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Flowering Phenology and Characteristics of Pollen Aeroparticles of Quercus Species in Korea
Open AccessArticle

Pollen Production of Quercus in the North-Western Iberian Peninsula and Airborne Pollen Concentration Trends during the Last 27 Years

1
Earth Sciences Institute (ICT), Pole of the Faculty of Sciences University of Porto, 4169-007 Porto, Portugal
2
CITACA. Department of Plant Biology and Soil Sciences University of Vigo, 32002 Ourense, Spain
3
Department of Geosciences, Environment and Spatial Plannings of the Faculty of Sciences University of Porto, 4169-007 Porto, Portugal
4
Department of Biology of the Faculty of Sciences University of Porto, 4169-007 Porto, Portugal
*
Author to whom correspondence should be addressed.
Forests 2020, 11(6), 702; https://doi.org/10.3390/f11060702
Received: 6 May 2020 / Revised: 15 June 2020 / Accepted: 19 June 2020 / Published: 24 June 2020
(This article belongs to the Special Issue Tree Pollen and Floral Biology)
Natural forests are considered a reservoir of great biological diversity constituting one of the most important ecosystems in Europe. Quercus study is essential to assess ecological conservation of forests, and also of economic importance for different industries. In addition, oak pollen can cause high sensitization rates of respiratory allergies in pollen-allergy sufferers. This study sought to know the pollen production of six oak species in the transitional area between the Eurosiberian and Mediterranean Bioclimatic Regions, and to assess the impact of climate change on airborne oak pollen concentrations. The study was conducted in Ourense (NW Spain) over the 1993–2019 period. A Lanzoni VPPS 2000 volumetric trap monitored airborne pollen. A pollen production study was carried out in ten trees randomly selected in several Quercus forest around the Ourense city. Oak pollen represented around 14% of annual total pollen registered in the atmosphere of Ourense, showing an increasing trend during the last decade. Pollen production of the six studied oak species follow the proportions 1:1:2:5:90:276 for Q. ilex, Q. faginea, Q. rubra, Q. suber, Q. pyrenaica, and Q. robur respectively. We detected a significant trend to the increase of the annual maximum temperature, whereas a decrease of the maximum and mean temperatures during three previous months to oak flowering. This could be related with the detected trend to a delay of the oak Main Pollen Season onset of 0.47 days per year. We also found significant trends to an increase of the annual pollen integral of 7.9% pollen grains per year, and the pollen peak concentration of 7.5% pollen grains per year. Quercus airborne pollen monitoring as well as the knowledge of the reproductive behavior of the main oak species, bring us an important support tool offering a promising bio-indicator to detect ecological variations induced by climate change. View Full-Text
Keywords: Quercus; pollen production; climatic change; Aerobiology Quercus; pollen production; climatic change; Aerobiology
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MDPI and ACS Style

Fernández-González, M.; González-Fernández, E.; Ribeiro, H.; Abreu, I.; Rodríguez-Rajo, F.J. Pollen Production of Quercus in the North-Western Iberian Peninsula and Airborne Pollen Concentration Trends during the Last 27 Years. Forests 2020, 11, 702.

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