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Aggression Is Induced by Resource Limitation in the Monarch Caterpillar
Joseph Collie1, Odelvys Granela1, Elizabeth B Brown1
1Department of Biological Sciences, and the Program in Neurogenetics, Florida Atlantic University, 5353 Parkside Drive, Jupiter, FL 33458, USA.
Iscience
|December 30, 2020
Summary
Monarch caterpillars (Danaus plexippus) exhibit aggressive lunges, especially when food is scarce. This suggests resource defense behavior in developing insects, offering a new model for aggression studies.
Area of Science:
- Ecology
- Animal Behavior
- Entomology
Background:
- Food availability is a critical factor influencing animal growth and behavior.
- Competition for resources can lead to territoriality and aggression in many species.
- Monarch butterfly caterpillars (Danaus plexippus) primarily consume milkweed, making food access vital.
Purpose of the Study:
- To investigate the impact of food availability on aggression in monarch caterpillars.
- To characterize the developmental trajectory of aggressive behaviors in Danaus plexippus.
- To determine if resource limitation triggers aggressive displays in this species.
Main Methods:
- Observation and quantification of aggressive lunges in monarch caterpillars across developmental stages.
- Experimental manipulation of food availability to assess its effect on aggression.
- Comparison of aggressive behavior under varying resource conditions.
Main Results:
- Monarch caterpillars exhibit stereotyped aggressive lunges that intensify with development, peaking in the 4th and 5th instars.
- Low food availability significantly increases the frequency of aggressive lunges toward conspecifics.
- Findings suggest that resource defense is a potential driver of aggression in monarch caterpillars.
Conclusions:
- Monarch caterpillars display aggression linked to food availability, indicating resource defense behavior.
- This species serves as a valuable model for studying the interplay between resource limitation and aggression.
- Further research can explore the neuroethology underlying aggression in this insect model.
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