Global Nature Fragmentation
Transcript of Global Nature Fragmentation
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