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Experiments with fire ants suggest that queen pheromones act quantitatively in the regulation of queen number in colonies of social insects. Specific mechanisms probably include recognition by workers of unique quantitative blends of pheromones produced by queens, and quantitative effects of pheromones acting at the level of the colony on workers and at the(More)
In the fire ant Solenopsis invicta, sexually mature virgin females are prevented from shedding their wings and becoming functional egg layers by the presence of the mated queen. Experimental data suggest that this inhibitory effect results from the action of a relatively nonvolatile primer pheromone (or pheromones) produced by the mated queen and(More)
In common with many arthropods, the true bug, Leptoglossus phyllopus, when disturbed, emits a two-phase secretion that consists of an organic phase and an aqueous phase. The organic phase is a mixture of highly reactive low-molecular-weight compounds, analogous to those produced by other arthropods, and is deterrent to many kinds of predators. The aqueous(More)
SUMMARY Interspecific trail following activity of poison sac contents from four species c leaf-cutting ants was investigated. With only one exception, all the species teste followed trails made from each others poison sac contents. However when the an1 were given a choice of following one of two separate trails, clear differences were show in the poison sac(More)
In laboratory and field bioassays, the response ofDendroctonus frontalis was significantly greater to the mixture of (1S, 5R)-(-)-frontalin andalpha-pinene than to (1R,5S)-(+)-frontalin andalpfa-pinene. Electro-physiological studies revealed that antennal olfactory receptor cells were significantly more responsive to (1S, 5R)-(-)-frontalin than to (1R,(More)
Formic acid synthesis in the poison gland of Camponotus pennsylvanicus is closely related to the C-1 metabolism of the glandular cells. Serine, glycine, and histidine are potential C-l donors to formic acid by several tetrahydrofolate intermediates. Formic acid is accumulated by its transfer to an insulated reservoir, so that the ant avoids the acid's(More)
The anal gland secretions of dolichoderine ants in the genus Azteca are fortified with cyclopentyl ketones. Since these compounds, 2-methylcyclopentanone, cis-1-acetyl-2-methylcyclopentane, and 2-acetyl-3-methylcyclopentene, release sustained alarm behavior in ant workers, they constitute a new chemical class of insect pheromones. The ketones probably also(More)
Predatory behavior toward an unpalatable sympatric prey was examined in the southern grasshopper mouse, Onychomy torridus (Coues). Mice preferred the palatable grasshopper Brachystola magna over the unpalatable secretion-producing grasshopper Taeniopoda eques. Consumption of T. eques decreased 35% while consumption of B. magna remained stable during three(More)