Spread of invasive ragweed: climate change, management and how to reduce allergy costs
Article first published online: 27 AUG 2013
© 2013 The Authors. Journal of Applied Ecology © 2013 British Ecological Society
Journal of Applied Ecology
Volume 50, Issue 6, pages 1422–1430, December 2013
How to Cite
Richter, R., Berger, U. E., Dullinger, S., Essl, F., Leitner, M., Smith, M., Vogl, G. (2013), Spread of invasive ragweed: climate change, management and how to reduce allergy costs. Journal of Applied Ecology, 50: 1422–1430. doi: 10.1111/1365-2664.12156
- Issue published online: 15 NOV 2013
- Article first published online: 27 AUG 2013
- Manuscript Accepted: 22 JUL 2013
- Manuscript Received: 25 APR 2013
- Austrian Academy of Sciences within the Global Change Programme
- European Science Commission. Grant Number: FP 6 project 036866: ECOCHANGE
- Ambrosia artemisiifolia ;
- cost efficiency;
- pollen dispersion
- Ragweed Ambrosia artemisiifolia L. is rapidly spreading in Europe. Its pollen is highly allergenic, with 4–5% of Europeans being sensitized. There is an urgent need to curtail the further spread to minimize allergy costs.
- We simulated the spread of ragweed in Austria and southern Germany (Bavaria) until 2050 with particular emphasis on expected climate change. Using different management scenarios and levels of management effort, we analysed the potential for reducing human allergy costs, that is, expenses caused by allergies from ragweed pollen, by curtailing the accelerating spread of ragweed. We accounted for three contrasting climate assumptions: no change in temperature and moderate (annual temperature increase of 0·025 °C) and more extreme (annual temperature increase of 0·04 °C) climate change.
- We found that a carefully designed management plan consisting of survey and eradication can drastically reduce the spread of ragweed. Without management, mean allergy costs for the management period (2011–2050) amount to about 290, 335 and 365 million € annually under the three climate change assumptions.
- Following an optimally allocated management strategy with an annual budget of 30 million € reduces mean allergy costs by 258, 295 and 325 million € per year. Thus, the management may yield substantial savings, in particular under more extreme warming, where total savings over 40 years amount to about 12 billion €.
- Synthesis and applications. Our study illustrates that management of invasive alien species has an economic benefit beside natural conservation. We provide guidance for the future management using the example of ragweed in Austria and Bavaria and show that although the species has expanded its range and abundance substantially in recent years, a well-designed and ambitious management programme still may yield substantial benefits. This is true for current climatic conditions as well as for future climate change scenarios, albeit management costs increase with a warming climate. However, possible gains are increasing in parallel. Given the scale of impacts on human health, and the substantial gains accrued from management, our results suggest that it is wise to halt further spread of ragweed.