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Updated: Dec 19, 2025
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Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila
Published on: October 1, 2011
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Optimal reproductive phenology under size-dependent cannibalism.
Nao Takashina1,2, Øyvind Fiksen2
1Biodiversity and Biocomplexity Unit Okinawa Institute of Science and Technology Graduate University Okinawa Japan.
Ecology and Evolution
|June 4, 2020
Summary
Cannibalism among early life stages drives earlier breeding, creating a trade-off for parents. This size-mediated priority effect influences reproductive phenology across species.
Area of Science:
- Ecology
- Evolutionary Biology
- Behavioral Ecology
Background:
- Intra-cohort cannibalism exemplifies size-mediated priority effects in early life stages.
- Parental breeding timing involves a trade-off between optimal larval conditions and offspring predation risk.
Purpose of the Study:
- To develop a game-theoretic model to determine evolutionary stable breeding phenologies.
- To quantify the impact of cannibalism on seasonal egg fitness and emergent breeding phenology.
Main Methods:
- Devised an age-structured game-theoretic mathematical model.
- Analyzed size-dependent cannibalism effects on eggs, larvae, or both life stages.
Main Results:
- Inter-cohort cannibalism leads to earlier breeding than optimal environmental matching.
- Emergent breeding phenology is sensitive to the ontogeny of cannibalism (which life stage is affected).
Conclusions:
- Cannibalism's ontogeny is a potential driver of diverse reproductive phenologies across taxa.
- Cannibalism can explain breeding occurring earlier than predicted by environmental conditions alone.
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