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A Real-Time Interactive System for Studying Confrontational Pursuit Behavior in Rodents

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Variable prey development time suppresses predator-prey cycles and enhances stability.

James T Cronin¹, John D Reeve², Dashun Xu³

¹Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, 70803, USA.

Ecology Letters

|January 19, 2016

Summary

Developmental variability in host populations enhances predator-prey interaction stability. Increased variation in host development times reduced population fluctuations and prevented extinctions in experimental ecosystems.

Keywords:

Age-structured populations developmental variability host-parasitoid microcosms intraspecific trait variability population cycles predator-prey stability

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Area of Science:

Ecology
Population Dynamics
Theoretical Ecology

Background:

Theoretical models suggest age structure and developmental time variability influence predator-prey dynamics.
Experimental evidence for these theoretical predictions remains scarce.

Purpose of the Study:

To experimentally test if increased variability in host development time promotes host-parasitoid interaction stability.
To investigate the impact of developmental variability on population cycles and extinction risk.

Main Methods:

A host-parasitoid microcosm experiment was established.
Two treatments were applied: Normal variance and High variance in host development time.
Population dynamics and insect abundances were monitored and compared.

Main Results:

High variance in host development significantly reduced variability in insect abundances (18-24%).
Periodicity in host-parasitoid population dynamics was eliminated under high variance conditions.
Simulation models confirmed that high developmental variability conferred stability and prevented host extinction.

Conclusions:

Developmental variability is a critical factor in predator-prey population dynamics.
Increased developmental variability can stabilize host-parasitoid interactions.
This finding has potential applications in biological pest management programs.