Urban Regions : Ecology and Planning Beyond the City

Table

8.1

Case study evaluation of urbanization models using two attributes in two urban regions. Mosaic sequence maps for Mexico City and

Nant

es (Figures

8.3

and

8.4)a

re

superimposed on Color Figures

22

and

25,andthenumberofbiodiversitys

ites and length of rivers/major

streams covered by development is recorded for each of the three time stages portrayed by a model. For each attribute in each region the modelsare rankedfrombesttoworst(

1

to

4 )b

ased on the amount (low to high) of an attribute affected by urbanization, i.e., covered by development.

Concentric-zones model

Satellite-cities model

Transportation-corridors

model

Dispersed-sites model

Attribute measured

Stag

es

Stages

Stages

Stages

Urban region

1st

2nd

3rd

Total

1st

2nd

3rd

Total

1st

2nd

3rd

Total

1st

2nd

3rd

Total

Biodiversity sites (number affected by urbanization)

Mexico City

1

2

5

8

1

0

1

2

1

2

5

8

3

4

3

10

Model ranking

2.5

1

2.5

4

Nantes, France

0

1

2

3

0

0

0

0

0

0

2

2

2

1

3

6

Model ranking

312

4

Rivers/major streams (km length affected by urbanization)

Mexico City

0

0

0

0

23

11

14

48

1

1

11

13

0

0

2

2

Model ranking

143

2

Nantes, France

5

10

9

24

6

4

4

14

0

.5

.5

1

8

5

15

28

Model ranking

321

4