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Improving the early detection of alien wood‐boring beetles in ports and surrounding forests

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International ports are generally considered the most likely points of entry for alien wood‐boring beetles. A better understanding of the factors affecting their arrival and establishment at ports and their surrounding areas is of utmost importance to improve the efficacy and the cost‐effectiveness of early detection programmes. Our work aimed at understanding how port size and the characteristics of the landscape surrounding the port, in terms of forest cover and forest composition, influence the occurrence of alien wood‐boring beetles. From May to September 2012, 15 Italian international ports and the surrounding forests were monitored with multi‐funnel traps baited with a multi‐lure blend (α‐pinene, ethanol, ipsdienol, ipsenol, methyl‐butenol), three in each port and three in forests located 3–5┬ákm away from the port. We identified both alien and native Scolytinae, Cerambycidae and Buprestidae beetles. Fourteen alien species, among which four are new to Italy, were trapped. Alien species richness was positively related to the amount of imported commodities at the port scale. Broadleaf forests surrounding ports received larger number of alien species than conifer forests. By contrast, total forest cover in the landscape surrounding ports was positively related to the occurrence of native but not alien species. The alien and native species richness was higher in the surrounding forests than in the ports. Synthesis and applications. The simultaneous use of traps in ports with large volume of imported commodities and in their surrounding broadleaf forests can strongly increase the probability of alien wood‐boring beetle interceptions. The identification of sites where the arrival and establishment of alien species is more probable, combined with an efficient trapping protocol, can substantially improve the efficacy of early detection. Similar approaches may be used in other countries as early warning systems to implement timely measures to eradicate or contain alien invasions at the European scale.
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Keywords: bark beetles; exotic species; forest pests; invasion; jewel beetles; landscape; longhorn beetles; monitoring; species interception; surveillance

Document Type: Research Article

Publication date: February 1, 2015

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