Metabolic approaches to understanding climate change impacts on seasonal host-macroparasite dynamics

Péter K. Molnár, Susan J. Kutz, Bryanne M. Hoar, Andrew P. Dobson

Research output: Contribution to journalArticlepeer-review

104 Scopus citations


Climate change is expected to alter the dynamics of infectious diseases around the globe. Predictive models remain elusive due to the complexity of host-parasite systems and insufficient data describing how environmental conditions affect various system components. Here, we link host-macroparasite models with the Metabolic Theory of Ecology, providing a mechanistic framework that allows integrating multiple nonlinear environmental effects to estimate parasite fitness under novel conditions. The models allow determining the fundamental thermal niche of a parasite, and thus, whether climate change leads to range contraction or may permit a range expansion. Applying the models to seasonal environments, and using an arctic nematode with an endotherm host for illustration, we show that climate warming can split a continuous spring-to-fall transmission season into two separate transmission seasons with altered timings. Although the models are strategic and most suitable to evaluate broad-scale patterns of climate change impacts, close correspondence between model predictions and empirical data indicates model applicability also at the species level. As the application of Metabolic Theory considerably aids the a priori estimation of model parameters, even in data-sparse systems, we suggest that the presented approach could provide a framework for understanding and predicting climatic impacts for many host-parasite systems worldwide.

Original languageEnglish (US)
Pages (from-to)9-21
Number of pages13
JournalEcology letters
Issue number1
StatePublished - Jan 2013

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics


  • Climate change
  • Expected lifetime reproductive output
  • Fitness
  • Host-parasite systems
  • Metabolic theory of ecology
  • Ostertagia gruehneri
  • R
  • Seasonality
  • Sharpe-Schoolfield model
  • Van't Hoff-Arrhenius relation


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