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Table 3: 1970 to 1990 Population Increase in the
Sonoran Desert
Biotic Community* |
1970 Population |
1970 Population Density
(#/km2) |
1990 Population |
1990 Population Density
(#/km2) |
% Change |
| AZ Upland / Lower Colorado |
2,505,211 |
9.7 |
5,149,766 |
18.7 |
106 |
| Semidesert Grassland |
17,589 |
2.6 |
32,778 |
4.9 |
86 |
| Plains of Sonora |
253,628 |
12.7 |
508,914 |
25.6 |
101 |
| Central Gulf Coast |
4,134 |
0.4 |
7,683 |
0.6 |
86 |
| Foothills and Coastal Thornscrub |
472,648 |
13.4 |
743,761 |
21.1 |
57 |
| Viscaino |
33,092 |
1.7 |
38,528 |
2.0 |
16 |
| Magdalena Plain |
32,260 |
1.9 |
65,969 |
3.9 |
104 |
| Mixed |
188,815 |
3.1 |
392,432 |
6.4 |
108 |
| Total |
3,507,377 |
9.8 |
6,939,831 |
19.5 |
98 |
Counties were grouped by Brown and Lowe 1980 biotic communities
when the particular biotic community occupied greater than 60% of
each county or municipio's area. The Central Gulf Coast, Viscaino,
and Magdalena Plain are represented largely by one municipio each,
while other communities are represented by 3-13 counties or municipios.
The mixed category includes counties that include multiple biotic
communities, sometimes mixed with higher elevation oak woodland.
However, the bulk of population growth has occurred below the oak
woodland communities.
Sources: Direccion General de Estatistica. 1971a; Direccion General
de Estatistica 1971b; Direccion General de Estatistica 1971c; INEGI
1991b; Baja California 1992; Lorey, D.E. 1993; U.S. Government Printing
Office 1971; U.S. Dept. of Commerce 1992.
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