Colour preference and foraging constancy in the Asian giant honeybee Apis dorsata

Area of Science:

• Ecology
• Animal Behaviour
• Pollination Biology

Background:

• Tropical pollinators operate in dynamic environments, necessitating adaptable foraging strategies.
• Floral constancy, a temporary focus on one flower type, is crucial for foraging efficiency and plant-pollinator dynamics.
• The Asian giant honeybee (Apis dorsata) is a key tropical pollinator whose foraging behaviours are understudied.

Purpose of the Study:

• To investigate how reward concentration and learning influence colour preference and floral constancy in Apis dorsata.
• To determine if recent experience modifies established colour biases.
• To assess the correlation between the spectral composition of the local floral community and Apis dorsata's colour preferences.

Main Methods:

• Utilized blue-yellow dimorphic artificial flower arrays to test Apis dorsata.
• Manipulated reward concentration (low vs. high) to observe effects on spontaneous colour preference and constancy.
• Employed training and sequential colour exposure to assess the role of learning and recent experience.

Main Results:

• Apis dorsata exhibited a strong spontaneous preference and high constancy for blue (short-wavelength).
• This blue preference was most pronounced under low-reward conditions and diminished with higher reward concentrations.
• Learning and recent colour exposure demonstrated the flexibility of bee preferences, with experience overriding innate biases.

Conclusions:

• Apis dorsata's colour preferences are dynamic, significantly shaped by reward quality and recent foraging experiences.
• Reward concentration appears to modulate bee arousal, influencing reliance on innate biases versus exploratory behaviour.
• The findings have critical implications for understanding plant-pollinator interactions and potential pollinator-mediated selection in tropical ecosystems.