Annual variations in the concentrations of<i>Betula</i>pollen in the London area, 1961–1990

Emberlin, Jean; Savage, M; Woodman, Richard

doi:10.1080/00173139309428965

Cited by 110 publications

(67 citation statements)

References 11 publications

(3 reference statements)

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“…Our findings, that in the case of several taxa, significant correlation can be found between the pre-seasonal temperature and the start of pollination, agree with published data (Spieksma et al 1995, Gonzalez Minero & Candau 1996, Frenguelli et al 1991Emberlin et al 1993).…”

Section: Discussionsupporting

confidence: 83%

“…the last day on which the concentration was still consistently over 3 grains/m 3 , or the date calculated by the 5%-method. The start-and end-dates were also calculated by the £25, Z50, S75, X100 (Dreissen et al 1990), 1% (e.g., Emberlin et al 1993), 2.5% (Andersen 1991) and 5% methods, and were compared to the results achieved by the above mentioned definition.…”

Section: Methodsmentioning

confidence: 99%

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An examination of the main characteristics of the pollen seasons in Budapest, Hungary (1991–1996)

Fehér¹,

Járai‐Komlódi

1997

Grana

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Section: Discussionsupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

An examination of the main characteristics of the pollen seasons in Budapest, Hungary (1991–1996)

Fehér¹,

Járai‐Komlódi

1997

Grana

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“…The urban heat island can, for example, advance the flowering of grasses within a city compared with on the outskirts (Emberlin et al, 1993;Rodríguez-Rajo et al, 2010), whilst the onset of flowering in Platanus trees has been reported to differ between different areas of the same city (Alcázar et al, 2004). In the present study, the dates of transition between the three periods were found to differ between monitoring stations by up to 4 days, meaning that differences in diurnal pattern were found over distances under 5 km.…”

Section: Could Flowering Time Explain the Three Periods?mentioning

confidence: 99%

Seasonal variation in diurnal atmospheric grass pollen concentration profiles

et al. 2014

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Abstract. In this study, the diurnal atmospheric grass pollen concentration profile within the Danish city of Aarhus was shown to change in a systematic manner as the pollen season progressed. Although diurnal grass pollen profiles can differ greatly from day-to-day, it is common practice to establish the time of day when peak concentrations are most likely to occur using seasonally averaged diurnal profiles. Atmospheric pollen loads are highly dependent upon emissions, and different species of grass are known to flower and emit pollen at different times of the day and during different periods of the pollen season. Pollen concentrations are also influenced by meteorological factors -directly through those parameters that govern pollen dispersion and transport, and indirectly through the weather-driven flowering process. We found that three different profiles dominated the grass pollen season in Aarhus -a twin peak profile during the early season, a single evening profile during the middle of the season, and a single midday peak during the late season. Whilst this variation could not be explained by meteorological factors, no inconsistencies were found with the theory that it was driven by a succession of different grass species with different diurnal flowering patterns dominating atmospheric pollen loads as the season progressed. The potential for exposure was found to be significantly greater during the late-season period than during either the early-or mid-season periods.

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“…There is a tendency for high pollen counts of C. japonica to appear in two or three year cycles. In 1985In , 1988In , 1993In and 1996, when high C. japonica pollen counts were recorded, the mean July temperatures of previous years were 25.4°C, 25.4°C, 25.7°C, 24.6°C and 26.9°C, respectively. All of these July temperatures were higher than the average mean July temperature (24.5°C).…”

Section: Discussionmentioning

confidence: 99%

“…15 The atmospheric pollen counts of most species were affected by meteorological factors. [16][17][18][19][20][21] In the case of C. japonica, the atmospheric pollen counts had a high positive correlation with the mean temperature in July of the previous year. When the mean July temperatures were above 24.5°C, high atmospheric pollen counts of C. japonica were observed in the following year.…”

Section: Discussionmentioning

confidence: 99%

The formation of pollen in male flowers and yearly atmospheric pollen counts of Cryptomeria japonica in the following year

1998

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Prediction of yearly atmospheric pollen counts is a very important component in the prevention of allergenic symptoms. We investigated the relationship between atomspheric pollen counts and the formation of male flowers of Cryptomeria japonica D. Don (C. japonica). An atmospheric pollen survey of C. japonica was conducted from 1983 to 1996 using a Durham's sampler. A regression analysis was performed between the total pollen count and July temperature in previous years. The atmospheric pollen counts of C. japonica had a high positive correlation with the mean temperature in July of the previous year. However, the predicted using average mean July temperature records of the previous year were insufficient, especially in years following high pollen count. In experimental conditions, using 60 C. japonica trees in pots, the formation of male flowers was shown to increase with a rise in incubation temperature. In a forest of C. japonica, our results showed that the length and weight of new needle growth from old needles, which produced many flowers in the previous year, were shorter and lighter, respectively. These aerobiological and plant physiological studies provide evidence that a smaller number of pollen counts are a common result in a year following one in which many male flowers are produced, even if the mean July temperature of that year was high.

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Annual variations in the concentrations ofBetulapollen in the London area, 1961–1990

Cited by 110 publications

References 11 publications

An examination of the main characteristics of the pollen seasons in Budapest, Hungary (1991–1996)

An examination of the main characteristics of the pollen seasons in Budapest, Hungary (1991–1996)

Seasonal variation in diurnal atmospheric grass pollen concentration profiles

The formation of pollen in male flowers and yearly atmospheric pollen counts of Cryptomeria japonica in the following year

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