global nature fragmentation
TRANSCRIPT
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Global Nature Fragmentation
Jan Clement
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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
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Wildlife population
Author: Rodney van der Ree
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Habitat lost
Habitat fragmented
Barrier often formed (avoidance, mortality)
Behaviour altered
Risk of extinction increases
Author: Rodney van der Ree
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Wildlife crossing structures
Author: Rodney van der Ree
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Global Land Cover 2000
� Grid size of 1 km2� Original 23 classes of land cover
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Aggregated version of GLC2000
� Nature, Urban Agriculture and Water � Majority patches of area > 5km2 nature� Area corrected for location on Earth
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Dutch Landcover GLC-AgregatedExtra urban from Night Time Light (traffic centers)
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Night Time Light satellite imagery
� Economic activity gives light (GDP)� Light is proxy for traffic intensity� 75.000 urban light centers (cities)
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Big cities based on light intensity
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Light in the Netherlands� almost no place without any light
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Light and roads
� Roads connect citys
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InterUrban networks routes
� Big cities gives much traffic
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Exampe how fragmentation works
Veluwe patch with 0.5 cell
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Big roads on the Veluwe
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The resulting patches
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Classification of patches
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Pseudo patches in 0.5 cells� Max biodiversity 100 % in 0.5 cell
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Biodiversity index based on fragmentation
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Biodiversity index based on fragmentation Europe