Birch (betula) pollen incidence in france (1987–1990)

Abstract

An analysis of the pollen content in the air in six French towns (Besanqon, Nancy, Strasbourg, Paris, Amiens and Lyon) since 1987 has provided a comparison of the characteristics of the birch (Bettila) pollen season. Single and multiple correlation methods associating both pollen and climatic parameters (particularly air temperature) were tested. The starting dates of the pollen season were observed in the six stations and compared with the estimated dates using different methods. Good correlation coefficients were obtained if the data from the year 1990, when exceptional climatic conditions prevailed, are excluded.Pascale Ruffaldi (polIen analysis) and Franqoise Greffler (statistics), Laboratoire de CiironoEcologie URP 7557, CRAICNRS, 16. route de Gray, 2S030 Besanpn Cedex, France.

Betula pollen: One of the most important aeroallergens in Ourense, Spain. Aerobiological studies from 1993 to 2000

“…Heat accumulation values for 1993 and 1998 were similar, reaching an average 267°C; similar values were observed in Ruffaldi and Greiffier (1991), who reported an accumulated temperature value of approximately 280°C at the start of pollination.…”

“…1998) did not even Goldberg et al (1988) also report considerable variations from year to year. Significant variations were observed in the length of the main pollination period; similar variations in duration have been recorded for previous years in Ourense (Iglesias, 1990), in Santiago de Compostela (Aira et al 1998), and in various parts of France (Ruffaldi & Greiffier, 1991). Johansen (1991) also observed considerable variations duration of the main birch pollination period in Norway.…”

Short-term prediction of Betula airborne pollen concentration in Vigo (NW Spain) using logistic additive models and partially linear models

“…Pollen concentration predictions are usually long-term, trying to predict the onset and severity of the pollen season. Such models published recently have used, as prediction values, the sum of temperatures starting from a certain date (Clot 2001;Caramiello et al 1994;Ruffaldi and Greffier 1991) or different phenological variables such as the chilling units and growing degree days required to trigger the phenological phase of flowering (Andersen 1991;Laaidi 2001;Jato et al 2002). Another type of model aims at making short-term predictions of concentration, e.g.…”

Relationship between air temperature and the start of pollen emission in some arboreal taxa in Southwestern Spain

“…Recent years have seen abundant literature relating air temperature to the start of pollen emission: Betula and Pinus (Jazon et al 1977), Betula (Kupias 1977), Ulmus campestris and Taxus baccata (Richard 1985), Olea europaea and Gramineae (Frenguelli et al 1989), Alnus and Populus (Frenguelli et al 1991), Betula (Ruffaldi & Gref®er 1991), Alnus, Ulmus and Betula (Andersen 1991), Corylus avellana (Frenguelli et al 1992), and Olea europaea (Gonza Âlez Minero & Candau 1996). At the same time, the public dissemination of pollen information via the communication media and computer-based networks has become increasingly widespread and expected.…”