Limitations of learning in the proboscis reflex of the flower visiting syrphid fly Eristalis tenax.

ABSTRACT: Flower visiting Eristalis hoverflies feed on nectar and pollen and are known to rely on innate colour preferences. In addition to a preference for visiting yellow flowers, the flies possess an innate proboscis reflex elicited by chemical as well as yellow colour stimuli. In this study we show that the flies' proboscis reflex is only triggered by yellow colour stimuli and not altered by conditioning to other colours. Neither in absolute nor in differential conditioning experiments the flies learned to associate other colours than yellow with reward. Even flies that experienced only blue nutrients during the first four days after hatching could not be trained to extend the proboscis towards other colours than yellow. The natural targets of the visually elicited proboscis reflex are yellow po

SUBMITTER: Lunau K 

PROVIDER: S-EPMC5860702 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature