Multimodal floral signals and moth foraging decisions

Area of Science:

• Ecology
• Animal Behavior
• Sensory Ecology

Background:

• Floral traits signal pollinators through multiple senses.
• Hawkmoth (Manduca sexta) learning and sensory contributions to foraging are understudied.

Purpose of the Study:

• Investigate the relative importance of olfactory and visual floral cues for hawkmoth foraging.
• Determine how hawkmoths learn and integrate floral signals.

Main Methods:

• Used natural floral cues from Datura wrightii and Agave palmeri.
• Conducted two-choice assays manipulating olfactory and visual displays.
• Performed learning experiments with experienced and naive hawkmoths.

Main Results:

• Naive hawkmoths preferred flowers with both olfactory and visual cues.
• Learned hawkmoths prioritized olfactory cues when signals were decoupled.
• Combined cues of Datura wrightii influenced feeding time; no synergy for Agave palmeri.

Conclusions:

• Floral traits are learned as combinatorial signals by hawkmoths.
• Integrated floral traits from memory guide future foraging decisions.
• Sensory modality importance varies based on learning and floral attractiveness.