L. neglectus has a negative impact on native ant species in Hungary, notably by excluding other species from colony centers. The invasive garden ant has been shown to be highly aggressive against native Lasius ants in Spain, who despite their bigger size show avoidance behavior much more often than L. neglectus.
Concerning the impact of the invasive ant on local insects in Spain comparatively to native ants, studies have shown that a higher percentage of native Lasius grandis workers carry insects, but the repercussions on the insect fauna could be similar for the invasive ant, as they are in greater number. Specifically, no difference was found between the abundance of insects on trees visited by L. neglectus and trees visited by L. grandis, except for Coccinellidae larvae, which were 76% less abundant in L. neglectus trees that in L. grandis visited trees.
L. neglectus has also been reported to indirectly harm local vegetation, hypothetically by putting a high pressure on plants due to a heavy aphid honeydew consumption. Indeed, recent studies in Spain have shown that due to their smaller size, L. neglectus workers collect less honeydew per ant that native L. grandis, but collect more honeydew per tree, because of their large number. Aphids excretion frequency has also been reported to be higher when in presence of L. neglectus than when in presence of L. grandis. However, a stronger negative impact on holm oak trees has not been confirmed, as acorn production, seedling emergency and quality did not differ between trees occupied by the invasive or by the native ant.
Finally, L. neglectus has been reported to be attracted by electrical equipment, and damaging it, by creating short circuits for example in alarms or swimming pool filters.
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