title: Effects of plant identity and diversity on the dietary choice of a soil-living insect herbivore.
abstract: Plant identity and diversity influence herbivore communities in many different ways. While it is well known how they affect the feeding preferences of aboveground herbivores, this information is lacking for soil ecosystems, where examining plant-herbivore trophic interactions is difficult. We performed a mesocosm experiment assessing how plant identity and diversity affect the food choice of Agriotes larvae, which are soil-living generalist herbivores. We offered four plant species, (maize, a grass, a legume, and a forb) at varying combinations and diversity levels to these larvae, and analyzed their feeding behavior using stable isotopes. We hypothesized that (1) their food choice is driven by preference for certain plant species rather than by root abundance and that (2) the preference for specific plants changes with increasing plant diversity. We found that larvae preferred the grass and legume but avoided maize and the forb. Whether a plant was preferred or avoided was independent of diversity, but the extent of avoidance or preference changed with increasing plant diversity. Our findings reveal that the dietary choice of soil-living generalist herbivores is determined by plant-specific traits rather than root abundance. Our data also suggest that soil herbivore feeding preferences are modulated by plant diversity.
authors: Mountain Agriculture Research Unit, Institute of Ecology, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria. klaus.schallhart@uibk.ac.at
authors: Nikolaus
authors: N
authors: Schallhart
authors: Manuel Josef
authors: MJ
authors: Tusch
authors: Corinna
authors: C
authors: Wallinger
authors: Karin
authors: K
authors: Staudacher
authors: Michael
authors: M
authors: Traugott
mesh_terms: D000818:Animals; D044822:Biodiversity; D001517:Coleoptera / Q000502:physiology*; D004032:Diet; D017753:Ecosystem; D060434:Herbivory / Q000502:physiology*; D018517:Plant Roots; D010944:Plants / Q000145:classification*; D012987:Soil
chemical_list: D012987:Soil