Changement climatique - Recherche française (avec laboratoires CNRS) - 2010-2015


Mathematical modelling of the impact of climatic conditions in France on Rhipicephalus sanguineus tick activity and density since 1960

Publication Year


  • Beugnet, Frederic
  • Kolasinski, Michel
  • Michelangeli, Paul-Antoine
  • Vienne, Julien
  • Loukos, Harilaos
GEOSPATIAL HEALTH Volume: 5 Issue: 2 Pages: 255-263 Published: 2011

Rhipicephalus sanguineus, the brown dog tick, has a worldwide distribution in areas with a relatively warm climate, including mild winters. This tick plays an important role as vector for various animal and human pathogens, including bacteria and protozoa. Based on precise daily meteorological data from the past 40 years, combined with mathematical modelling designed to predict tick activity, two modelling approaches were developed. The first examined the evolution of the number of weeks with favourable biological conditions for ticks in four French cities located at various latitudes of the country: Nimes in the south, Paris in the north, Lyon in the east and Nantes in the west. The second analysed the extension of the geographical surface area in km(2) where the biological conditions favour tick activity for at least 12 weeks per year. Both analyses revealed clear evidence of increased temperatures coupled with an augmented tick activity index in three of the four cities. However, the change was not significant in Nimes, where the climate is Mediterranean and the tick is already endemic. For Paris, Lyon and Nantes, the activity index values have increased significantly, i.e. by 4.4%, 4.0% and 3.4%, respectively. The distribution of the activity index values is evolving strongly with significantly fewer values below 50% since the 1960s and a clear decrease of values between 20% and 50% during the latest decade. Between 1960 and 2000, the theoretical extension of the surface area where the climatic index is suitable for R. sanguineus has increased by 66%. Even though several other important factors, such as changes in biotopes or human activity, are not included in this study, the resulting patterns and trends are noticeable. Our models constitute the first demonstration of the impact of climate change on the activity and distribution of ticks and confirm the observed northward migration trend for this Mediterranean domestic tick.

Author Keyword(s)
  • Rhipicephalus sanguineus
  • mathematical modelling
  • climate change
  • epidemiology
  • France
KeyWord(s) Plus
ESI Discipline(s)
  • Clinical Medicine
  • Social Sciences
Web of Science Category(ies)
  • Health Care Sciences & Services
  • Public, Environmental & Occupational Health

[Beugnet, Frederic] Merial, F-69007 Lyon, France; [Kolasinski, Michel; Michelangeli, Paul-Antoine; Vienne, Julien; Loukos, Harilaos] CLIMPACT, F-75009 Paris, France

Reprint Adress

Beugnet, F (reprint author), Merial, 29 Av Tony Garnier, F-69007 Lyon, France.

  • France
Accession Number
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