Spatial sampling strategy

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Spatial sampling strategy. MODIRISK. Basis for sampling strategy. Grid of 10X10 km = 326 cells Three samples per grid cell = 978 samples Take into consideration: Major biotopes Seasonal variation Import risk . Proposed procedure.

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Spatial sampling strategy

MODIRISK

Basis for sampling strategy
• Grid of 10X10 km = 326 cells
• Three samples per grid cell = 978 samples
• Take into consideration:
• Major biotopes
• Seasonal variation
• Import risk

MODIRISK Kick-off-meeting

Proposed procedure
• Identify key habitats based on Corine LC classes by aggregating urban, agriculture, natural and import risk classes.
• Calculate total surface per aggregated class
• Assign proportional number of sample points to aggregated class.
• Generate appropriate number of random sampling points within each class.
• Randomly assign sampling points within each class to two sampling seasons.
• Geocode and assign sample sites per team.

MODIRISK Kick-off-meeting

Aggregation of CORINE LC data
• CORINE includes 50 classes divided in five groups:
• Artificial surfaces including urban and industrial
• Agriculture areas
• Forest and semi natural areas
• Wetlands
• Water bodies

MODIRISK Kick-off-meeting

Corine data – 50 classes

MODIRISK Kick-off-meeting

Class aggregation
• (1) Urban biotopes
• (2) Land in the agriculture cycle
• (3) Natural terrestrial habitats
• (4) Risk of introduction areas: ports, airports, dump sites, moors and heat land, inland marshes, salt marshes
• (5) Areas excluded from sample: industrial and commercial units, roads, mines and mineral extraction sites, construction sites, sparsely vegetated areas
• (6) Water bodies

MODIRISK Kick-off-meeting

Corine - 6 aggregated classes

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Sample size per aggregated class

In blue = automated random assignment

In red = manual attribution in selected areas

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173 random urban sampling points

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564 random agri sampling points

MODIRISK Kick-off-meeting

199 random natural sampling points

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Non-random sampling points
• Not yet included in map
• 42 sampling points to be allocated in areas representing a particular risk of introduction: ports, airports, dump sites, moors and heat land, inland marshes, salt marshes.
• Additional samplings should also be conducted in other selected areas:
• Zoos and safari parks (list available)
• Second hand tire import/storage (list to be established)
• Protected areas involving presence of large numbers of migratory birds (list available)

MODIRISK Kick-off-meeting

Sample: institute / year / season

MODIRISK Kick-off-meeting

Sample per institute
• Rough division by province:
• ITG (274 + 42): Antwerp, Limburg, Brabant
• KBIN (293): Oost Vlaanderen, West Vlaanderen, Brabant
• UCL (365): Hainaut, Namur, Luxembourg
• Needs reassessment !!!

MODIRISK Kick-off-meeting

Data base
• Flexibility to re-allocate sampling areas
• Geocode random sampling points to nearest relevant feature to ease sampling: road access, street names, house numbers, …
• UTM numbering grid cells according to standard

MODIRISK Kick-off-meeting

Web based MODIRISK survey map
• Online map (Google map) with status of field survey per team
• Public access: important dissemination purpose because most urban samples will be conducted in house gardens
• Link to entomological data base  future link with biodiversity data base
• Password protected centralized data entry using Palmtop:
• Field forms
• Entomology forms
• Cross check forms
• Generate addresses in urban areas to contact prior to sampling

MODIRISK Kick-off-meeting

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