Identifying optimal locations to install permanent Chinese mitten crab traps in East Flanders
The Chinese mitten crab is a widespread invasive alien species. To mitigate its impacts,
eƯective management measures, such as the deployment of permanent traps, are essential. To
date, however, an objective method for selecting sites for this costly infrastructure has been
lacking. This study aims to objectify the site selection process by systematically evaluating
potential locations using an assessment protocol to prioritize the most suitable sites.
A two-tiered approach was implemented for this purpose. First, a macro-level analysis was
conducted through data acquisition, a GIS analysis, and the use of a decision tree. The resulting
locations were subsequently validated using the assessment protocol to evaluate their local
suitability on-site.
The evaluation yielded locations with varying scores. Two sites achieved the maximum 'A'
score, indicating they theoretically oƯer the highest potential for installing permanent traps in
the future. No critically poor locations were identified, with a 'C' score being the lowest
recorded. This indicates that the pre-study serves as a reliable initial filter. Nevertheless, the
field evaluations exposed several contradictions and redundancies within the protocol,
particularly regarding parameters such as flow velocity, permitting procedures, and private
property access.
In conclusion, combining a GIS pre-study with the (originally British) assessment protocol
proves to be an eƯective methodology for site selection, given that no truly poor locations were
identified. Provided that minor adjustments are made to align the protocol with the Flemish
context, this workflow oƯers a good framework. Through this approach, poor site-selection can
be avoided, and investments can be made where they are eƯectively needed.
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