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Differential cannibalism and population dynamics in a host-parasitoid system
D J Reed1, M Begon1, D J Thompson1
1Population Biology Research Group, Department of Environmental and Evolutionary Biology, The University of Liverpool, Nicholson Building, PO Box 147, L69 3BX, Liverpool, UK.
Oecologia
|March 18, 2017
Summary
Host cannibalism impacts insect populations. Parasitized larvae are more frequently eaten, leading to stable coexistence or parasitoid extinction depending on initial conditions.
Area of Science:
- Ecology
- Population Dynamics
- Entomology
Background:
- Host-parasitoid interactions are crucial in ecological systems.
- Cannibalism can significantly influence population dynamics.
- Understanding these factors is vital for pest management.
Purpose of the Study:
- To investigate the role of host cannibalism in a host-parasitoid system.
- To model the population dynamics of Plodia interpunctella and its parasitoid.
- To explore how differential cannibalism affects system stability.
Main Methods:
- Experimental encounters between parasitized and unparasitized Plodia interpunctella larvae.
- Development and analysis of a Lotka-Volterra-type population dynamics model.
- Simulation of alternative stable states based on varying initial conditions.
Main Results:
- Parasitized Plodia interpunctella larvae were more susceptible to cannibalism.
- The model demonstrated that differential cannibalism can lead to alternative stable states.
- These states include stable coexistence of host and parasitoid, or parasitoid extinction.
Conclusions:
- Host cannibalism is a significant factor in host-parasitoid population dynamics.
- Differential cannibalism can create alternative stable states, impacting biological control.
- Further research into mechanisms and implications for pest control is warranted.
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