Prey detection without successful capture affects spider's orb-web building behaviour
1Tokyo Keizai University, Kokubunji, Tokyo 185-8502, Japan. ken@tku.ac.jp
Die Naturwissenschaften
|May 31, 2007
Summary
Spiders adjust web-building investments based on prey encounters. Even unsuccessful predation attempts inform orb-web spiders (Cyclosa octotuberculata) to modify web structure and size.
Area of Science:
- Behavioral Ecology
- Animal Behavior
- Arachnology
Background:
- Animals utilize past foraging experiences to adapt their behavior to environmental conditions.
- Understanding how spiders learn from unsuccessful predation is crucial for comprehending foraging investment strategies.
Purpose of the Study:
- To investigate the impact of prey detection without capture on web construction in the orb-web spider Cyclosa octotuberculata.
- To determine if spiders adjust foraging investments based on information gained from unsuccessful predation experiences.
Main Methods:
- Four experimental treatments were applied to Cyclosa octotuberculata: successful feeding, single prey detection, multiple prey detection (five times), and a control.
- Web morphology, including total thread length and capture area, was measured and compared across treatments.
- The effect of prey detection with and without consumption was analyzed.
Main Results:
- Spiders in prey-detection treatments increased web thread length and capture area compared to controls, indicating learning from unsuccessful encounters.
- Spiders that fed on prey showed a greater increase in web investment than those with only prey detection.
- Web morphology adjustments varied with the number of prey detections, suggesting spiders alter web structure based on encounter frequency.
Conclusions:
- Orb-web spiders use information from unsuccessful predation to modify their foraging investments, specifically web construction.
- Both prey detection alone and prey detection with consumption provide distinct informational cues that influence web morphology.
- The number of unsuccessful prey encounters influences the degree of change in web morphology, indicating adaptive plasticity in spiders.
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