The main pollen season of<i>Parietaria</i>in Genoa (Italy): forecast possibilities

Arobba, Danièle; Imperiale, Guido; Negrini, Arsenio Corrado

doi:10.1080/00173139209432037

Cited by 8 publications

(7 citation statements)

References 5 publications

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“…This pattern fits with data observed for the same family in Genoa (Arobba et al 1992), a city also located in the Mediterranean basin. These authors found a high and significant correlation between the sum of the mean daily temperatures and the number of the days from the first of January to the date of the beginning of the main pollen season.…”

Section: Discussionsupporting

confidence: 89%

Phenology and pollen production of Parietaria judaica L. in Catalonia (NE Spain)

Guàrdia

Belmonte

2004

Grana

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pollen production was estimated from periodical records in three permanent plots per zone. Moreover, records of airborne Urticaceae pollen were obtained daily by means of Hirst spore traps operating in each zone.Parietaria judaica grows vegetatively and reproductively throughout the year, but intensity of these phenological phases peaks in Spring. The number of pollen grains per anther range from 35 744 to 86 333, and average pollen production is 2 350610 6 pollen grains per square meter, both varying significantly between months and zones.Urticaceae pollen is present in the atmosphere year round, and concentration values of airborne pollen are highest in Spring. Correlation between airborne pollen values and pollen production is significant in the three study areas.

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Section: Discussionsupporting

confidence: 89%

Phenology and pollen production of Parietaria judaica L. in Catalonia (NE Spain)

Guàrdia

Belmonte

2004

Grana

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“…Several studies have been published based on different methods for forecasting the pollination of different pollen taxa , with the parameters to be forecast differing according to their definition. Regarding the start of pollination, Stix [26] defined it as the day of the year on which 2% of the total of the pollens of the same taxon in the total counts for the last 35 years appear, at each count site [21][22][23][24][25], with a palinological criterion. But it can also be defined as the day on which each taxon reaches the level established as the threshold for causing symptoms in patients, thus being a clinical criterion.…”

Section: Introductionmentioning

confidence: 99%

“…The length of the pollination season is defined by Stix [26] as the time between the day pollination begins and the appearance of 98% of the total pollens of each taxon, being, like in the previous case, a value relative to each count site [17,18,[21][22][23][24][25]. The start of the season, according to the study by Emberlin [25], begins at cumulated total pollen counts of 75/100 and the same criterion as Stix used to define the length of the season.…”

Section: Introductionmentioning

confidence: 99%

“…It would be more useful for the allergist to use a clinical criterion, which would be the days of potential pollination above the symptom threshold. Regarding the method and constants to be used, there are different appreciation criteria for each author [10,11,[19][20][21][22]25], depending on the weather, the type of taxon and its importance regarding the sensitization of patients in each specific area. The sensitivity of the forecasting might be for periods (10 days) or for days.…”

Section: Introductionmentioning

confidence: 99%

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Pollen allergy in the Bilbao area (European Atlantic seaboard climate): pollination forecasting methods

Antépara

Fernández

Gamboa

et al. 1995

Clin Experimental Allergy

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Forecasting pollination can help the allergist to establish the appropriate treatment and advice for patients. Based on previous studies, we have related the climate variables with the grass pollen counts in the search for pollination predictors. By relating the meteorological data of the temperature recorded every 6 h and of the rainfall in hourly periods, together with the daily pollen counts obtained by the Hirst volumetric system, over a period of 3 years, we have tried to predict the start, duration and severity of the grass pollination, as well as the days of peak pollination. We have established a relationship by means of a polynomic regression originating from the mean cumulated temperature higher than 9 degrees C [R2 = 0.927 (P = 0.0001)], with the pollination season starting from 300 degrees C and the maximum peak at 356 degrees C, in the 3 years of the study. During the days of pollination, peaks higher than 50 grains/m3 coincide with average daily temperatures of 18.7 +/- 3 and lower than 50 grains/m3 with temperatures of 16.8 +/- 3 (significant to 95%). The duration of the pollination is influenced by the cumulated average temperatures (from 800 to 900 degrees C) and especially by precipitation at the start of and during pollination. In order to forecast grass pollination, the cumulated average temperatures are useful, starting from a basal (9 degrees C), pollination begins when this sum is greater than 300 degrees C, whereas when 800 degrees C is reached and depending on the rainfall during the season, pollination will end.(ABSTRACT TRUNCATED AT 250 WORDS)

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“…Others have analysed the behaviour at specific locations. These include the work of Díaz de la Guardia et al (1998) in Granada, Galán et al (2000) in Có rdoba, Trigo et al (1996) in Málaga, and Vega et al (2003) in Leó n, and, outside the Iberian Peninsula, of Arobba et al (1992) in Genova (Italy), Corden & Millington (1991) in Derby (UK), Emberling & Norris-Hill (1991) in London (UK), Fornaciari et al (1992) in Perugia (Italy), and RizziLongo et al (2004) in Trieste (Italy).…”

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confidence: 97%

Urtica membranaceaand the importance of its separation from the rest of the Urticaceae in aeropalynological studies carried out in the Mediterranean region

Rodríguez

Palacios

Molina

et al. 2006

Plant Biosystems - An International Journal Dealing with all As

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The aerobiological behaviour of the Urtica urens and Urtica membranacea pollen types was analysed in Badajoz and Mérida (SW Spain) in order to determine the importance of separating them in studies carried out within the area of distribution of Urtica membranacea. In the two study sites, Urticaceae pollen concentrations in the atmosphere ranged between 1055.7 and 2866.2. This puts them in an intermediate position among the locations that have been studied in the Iberian Peninsula. Annually, more than 25% of these amounts corresponded to Urtica membranacea pollen. The Urtica urens pollen type was present in the atmosphere almost all year round, although its maximum concentrations occurred in February. Its daily concentrations correlated negatively with temperature, wind speed, and westerly winds, and positively with relative humidity, calm periods, and easterly winds. The annual index seemed to be negatively influenced by winter rainfall, and positively by winter maximum temperatures. The hourly pattern of pollination showed low concentrations throughout the night, and a single peak between noon and early afternoon. Urtica membranacea pollen was present in the atmosphere from February to May, and its maximum concentrations occurred between March and April. While its daily variations did not seem to be consistently influenced by any of the meteorological factors analysed, the annual indices positively correlated with the minimum temperatures, which also affected the beginning and the duration of the principal pollination period. The hourly pattern of pollination showed that its presence was not restricted to the early afternoon, but that, on occasions, its maximum concentration occurred at the end of the day (up to midnight).

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The main pollen season ofParietariain Genoa (Italy): forecast possibilities

Cited by 8 publications

References 5 publications

Phenology and pollen production of Parietaria judaica L. in Catalonia (NE Spain)

Phenology and pollen production of Parietaria judaica L. in Catalonia (NE Spain)

Pollen allergy in the Bilbao area (European Atlantic seaboard climate): pollination forecasting methods

Urtica membranaceaand the importance of its separation from the rest of the Urticaceae in aeropalynological studies carried out in the Mediterranean region

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