Macroclimate Determines the Global Range Limit of Aedes aegypti

Abstract

Aedes aegypti is the main vector of dengue and a number of other diseases worldwide. Because of the domestic nature of this mosquito, the relative importance of macroclimate in shaping its distribution has been a controversial issue. We have captured here the worldwide macroclimatic conditions occupied by Aaegypti in the last century. We assessed the ability of this information to predict the species’ observed distribution using supra-continental spatially-uncorrelated data. We further projected the distribution of the colonized climates in the near future (2010–2039) under two climate-change scenarios. Our results indicate that the macroclimate is largely responsible for setting the maximum range limit of Aaegypti worldwide and that in the near future, relatively wide areas beyond this limit will receive macroclimates previously occupied by the species. By comparing our projections, with those from a previous model based strictly on species-climate relationships (i.e., excluding human influence), we also found support for the hypothesis that much of the species’ range in temperate and subtropical regions is being sustained by artificial environments. Altogether, these findings suggest that, if the domestic environments commonly exploited by this species are available in the newly suitable areas, its distribution may expand considerably in the near future.

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Acknowledgments

This work was supported by a grant from Fundação para a Ciência e a Tecnologia (FCT) (PTDC/SAU-EPI/115853/2009). C.C. was supported by a FCT individual grant (SFRH/BPD/84422/2012).

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Correspondence to César Capinha.

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Capinha, C., Rocha, J. & Sousa, C.A. Macroclimate Determines the Global Range Limit of Aedes aegypti . EcoHealth 11, 420–428 (2014). https://doi.org/10.1007/s10393-014-0918-y

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Keywords

  • Aedes aegypti
  • Climate change
  • Dengue
  • Global distribution
  • Urban disease-vectors