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Predator-induced neophobia in juvenile cichlids
Denis Meuthen1, Sebastian A Baldauf2, Theo C M Bakker2
1Institute for Evolutionary Biology and Ecology, University of Bonn, An der Immenburg 1, 53121, Bonn, Germany. dmeuthen@evolution.uni-bonn.de.
Oecologia
|November 19, 2015
Summary
Predation risk increases neophobia, prompting fish to form tighter shoals when encountering novel threats. This cross-sensory adaptation enhances antipredator strategies in prey animals.
Area of Science:
- Ethology
- Behavioral Ecology
- Neuroethology
Background:
- Prey animals exhibit plastic antipredator strategies in response to fluctuating predation risk.
- Predation risk may induce neophobia, a response to novel cues, but sensory channel specificity remains unclear.
Purpose of the Study:
- To investigate if predator-induced neophobia is specific to the sensory channel of the predation cue.
- To test the hypothesis that predation risk enhances responses to novel cues from different sensory modalities.
Main Methods:
- Juvenile cichlids (Pelvicachromis taeniatus) were exposed to conspecific alarm cues (predation risk) or controls from hatching.
- Shoaling behavior was assessed in response to a novel disturbance cue from a different sensory channel at 2 months of age.
Main Results:
- Fish exposed to predation risk formed more compact shoals when presented with a novel disturbance cue compared to controls.
- Experienced predation risk altered the relationship between shoal density and shoal homogeneity.
Conclusions:
- Predation risk enhances cross-sensory sensitivity to novel cues, demonstrating an effective antipredator mechanism.
- Neophobia can be modulated by prior experience with predation risk, extending beyond the initial sensory channel.
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