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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. - PowerPoint PPT Presentation
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Understanding the deforestation wave and its consequences in
the Amazon basin forest”,
By: Jose Manuel Ochoa-QuinteroConservation 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
• Income from the forest
• Distance to local market
• Farm extension
• Land use in the farm
0
10
20
30
40
50
60
70
80
1 2 3 4 5 6 7 8
Years
Fo
res
t p
rop
ort
ion
Forest proportion
Human pop.
Cattle head
3. Describe the characteristics of the remaining forest patches and their biological meaning
3.1. Landscape metrics
• Contiguity index
• Density index (No patches/100ha)
• Percentage of forest interior
3.2. Biological meaning
• Changes on monkeys and
curassows communities
Phase IPhase IIPhase III
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
y = -0.0012x2 + 0.1167x + 0.4575
R2 = 0.468
0
1
2
3
4
5
6
0 20 40 60 80 100
% Deforestation extent
Lo
g2(
%d
ef.
rate
200
5-20
08 +
1)
n=390 squares of 10 by 10 km
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
Characteristics of the remaining forest patches
Stages
Nu
mb
er o
f p
atch
es
Lar
ges
t p
atch
in
dex
Kruskal-Wallis=2.2 e-16 Kruskal-Wallis=2.2 e-16
A-B No significant difference testB-E No significant difference test
E-F No significant difference test
-2000
0
2000
4000
6000
8000
10000
12000
-10 0 10 20 30 40 50 60 70 80 90 100
Deforestation extentF
ore
st
pat
ch
e s
izes
(ha)
Cumulative area of forest patches according to patch size in the different deforestation stages
0
20
40
60
80
100
120
100
200
300
400
500
600
700
800
900
1000
2000
3000
4000
5000
6000
7000
8000
9000
1000
0
Mor
e
Forest fragment sizes
Cu
mu
lati
ve p
erce
nta
ge
area
B
C
D
E
F
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