The impact of landscape complexity and composition on honey bee visual learning

Area of Science:

• Ecology
• Animal Behavior
• Neuroscience

Background:

• Pollinator populations, including wild bees and managed honey bees, are declining due to factors like habitat loss, food scarcity, and pesticide exposure.
• Land-use change, converting natural habitats to agricultural or urban areas, is a significant stressor for bee populations.

Purpose of the Study:

• To investigate the direct relationship between landscape diversity, edge density, and honey bee (Apis mellifera) visual learning abilities.
• To determine if bees from diverse landscapes exhibit enhanced cognitive plasticity and learning performance.

Main Methods:

• Utilized a field-adapted proboscis extension response (PER) assay to measure honey bee learning.
• Assessed honey bee visual learning by associating colored paper strips (yellow with sugar reward, blue with salt aversion) with different landscapes characterized by varying edge density and diversity.

Main Results:

• A negative correlation was observed between increased landscape edge density and honey bee visual learning ability.
• Conversely, higher landscape diversity was directly associated with improved honey bee visual learning performance.

Conclusions:

• Landscape structure significantly influences honey bee cognitive functions, including learning.
• Reduced learning capacity in bees from simplified or high-edge-density landscapes may impair essential colony tasks such as foraging, navigation, and defense, potentially threatening colony viability.