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Forensic reconstruction of Ictalurus punctatus invasion in the Guadiana river drainage, based on online and literature records. Arrows indicate dispersal direction and the associated letter describes the probable means of dispersal (A – active dispersal; H – human translocation; F – dam constructed in previously flooded area by a downstream dam). River distance in kilometers between successive locations and year of first detection for each location were given in corresponding stretch of river and location.
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