Influence of climate on malaria transmission depends on daily temperature variation

Krijn P. Paaijmans, Simon Blanford, Andrew S. Bell, Justine I. Blanford, Andrew F. Read, Matthew B. Thomas

Research output: Contribution to journalArticlepeer-review

282 Scopus citations

Abstract

Malaria transmission is strongly influenced by environmental temperature, but the biological drivers remain poorly quantified. Most studies analyzing malaria-temperature relations, including those investigating malaria risk and the possible impacts of climate change, are based solely on mean temperatures and extrapolate from functions determined under unrealistic laboratory conditions. Here, we present empirical evidence to show that, in addition to mean temperatures, daily fluctuations in temperature affect parasite infection, the rate of parasite development, and the essential elements of mosquito biology that combine to determine malaria transmission intensity. In general, we find that, compared with rates at equivalent constant mean temperatures, temperature fluctuation around low mean temperatures acts to speed up rate processes, whereas fluctuation around high mean temperatures acts to slow processes down. At the extremes (conditions representative of the fringes of malaria transmission, where range expansions or contractions will occur), fluctuation makes transmission possible at lower mean temperatures than currently predicted and can potentially block transmission at higher mean temperatures. If we are to optimize control efforts and develop appropriate adaptation or mitigation strategies for future climates, we need to incorporate into predictive models the effects of daily temperature variation and how that variation is altered by climate change.

Original languageEnglish (US)
Pages (from-to)15135-15139
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume107
Issue number34
DOIs
StatePublished - Aug 24 2010

Keywords

  • Anopheles mosquitoes
  • Climate change
  • Diurnal temperature variability
  • Ectotherms
  • Plasmodium malaria

ASJC Scopus subject areas

  • General

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