The cost of being an omnivore: mandible wear from plant feeding in a true bug |
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| Authors: | Bernard D Roitberg David R Gillespie Donald M J Quiring Colleen R Alma Wade H Jenner Jennifer Perry Jason H Peterson Maxence Salomon Sherah VanLaerhoven |
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| Institution: | (1) Department of Biology, Simon Fraser University, Burnaby, BC, Canada, V5A 1S6;(2) Pacific Agri-Food Research Centre, Agriculture and Agri-Food Canada, P.O. Box 1000, Agassiz, BC, Canada, V0M 1A0;(3) Department of Biology, Carleton University, Ottawa, ON, Canada, K1S 5B6;(4) Department of Zoology, University of Toronto, Toronto, ON, Canada, M5S 3G5;(5) Department of Biology, The King's University College, Edmonton, AB, Canada, T6B 2H3;(6) Department of Biology, University of Windsor, Windsor, ON, Canada, N9B 3P4 |
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| Abstract: | Evolutionary and ecological transitions from carnivorous to omnivorous feeding may be constrained by the ability of the animal
to cope with disparate types of foods, even if preadaptations for such behaviour exist. The omnivorous true bug, Dicyphus hesperus (Hemiptera: Miridae) requires both animals (small, soft-bodied insects) and plants in its diet and obtains the majority of
its dietary and metabolic water from plant feeding. Serrations on the lateral margins of the mandibular stylets wear with
age, and this wear is exacerbated when the insects feed on plants compared to those provided free water and no plants. D. hesperus that feed on plants attack fewer prey but consumed similar amounts of prey tissue compared to individuals that were provided
free water. Although others have shown mandible wear for plant-chewing animals we show for the first time that plant feeding
can impose similar wear on plant-piercing animals as well. |
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