Foraging Activity of Native Ants on Trees in Forest Fragments Colonized by the Invasive Ant Lasius neglectus

Figure 1

The University campus is composed by three main units. The first unit comprises all the university and transportation infrastructure like buildings, parkings, railway stations, roads, and paths. The agroforestal unit is composed by natural areas such as mixed and pine forests, shrubland, grassland and reedbed. Finally, the gardened unit included grass areas with several isolated trees and bushes. The area of the campus invaded by L. neglectus is surrounded by a black line. On the right side, areas (a, b, and c) of the chosen invaded (dotted line) and control (continuous line) forest fragments have been enlarged. Isolated trees are shown with small white circles. The arrow, in figure (b) points a roundabout where there are five isolated trees colonized by L. neglectus.