Flatwoods	157110	39	Great Plains Roughlands	369965
04	Upper Coastal Plain	513884	40	Black Prairie	147060
05	Mississippi Alluvial Plain	109126	53	Edward's Plateau	78516
06	Coastal Prairies	73804	54	Rolling Red Plains	114084
07	South Texas Brushlands	86369	55	Staked Plains	129818
08	East Texas Prairies�	105115	56	Chihuahuan Desert	163419
09	Glaciated Coastal Plains	5825	61	Black Hills	14751
10	Northern Piedmont	32820	62	Southern Rockies	133649
11	Southern Piedmont	169837	63	Fraser Plateau	116550
12	Southern New England	37809	64	Central Rockies	423978
13	Ridge and Valley	144262	65	Dissected Rockies	177208
14	Highland Rim�	120800	66	Sierra Nevada�	56957
15	Lexington Plain	54468	67	Cascade Mountains	54750
16	Great Lakes Plain�	181176	68	Northern Rockies	697047
17	Driftless Area	59773	80	Great Basin Deserts	152983
18	St. Lawrence River Plain	99163	81	Mexican Highlands	74592
19	Ozark/Ouachita Plateau	158213	82	Sonoran Deserts	109878
20	Great Lakes Transition	108992	83	Mojave Desert	86597
21	Cumberland Plateau	52889	84	Pinyon/Juniper Woodlands	195587
22	Ohio Hills	76926	85	Pitt-Klamath Plateau	69199
23	Blue Ridge Mountains	40059	86	Wyoming Basin	122850
24	Allegheny Plateau�	133238	87	Intermountain Grasslands	318697
25	Open Boreal Forest�	169844	88	Basin and Range	212123
26	Adirondack Mountains	24872	89	Columbia Plateau	238601
27	Northern New England	52412	90	Southern California Grasslands	35398
28	Northern Spruce/Hardwoods	609324	91	Central Valley	55991
29	Closed Boreal Forest	1025965	92	California Foothills	79642
30	Aspen Parklands	358734	93	Southern Pacific Rainforests	134742
31	Till Plains	201004	94	Northern Pacific Rainforests	138246
32	Dissected Till Plains	228855	95	Los Angeles Ranges	5470
33	Osage Plain/Cross Timbers	154162	96	Southern Alaska Coast	NA
34	High Plains Border	166823	98	Willamette Lowlands	12934
35	Rolling Red Prairies	90164	99	Tundra	NA
36	High Plains	236133