|Reference : Does Tribolium brevicornis cuticular chemistry deter cannibalism and predation of pupae?|
|Scientific journals : Article|
|Life sciences : Entomology & pest control|
|Does Tribolium brevicornis cuticular chemistry deter cannibalism and predation of pupae?|
|Alabi, Taoffic [> >]|
|Dean, Jennifer [> >]|
|Michaud, Jean-Pierre [> >]|
|Verheggen, François [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]|
|Lognay, Georges [Université de Liège - ULg > Chimie et bio-industries > Chimie analytique >]|
|Haubruge, Eric [Université de Liège - ULg > Services administratifs généraux > Vice-Recteur de Gembloux Agro Bio Tech >]|
|Journal of Insect Science [=JIS]|
|[en] cuticular hydrocarbons ; feeding deterrence ; flour disks ; pupal defense|
|[en] The cuticular hydrocarbons of insects are species-specific and often function as semiochemicals.
The activity of Tribolium brevicornis cuticular hydrocarbons as feeding deterrents that ostensibly
function to prevent pupal cannibalism and predation was evaluated. The cuticular hydrocarbons
of T. brevicornis pupae were characterized and flour disk bioassays conducted with individual
and combined extract components incorporated into artificial diets on which Tribolium adults fed
for six days. Feeding by T. brevicornis and T. castaneum on flour disks containing cuticular
extracts of T. brevicornis pupae resulted in reduced consumption and weight loss relative to
feeding on control flour disks. In both cases, feeding deterrence indices exceeded 80% suggesting
that T. brevicornis cuticular hydrocarbons could function to deter cannibalism and predation of
pupae by larvae and adult beetles. Sixteen different cuticular hydrocarbons were identified in T.
brevicornis pupal extracts. Eight of the commercially available linear alkanes were tested
individually in feeding trials with eight Tribolium species. One compound (C28) significantly
reduced the amount of food consumed by three species compared to control disks, whereas the
compounds C25, C26, and C27elicited increased feeding in some species. Four other compounds
had no effect on consumption for any species. When four hydrocarbon mixtures were tested for
synergistic deterrence on T. brevicornis and T. castaneum, none significantly influenced
consumption. Our results indicate that the cuticular chemistry of T. brevicornis pupae could serve
to deter predation by conspecific and congeneric beetles.
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