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Aerobiologia

, Volume 35, Issue 1, pp 153–163 | Cite as

Decrease or increase? Temporal changes in pollen concentrations assessed by Bayesian statistics

  • Susanne Jochner-OetteEmail author
  • Annette Menzel
  • Regula Gehrig
  • Bernard Clot
Original Paper
  • 113 Downloads

Abstract

Aerobiological studies mostly apply linear models when analysing long-term changes in pollen concentrations. There is some evidence that linear models are not fully suitable for describing these changes in recent decades since pollen concentrations of some species have increased until 1990 and decreased subsequently. In order to describe the behaviour of annual pollen concentrations (a factor contributing to the incidence of allergies) in a more flexible way, we made use of Bayesian statistics that describe discontinuities (i.e. change points) and quantify the direction and speed of changes. We examined long-term aerobiological pollen data of Betula spp. (birch), Corylus spp. (hazel) and Poaceae (grasses) from six stations in Switzerland (Basel, Buchs, Davos, Münsterlingen, Neuchâtel and Zurich) for the period 1985–2014. For most of the analysed stations and species, the one change point model was considered as the best model. The only exceptions were Corylus pollen time series recorded at Neuchâtel and Zurich that could be better described with the linear model. The results indicated that all pollen records of Corylus were characterized by increased pollen concentrations in recent years. For Betula pollen concentrations, four sites were associated with recent decreases; increases were only found for Buchs and Münsterlingen. Regarding Poaceae pollen, half of the stations (N = 3) were linked to decreases. Trends of linear regressions differed considerably in magnitude or even differed in sign compared to the Bayesian results. Our results indicate that the choice of the statistical method is of major importance when interpreting aerobiological data. Further studies should focus on the reasons (climate, land use changes, etc.) responsible for changes in atmospheric pollen loads in detail.

Keywords

Bayesian statistics Betula Change point Corylus Poaceae Pollen concentrations Switzerland 

Notes

Acknowledgements

We thank the Working group of Aerobiology, R.M. Leuschner and A.G. Peeters, for providing the pollen data of Switzerland before 1993. We also acknowledge Johanna Jetschni’s GIS support.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • Susanne Jochner-Oette
    • 1
    Email author
  • Annette Menzel
    • 2
    • 3
  • Regula Gehrig
    • 4
  • Bernard Clot
    • 4
  1. 1.Physical Geography/Landscape Ecology and Sustainable Ecosystem DevelopmentCatholic University Eichstätt-IngolstadtEichstättGermany
  2. 2.Department of Ecology and Ecosystem Management, EcoclimatologyTechnische Universität MünchenFreisingGermany
  3. 3.Institute for Advanced StudyTechnische Universität MünchenGarchingGermany
  4. 4.Federal Office of Meteorology and Climatology MeteoSwissZurich-AirportSwitzerland

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