Abundance of Rift Valley Fever vectors in Europe and the Mediterranean Basin Ducheyne E., Versteirt V. & Hendrickx G.

Rift Valley Fever, Europe, Mediterranean Basin, Culex pipiens, Aedes vexans, abundance models
First published in EFSA Supporting Publications
26 April 2013
External Scientific Report

Outbreaks of RVF often occur linked to periodical abundance peaks of Aedes and Culex species. Abundance data is therefore critical but needs a specific approach. A novel methodology was developed to model spatial abundance patterns for two potential vectors (Aedes vexans and Culex pipiens) of Rift Valley Fever in Europe and the Mediterranean Basin. For those two species, abundance data was extracted from the compiled papers and subdivided into three categories; low, medium and high abundances. Only geocoded records could be used in the modelling approach. The categories were based on a log-transformation where the low class are sites with 1-10 specimen per trap, medium class sites with 10-1000 specimens and high all sites with more than 1000 specimen per trap. Models were created using Random Classification Forests for each of the classes separately and then combined with a maximum value compositing procedure. In a final step, the abundance map was combined with the probability map. Abundance models could only be created for Cx pipiens as detailed abundance data was lacking for Aedes vexans. Although it has some drawbacks, the proposed methodology has proven to be a useful approach when only scattered literature data is available. © 2013 Avia-GIS.

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