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

Table 2

Relative frequency (absolute frequency/number of observations) of tree visitation by each ant species at invaded (I) or control (C) forest during the activity period (7 months; in 2006). In brackets are shown absolute frequency that is the number of times each ant species was found along the seven censuses (number of observations: 840 at invaded fragments, 546 at control fragments). Ants were discriminated according to their nesting site: soil (S), arboricolous (A), or arboricolous-under bark (U).

Ant specie	I	C	Nesting site
Lasius neglectus	0.173 (145)		S
Lasius grandis	0.021 (18)	0.176 (96)	S
Lasius emarginatus	0.001 (1)	0.101 (55)	S
Crematogaster scutellaris	0.095 (84)	0.148 (80)	A
Camponotus aethiops		0.064 (35)	S
Camponotus cruentatus	0.008 (7)	0.035 (19)	S
Camponotus piceus		0.002 (1)	S
Camponotus truncatus	0.005 (4)	0.060 (33)	A
Formica rufibarbis		0.002 (1)	S
Myrmica spinosior		0.015 (8)	S
Pheidole pallidula	0.001 (1)	0.002 (1)	S
Plagiolepis pygmaea	0.004 (3)	0.031 (17)	S
Temnothorax lichtensteini	0.026 (22)	0.038 (21)	U
Native ant species richness	8	12