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Les ouvrières de la fourmiFormica lemani Bondroit, confinées dans du sable placé aussi bien au-dessus qu'au-dessous, creusent toujours dans un sens ascensionnel. Cette orientation persiste en pleine obscurité, mais disparaît lorsqu'on fait tourner les boîtes de sable autour de leur axe horizontal. Des ouvrières deF. lemani et deMyrmica ruginodis Nylander,(More)
The tunnels dug by isolated worker ants [Myrmica ruginodis Nylander,M. scabrinodis Nylander,Formica lemani Bondroit,F. fusca L. andLasius niger (L.)] have been studied photographically. Although there was much variation within species, certain interspecific differences in tunnel shape appeared. The tunnels ofL. niger are more spreading, longer and more(More)
The aphidsCinara pini andC. pinea are tended byFormica lugubris on young trees ofPinus sylvestris. Ants begin to forage on the trees in April before aphid colonies have developed. Trees within 5 m of the plot edge carry 2–3 times the number of ants as trees 5, 6 and 12 m from the edge. Neither species of aphid thrives on the introducedPinus contorta in(More)
1. In laboratory experimentsF. lemani andL. niger preferred to begin tunnels where moist sand met a solid surface. 2. Both species were, however, attracted to dig in artificial tunnels (made by pushing a wire into the sand). The effect of these was greater onF. lemani than onL. niger. 3. The tunnels whichL. niger dug, starting from an artificial tunnel,(More)
1. A computer model of the excavation behaviour of the antFormica lemani has simulated the rate of excavation and some features of the form of its tunnels. 2. The same model applied to another antLasius niger simulated the form of tunnels correctly but underestimated the depth of its tunnels. 3. In both species the individual variation predicted between(More)
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