How does an invasive social wasp deal with changing contextual cues while foraging?

Area of Science:

• Behavioral Ecology
• Animal Cognition
• Insect Behavior

Background:

• Invasive species pose significant ecological challenges.
• Understanding behavioral plasticity is crucial for managing invasive populations.
• Foraging behavior in insects is often influenced by learned environmental cues.

Purpose of the Study:

• To investigate how the invasive wasp, Vespula germanica, adapts its foraging behavior to changes in learned environmental contexts.
• To determine the influence of recency and experience on cue-based foraging decisions in Vespula germanica.
• To assess the behavioral plasticity of Vespula germanica in response to unpredictable changes in food source availability and associated landmarks.

Main Methods:

• Four experiments were designed to test Vespula germanica's response to modified landmark arrays.
• Wasps were trained to associate a food source with a specific colored landmark array.
• Contextual changes involved altering the color and/or location of the landmark array after the food source was removed.

Main Results:

• Vespula germanica demonstrated a strong preference for the most recently learned color associated with a food source.
• This recency effect persisted even when the alternative color had been learned over a greater number of feeding trials.
• The results indicate a high degree of behavioral plasticity in response to changing foraging conditions.

Conclusions:

• Vespula germanica exhibits remarkable adaptability in foraging behavior when faced with unpredictable environmental changes.
• The wasp's decision-making prioritizes the most current learned associations, facilitating efficient exploitation of ephemeral resources.
• This plasticity is a key factor contributing to the ecological success and invasive potential of Vespula germanica.