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Journal Article
Research Support, Non-U.S. Gov't
The insect ovipositor as a volatile sensor within a closed microcosm.
Journal of Experimental Biology 2017 May 2
We show that the insect ovipositor is an olfactory organ that responds to volatiles and CO2 in gaseous form. We demonstrate this phenomenon in parasitic wasps associated with Ficus racemosa where ovipositors, as slender as a human hair, drill through the syconium (enclosed inflorescences) and act as a guiding probe to locate highly specific egg-laying sites hidden inside. We hypothesize that olfaction will occur in the ovipositors of insects such as parasitic fig wasps where the hosts are concealed and volatile concentrations can build up locally. Relevant stimuli such as herbivore-induced fig volatiles and CO2 elicited electrophysiological responses from the ovipositors. Silver nitrate staining also revealed pores in ovipositor sensilla, indicating their olfactory nature. Insects could use volatile sensors on their ovipositors to evaluate ecologically relevant stimuli for oviposition. Further investigations on the sensory nature of ovipositors can provide designs for development of ovipositor-inspired micro-chemosensors.
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