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Variability in the behavioural responses of three generalist herbivores to the most abundant coumarin in Daphne laureola leaves

AuthorsAlonso, Conchita ; García, Isabel M.; Zapata, Nelson; Pérez, Ricardo
KeywordsChemical defences
Diffuse coevolution
Feeding behaviour
Generalist host-range
Plant-herbivore interactions
Pseudenargia ulicis
Noctua janthe
Spodoptera littoralis
Issue Date4-Jun-2009
PublisherNetherlands Entomological Society
CitationEntomologia Experimentalis et Applicata 132(1): 76-83 (2009)
AbstractWe evaluated the responses of three generalist herbivores (Lepidoptera: Noctuidae) to the most abundant coumarin in young leaves of spurge-laurel, Daphne laureola L. (Thymelaeaceae), a perennial shrub consistently fed upon by several noctuid species. Pseudenargia ulicis Staud and Noctua janthe Borkhausen are natural herbivores of the species in southeastern Spain, whereas Spodoptera littoralis Boisduval is a model species frequently used to address the antifeedant role of secondary compounds. Discrimination between control and coumarin-coated D. laureola leaves was investigated by short-term choice experiments. We found species-specific behavioural responses to the treatment: P. ulicis preferred the control leaves, whereas S. littoralis did not discriminate between leaf treatments, although it clearly avoided coumarin when incorporated into an artificial diet, and N. janthe preferred the coumarin-coated leaves. Furthermore, N. janthe larvae reduced consumption when the proportion of treated leaves ingested increased and consumption of S. littoralis larvae was also reduced in coumarin-containing diet under no-choice conditions. Our results highlight that different herbivore species feeding simultaneously on the same host plant respond differently to a single chemical defence compound, likely constraining a directional response of the plant to selection.
Description8 páginas, 3 figuras, 1 tabla.
Publisher version (URL)http://dx.doi.org/10.1111/j.1570-7458.2009.00869.x
Appears in Collections:(IIQ) Artículos
(EBD) Artículos
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