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Effects of plant identity and diversity on the dietary choice of a soil‐living insect herbivore
Author(s) -
Schallhart Nikolaus,
Tusch Manuel Josef,
Wallinger Corinna,
Staudacher Karin,
Traugott Michael
Publication year - 2012
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.1890/11-2067.1
Subject(s) - herbivore , generalist and specialist species , forb , biology , trophic level , ecology , abundance (ecology) , plant community , habitat , grassland , species richness
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.