Spatial pattern analyses across Africa for a better ... · PDF file"Biodiversity of Africa ......
Transcript of Spatial pattern analyses across Africa for a better ... · PDF file"Biodiversity of Africa ......
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Wegmann, M., Magidi, J., Lung, T., Schaab, G., Krug, C., Knight R., Wegmann, M., Magidi, J., Lung, T., Schaab, G., Krug, C., Knight R., Sommer, J. H., Sabellek, K., Fahr, J., Herkt, M., Barnikel, G., Penner, J., Sommer, J. H., Sabellek, K., Fahr, J., Herkt, M., Barnikel, G., Penner, J., Rödel, M.-O., Keil, M., Landmann, T., Schmidt, M.Rödel, M.-O., Keil, M., Landmann, T., Schmidt, M.
Spatial pattern analyses across Africa for aSpatial pattern analyses across Africa for a
better understanding of biodiversity patterns better understanding of biodiversity patterns
using remote sensingusing remote sensing
"Biodiversity of Africa - Observation and Sustainable Management for our Future!" International Congress, 29 September – 3 October 2008, at Spier, RSA
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Remote Sensing data• temporal as well as spatial resolution improved, therefore:
• improved discrimination of landcover through phenology (e.g. MODIS)
• improved mapping of land cover change
NDVI time-series
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Remote Sensing data
land cover maps distribution of habitats
land cover change maps dynamics of habitats for species
…but spatial attributes of the fragments provide further relevant ecological information on suitability of potential habitats
GMES, SEBI
• temporal as well as spatial resolution improved, therefore:
• improved discrimination of landcover through phenology (e.g. MODIS)
• improved mapping of land cover change
NDVI time-series
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Spatial attributes
same area of landcover but different spatial arrangement
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fragments might be inappropriate for a species:
Spatial attributes
same area of landcover but different spatial arrangement
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Spatial attributes
same area of landcover but different spatial arrangement
• too small
fragments might be inappropriate for a species:
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Spatial attributes
same area of landcover but different spatial arrangement
• too small
• complex shape
fragments might be inappropriate for a species:
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Spatial attributes
same area of landcover but different spatial arrangement
• too small
• complex shape
• too isolated
spatial attributes are important for land management and conservation planning
fragments might be inappropriate for a species:
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talk 3.3
Ecosystems need a minimum of spatial integrity to deliver their services:
- fragmentation results in e.g. smaller patch areas (e.g. edge effects) and decreased connectivity
altered species distribution & species communities
- spatial pattern analysis is essential for species distribution models and resulting suggestions for protected area networks
Importance of spatial composition
talk 1.4
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Potential forest distribution using a spatial prediction modelling approach with e.g. precipitation, temperature, soil and elevation data
Maxent 3.0.1, 18 variables, n=1000
Fragmentation of pristine areas
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Actual rainforest cover (MODIS, 2001-2006)> 80% loss in rainforest cover; highly fragmented
Classification tree, MOD09 1000m, 2001-2006
Fragmentation of pristine areas
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1913194819842003
Aerial photography, Landsat MSS, (E)TM
talk 2.3
Fragmentation of pristine areasKakamega-Nandi Forests
60% loss in natural forest cover since 1913
forest fragmentation
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Sandveld (1990-2007) Sand Fynbos and Strandveld
fragmentation
Landsat MSS, (E)TM199020042007
poster
Fragmentation of pristine areas
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Analysis of spatial patternsFragmentation of pristine areas
Patches: smaller, complex shapes, reduced connectivity
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Analysis of spatial patternsFragmentation of pristine areas
Patches: smaller, complex shapes, reduced connectivity
How to analyse spatial patterns with respect to ecological relevance?
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Analysis of spatial patternsFragmentation of pristine areas
Patches: smaller, complex shapes, reduced connectivity
single patch: e.g. area, SHAPE
indices
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Analysis of spatial patternsFragmentation of pristine areas
Patches: smaller, complex shapes, reduced connectivity
single patch: e.g. area, SHAPE
patch connectivity: e.g. distance between patches
indices
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Various software packages serve the purpose to analyse spatial patterns (e.g. Fragstats)
semi-automatic processing implemented in a GIS potential to modify/implement algorithms
In-house software development for spatial analysis
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r.pi (raster patch index)
- basic analysis (SHAPE, asymmetry, fractal-Index)- Connectivity analysis
- k-ENN (Euklidean Nearest Neighbours)- Omnidirectional Connectivity
In-house software development for spatial analysis
Various software packages serve the purpose to analyse spatial patterns (e.g. Fragstats)
semi-automatic processing implemented in a GIS potential to modify/implement algorithms
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In-house software development for spatial analysis
r.pi (raster patch index)
- basic analysis (SHAPE, asymmetry, fractal-Index)- Connectivity analysis
- k-ENN (Euklidean Nearest Neighbours)- Omnidirectional Connectivity
Considering the environmental attributes:- k-FNN (Functional/ecological NN)- individual-based metrics
- (Im-)Migration- Searchtime
Various software packages serve the purpose to analyse spatial patterns (e.g. Fragstats)
semi-automatic processing implemented in a GIS potential to modify/implement algorithms
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In-house software development for spatial analysis
Various software packages serve the purpose to analyse spatial patterns (e.g. Fragstats)
semi-automatic processing implemented in a GIS potential to modify/implement algorithms
r.pi (raster patch index)
- basic analysis (SHAPE, asymmetry, fractal-Index)- Connectivity analysis
- k-ENN (Euklidean Nearest Neighbours)- Omnidirectional Connectivity
Considering the environmental attributes:- k-FNN (Functional/ecological NN)- individual-based metrics
- (Im-)Migration- Searchtime
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A
B
C
Influenced by:
- perception range
- attractiveness of patches
Connectivity: Searchtime
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Connectivity: Searchtime
A
B
C
Influenced by:
- perception range
- attractiveness of patches
A
B
C
additionally:
- …
- env. suitability
- env. costs
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Connectivity: Searchtime
average Searchtime, individuals/patch=10000
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Iterative removal of patch x and assign differences of searchtime of all other patches.
Patch contribution to connectivity
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Differences in searchtime after removal of patch B
A
B
C
Searchtime
- with all patches in the landscape
A
B
C
Diff. in searchtime
- each patch iteratively removed from the landscape
Patch contribution to connectivity
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small agglomerated rainforest remnants in West Africa contribute less to sustaining connectivity than larger patches but are nevertheless important
Differences in average Searchtime, individuals/patch=10000
Patch contribution to connectivity
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• development of new spatial algorithms software (OpenSource) • spatial pattern analysis created value for BIOTA
– assessment of patch relevance for conservation planning– improvement in species distribution models
(e.g. overestimation)…– usefulness of this analysis in South Africa and Mexico for
conservation planning & resource management (SANBI, CONABIO)
Application & Outlook
talk 1.4
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... and beyond?
– the spatial analysis can be extended to a global biodiversity monitoring scheme using remote sensing in order to:
– track near real-times spatial ecosystem changes– identify biodiversity threats through
– increased edge effects– isolation of remnants etc.
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... and beyond?
– the spatial analysis can be extended to a global biodiversity monitoring scheme using remote sensing in order to:
– track near real-times spatial ecosystem changes– identify biodiversity threats through
– increased edge effects– isolation of remnants etc.
– the spatial analysis can be improved from being based on categorical landcover to continuous information about landcover like
– fractional cover – quality of cover (e.g. degradation) talk 1.3
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