Odor alters color preference in a foraging jumping spider

Area of Science:

• Behavioral Ecology
• Evolutionary Biology
• Sensory Ecology

Background:

• Aposematic coloration in prey often involves multiple sensory signals.
• The evolution of multimodal warning displays is not fully understood.
• Synergistic interactions between signal components (e.g., odor and color) are hypothesized but understudied in invertebrates.

Purpose of the Study:

• To investigate if prey odor influences predator color aversion in jumping spiders.
• To test the hypothesis of synergistic interactions between warning signal modalities.
• To examine the role of novelty in odor-color interactions.

Main Methods:

• Jumping spiders (Habronattus trimaculatus) were presented with artificially colored prey (red or green vs. black).
• Prey was offered in the presence or absence of a novel odor from a chemically defended bug (Acanthocephala femorata).
• Spider prey choices were recorded to assess color aversion influenced by odor presence and novelty.

Main Results:

• Spiders showed increased aversion to red prey when a novel odor was present.
• This odor-color interaction effect was specific to red and did not occur with green prey.
• The effect was observed only with novel odors; repeated exposure diminished the aversion.
• Subsequent experiments confirmed the odor did not influence responses to green prey.

Conclusions:

• Prey odor can synergistically enhance predator aversion to specific warning colors, particularly red.
• The novelty of the odor is crucial for this synergistic effect.
• Findings support the role of predator psychology in the evolution of multimodal aposematism.