Understanding the deforestation wave and its consequences in
the Amazon basin forest
”,
´
By: Jose Manuel Ochoa-Quintero
Conservation Science Group
University of Cambridge
[email protected]
1. Identification of deforestation stages at local scale
1.1. The differentiation of the colonization stages/phases will be based
on deforestation rate.
Etter et al. 2006. Unplanned land
clearing of Colombian rainforest:
Spreading like disease?
Rodrigues et al. 2009. Boom-and-Bust
Development Across the Amazon
Deforestation Frontier
2. Social and economical aspects of deforestation stages
80
70
Income from the forest
•
Distance to local market
•
Farm extension
•
Land use in the farm
Cattle head
60
Forest proportion
•
50
40
Forest proportion
30
Human pop.
20
10
0
1
2
3
4
5
Years
6
7
8
3. Describe the characteristics of the remaining forest
patches and their biological meaning
3.1. Landscape metrics
3.2. Biological meaning
•
Contiguity index
•
•
Density index (No patches/100ha)
•
Percentage of forest interior
Phase III
Phase II
Changes on monkeys and
curassows communities
Phase I
4. Identification of hunting patterns
•
Relationship number of prey and
deforestation stage
•
Kilograms of biomass obtained from
birds and mammals
•
Distance travelled by hunters to get a
prey
Key aspects
•
To identify the forest fragmentation pattern associated to each
deforestation stage
•
To define how the community of curassows, forest rens and
monkeys are affected by this process
•
To understand some of the hunting patterns associated to the
deforestation stages
Some results
6
y = -0.0012x 2 + 0.1167x + 0.4575
R2 = 0.468
Log2(%def. rate 2005-2008 +1)
5
4
3
2
1
0
0
20
40
60
80
% Deforestation extent
n=390 squares of 10 by 10 km
100
Stages
Def. activity
Def. Extent
Number
A
0 to 0.3
<5%
50
B
0.3 to 3
<25%
70
C
>3
<40%
55
D
>3
40% to 60%
38
E
>3
60% to 100%
51
F
0.3 to
>75%
22
Largest patch index
Number of patches
Characteristics of the remaining forest patches
Stages
Kruskal-Wallis=2.2 e-16
A-B No significant difference test
B-E No significant difference test
Kruskal-Wallis=2.2 e-16
E-F No significant difference test
Cumulative area of forest patches according to
patch size in the different deforestation stages
12000
10000
100
C
60
D
E
40
F
20
8000
Forest patche sizes (ha)
B
80
6000
4000
2000
0
Forest fragment sizes
More
10000
9000
8000
7000
6000
5000
4000
3000
2000
900
1000
800
700
600
500
400
300
200
0
100
Cumulative percentage area
120
-10
0
10
20
30
40
50
60
-2000
Deforestation extent
70
80
90
100
B
C
D
E
F
Luciana de Souza Soler
Miriam Rothschild Scholarship
Prof. William Sutherland
Prof. Silvio de Barros Ferraz
Thank you for your attention