Figure 1
From: Tracking the invasive hornet Vespa velutina in complex environments by means of a harmonic radar
Example of V. velutina tracking session with the harmonic radar in the invasive outbreak of Arcola (La Spezia, Italy). V. velutina workers were tagged (n = 14) in the apiary close to the first radar position (the easternmost apiary on the map). Subsequently, the harmonic radar was moved accordingly to the flying direction of hornets in other six positions (triangles). Different colours highlight the recorded tracks (n = 46) in relation to each radar position. The red dot indicates the position of the discovered nest of V. velutina. Background map by Google Maps (maps.google.com).
