Global Nature Fragmentation

Jan Clement

Introduction and problem definition

� Fragmentation of habitats (MVP/MAR)� Aggregation of GLC2000 (nature patches)� Night time satellite imagery (proxy)� InterUrban networks routes (Arcinfo route)� Traffic intensity (negexp/GDP/POP)� Biodiversity index (for 0.5x0.5 cells)� discussion

Wildlife population

Author: Rodney van der Ree

Habitat lost

Habitat fragmented

Barrier often formed (avoidance, mortality)

Behaviour altered

Risk of extinction increases

Author: Rodney van der Ree

Wildlife crossing structures

Author: Rodney van der Ree

Global Land Cover 2000

� Grid size of 1 km2� Original 23 classes of land cover

Aggregated version of GLC2000

� Nature, Urban Agriculture and Water � Majority patches of area > 5km2 nature� Area corrected for location on Earth

Dutch Landcover GLC-AgregatedExtra urban from Night Time Light (traffic centers)

Night Time Light satellite imagery

� Economic activity gives light (GDP)� Light is proxy for traffic intensity� 75.000 urban light centers (cities)

Big cities based on light intensity

Light in the Netherlands� almost no place without any light

Light and roads

� Roads connect citys

InterUrban networks routes

� Big cities gives much traffic

Exampe how fragmentation works

Veluwe patch with 0.5 cell

Big roads on the Veluwe

The resulting patches

Classification of patches

Pseudo patches in 0.5 cells� Max biodiversity 100 % in 0.5 cell

Biodiversity index based on fragmentation

Biodiversity index based on fragmentation Europe