Statistical approach to the analysis of olive long-term pollen season trends in southern Spain

H García-Mozo; L Yaezel; J Oteros; C Galán

doi:10.1016/j.scitotenv.2013.11.142

Statistical approach to the analysis of olive long-term pollen season trends in southern Spain

Sci Total Environ. 2014 Mar 1:473-474:103-9. doi: 10.1016/j.scitotenv.2013.11.142. Epub 2013 Dec 20.

Authors

H García-Mozo¹, L Yaezel², J Oteros³, C Galán³

Affiliations

¹ Department of Botany, Ecology and Plant Physiology, Agrifood Campus of International Excellence (CeiA3), University of Córdoba, Córdoba, Spain. Electronic address: bv2gamoh@uco.es.
² Smith College University, Northampton, MA, USA.
³ Department of Botany, Ecology and Plant Physiology, Agrifood Campus of International Excellence (CeiA3), University of Córdoba, Córdoba, Spain.

PMID: 24361781
DOI: 10.1016/j.scitotenv.2013.11.142

Abstract

Analysis of long-term airborne pollen counts makes it possible not only to chart pollen-season trends but also to track changing patterns in flowering phenology. Changes in higher plant response over a long interval are considered among the most valuable bioindicators of climate change impact. Phenological-trend models can also provide information regarding crop production and pollen-allergen emission. The interest of this information makes essential the election of the statistical analysis for time series study. We analysed trends and variations in the olive flowering season over a 30-year period (1982-2011) in southern Europe (Córdoba, Spain), focussing on: annual Pollen Index (PI); Pollen Season Start (PSS), Peak Date (PD), Pollen Season End (PSE) and Pollen Season Duration (PSD). Apart from the traditional Linear Regression analysis, a Seasonal-Trend Decomposition procedure based on Loess (STL) and an ARIMA model were performed. Linear regression results indicated a trend toward delayed PSE and earlier PSS and PD, probably influenced by the rise in temperature. These changes are provoking longer flowering periods in the study area. The use of the STL technique provided a clearer picture of phenological behaviour. Data decomposition on pollination dynamics enabled the trend toward an alternate bearing cycle to be distinguished from the influence of other stochastic fluctuations. Results pointed to show a rising trend in pollen production. With a view toward forecasting future phenological trends, ARIMA models were constructed to predict PSD, PSS and PI until 2016. Projections displayed a better goodness of fit than those derived from linear regression. Findings suggest that olive reproductive cycle is changing considerably over the last 30years due to climate change. Further conclusions are that STL improves the effectiveness of traditional linear regression in trend analysis, and ARIMA models can provide reliable trend projections for future years taking into account the internal fluctuations in time series.

Keywords: Climate change; Growing season; Olea europaea; Olive pollen; Phenology; Trend.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Air Pollutants / analysis*
Air Pollution / statistics & numerical data*
Allergens / analysis*
Climate Change
Environmental Monitoring / methods*
Forecasting
Models, Theoretical
Olea*
Pollen*
Seasons
Spain

Substances

Air Pollutants
Allergens