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Author Spotlight: Real-Time Monitoring of Parasite Burden and Host Response

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Published on: May 31, 2024

Seasonal forcing in a host-macroparasite system.

Rachel A Taylor¹, Andrew White¹, Jonathan A Sherratt¹

¹Department of Mathematics, Heriot-Watt University, Edinburgh, UK.

Journal of Theoretical Biology

|December 3, 2014

Summary

Seasonal forcing significantly impacts host-macroparasite dynamics, leading to complex population cycles and varied behaviors like chaos. This research highlights seasonality

Keywords:

Bifurcation Nematode parasite Population cycles Red grouse Seasonality

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Area of Science:

Ecology
Mathematical Biology
Parasitology

Background:

Seasonal environmental variability is a key driver in ecological systems.
While understood in host-microparasite systems, its role in host-macroparasite interactions remains less explored.
Macroparasitic infections, involving larger parasites, present unique ecological dynamics.

Purpose of the Study:

To analyze the impact of seasonal forcing on a general host-macroparasite system.
To investigate the influence of the parasite's larval stage and host birth rate seasonality.
To understand the complex dynamics arising from seasonal environmental changes in host-parasite relationships.

Main Methods:

Developed a general host-macroparasite model incorporating seasonal forcing.
Applied seasonal forcing to the host's birth rate.
Analyzed the system's dynamics, focusing on the period of limit cycles in the unforced system.

Main Results:

Seasonal forcing can induce multi-year cycles, multiple solutions, quasi-periodicity, and chaos in host-macroparasite systems.
These systems exhibit greater potential for multiple solutions and a wider range of periodic behaviors than microparasite systems.
Model parameters for red grouse and Trichostrongylus tenuis demonstrate seasonality's role in explaining observed abundance cycle variations.

Conclusions:

Seasonal forcing is a critical factor in host-macroparasite population dynamics.
The study provides a framework for understanding complex ecological patterns driven by seasonality.
Findings suggest seasonality could explain variations in red grouse population cycles.