AbstractSome insect herbivores can regulate their
nourishment intake by different feeding behaviour.
This mechanism allows them to persist with utilising
different food resources according to the composition of
the vegetation within their habitats. Using a two-choice
experiment, we analysed foraging behaviour in females
of the tree-dwelling bush-cricket Barbitistes constrictus
(Orthoptera), which originated from two different
forest habitats, spruce and beech forest. We found that
individuals from the spruce forest mainly foraged on
needle tips, and thus they nibbled more needles per day
than individuals from the beech forest (medians 106.0 vs.
42.5; p < 0.0001). However, when the contents of droppings
were dissected, the volume of consumed spruce was
similar in both groups of bush-crickets (median > 90%),
which is explained by the different feeding techniques of
bush-crickets from different habitats. We propose possible
scenarios for bush-cricket feeding adaptations to the
deleterious effects of the host plant chemical compounds
serving as a plant defence against herbivores.