TABLE 6–2 Extinction of Species in Tropical Forests as Implied by Lovejoy and by Ehrlich and Ehrlicha

Source of Data and Region

Speices Present (thousands)

Projected Deforestation (%)

Loss of Speices (%)

Species Extinct (thousands)

Low Case

High Case

Low Case

High Case

Low Case

High Case

Lovejoy

Latin America

300–1,000

50

67

33

50

100–333

150–500

Africa

150–500

20

67

13

50

20–65

75–250

South and Southeast Asia

300–1,000

60

67

43

50

129–430

150–500

All tropics

750–2,500

47

67

33

50

249–828

375–1,250

Ehrlich and Ehrlich (1981)

Total (Annual rate of increase, 3.5%; current rate of extinctions, 1%)

50b

100c

 

 

 

Total (Annual rate of increase, 2%; current rate of extinctions, 3.5%)

50d

100e

 

 

 

a where D=depletion of diversity, =rate of depletion as a fraction of remaining diversity, r=rate of increase of e=constant, and t=time interval in years.

bBy early part of next century

cBy 2025.

dBy 2000.

eBy 2010.



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