Understanding the deforestation wave and its consequences in

the Amazon basin forest”,

By: Jose Manuel Ochoa-QuinteroConservation Science Group

University of Cambridge jmo34@cam.ac.uk

´

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