Published on 4 June 2015

climate change and colonization: this very allergenic pollen could invade us!

Ragweed pollen is highly allergenic plant, of North American origin. Very invasive it exists today in Burgundy, Auvergne and Rhône-Alpes and continues to grow. Its pollen peak is August and September and people sensitive to pollen will be responsive over many months.

The ongoing climate change will promote the expansion of ragweed in North and East of Europe. The air concentrations of ragweed pollen of mugwort leaves, very allergenic, could have quadrupled in Europe by 2050. Climate change would be responsible for two thirds of this increase, the remaining third would be due on him to the colonization of the plant, favored by human activities.

These estimates, made by researchers (of  Laboratoire des sciences du climat et de l'environnement (CNRS/CEA/UVSQ), Laboratoire de météorologie dynamique (CNRS/Ecole Polytechnique/UPMC/ENS Paris),  of INERIS and RNSA) in collaboration with several European institutions, show that it is now necessary to establish coordinated management of this invasive plant in Europe followed by a long term pollen and mapping the presence of plants. These estimates are published in the journal Nature Climate Change May 25, 2015.

References :
Effects of climate change and seed dispersal on airborne ragweed pollen loads in Europe. Hamaoui-Laguel L., R. Vautard, L. Liu, F. Solmon, N. Viovy, D. Khvorosthyanov, F. Essl, I. Chuine, A. Colette, M. A. Semenov, A. Schaffhauser, J. Storkey, M.Thibaudon, M. Epstein, Nature Climate Change, 25 mai 2015. DOI : 10.1038/nclimate2652

Read the french press release : le communiqué de presse du CNRS