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1.
F. Javier Rodríguez José Méndez M. Reineria Díaz Victoria Jato Isabel Iglesias 《Aerobiologia》1998,14(2-3):269-276
This is the first data from a pollen survey in Vigo, an Atlantic city in northwest Spain. The pollen calendar for Vigo is
presented, as well as the pollination period for the nine most important allergenic plants. Through 1995, 30 083 pollen grains
belonging to 52 taxa, were recorded using the Lanzoni VPPS 2000 volumetric spore-trap. The most relevant taxa found were:
Urticaceae,Pinus, Poaceae andQuercus (75% of the total pollen),Betula, Castanea, Cupressaceae, Chenopodiaceae, Ericaceae, Myrtaceae,Olea, Plantago, Platanus andRumex (21%), and the final 4% was distributed mainly among pollen types, such as:Corylus, Alnus, Fabaceae, Compositae,Artemisia andCedrus. Of the total annual pollen count, 56% was found in March and April. Another, secondary peak was recorded in June corresponding
to the flowering period of herbaceous species. The high pollen total of Urticaceae (7625 grains, 25% of the total) should
be highlighted. The percentages ofOlea europaea (565 grains) should be noted as well, taking into account its geographical distribution. 相似文献
2.
This study analyzes the pollenrepresentation of Cupressaceae in theatmosphere of Santiago de Compostela (NWIberian Peninsula) during the years 1993–1998.The samples were collected with a Hirstvolumetric spore trap, situated at a height of27 m above ground level on a building situatedin the south of the city. Cupressaceae pollenis present in the atmosphere practically allyear round, although it is predominant in thewinter period along with Alnus andPinus, standing out due to its markedallergenic nature. During the period understudy 5,128 grains were recorded, whichrepresented 5% of the total pollen identified.The principal pollination period for thispollen type in each sampling year and itsintra-diurnal variation were calculated. Thecorrelation between the pollen content of eachyear and the main meteorological parameters islikewise presented. 相似文献
3.
The work was carried out using a Cour trap that sampled the air of the city for 8 consecutive years (1987–1994). The pollen
ofPlatanus hispanica is the fourth most abundant in the air of Seville (a mean of 11.05% of the total pollen collected). The variation throughout
the years in the sum of weekly concentrations ofPlatanus hispanica pollen presents a certain biennial rhythm, in which years of high and low collection of pollen alternate. The starting day
of the main pollination period (MPP) is negatively related with the mean of the mean temperatures for February (r=0.73,r
2=0.53,P=0.0398) and is earlier (at the beginning of March) when the mean temperature for February is high, and vice versa. The pattern
of pollen variation inPlatanus hispanica remains constant through the years—pollen appears abruptly in high weekly concentrations (> 150 grains/m3) in March (sporadically at the beginning of April), with a week of maximum pollen emission (WMPE) in which more than 50%
of the annual pollen is collected (in 6 of the 8 years), and a main pollination period (MPP) of 2 or 3 weeks (except in 1989
when it was 5 weeks). In every year (except 1989), weekly mean temperatures increased during the MPP, the duration of which
depends on mean temperature and mean rainfall: mean temperatures > 16°C and absence of rainfall shorten the MPP, while lower
temperatures and presence of rainfall lengthen it. The meteorological conditions most often found during the WMPE are mean
temperatures > 15°C and rainfall absent or almost so. 相似文献
4.
Airborne pollen sampling in Toledo, Central Spain 总被引:2,自引:0,他引:2
Herminia García-Mozo Rosa Pérez-Badia Federico Fernández-González Carmen Galán 《Aerobiologia》2006,22(1):55-66
Toledo is one of the main tourist spots of Spain, attracting around two million visitors per year. Its geographical situation
in the vast and scarcely monitored Region of Castilla La Mancha and the high number of tourists (especially in the spring)
has resulted in the Spanish Aerobiology Network (REA) making this city a major study objective. Air monitoring studies carried
out using REA sampling procedures commenced in October 2002. Thirty-two pollen types were identified during the sampling period
(October 2002 to October 2004). The annual Pollen Index (PI) was 44124 for the agricultural year October 2002–October 2003,
and 29666 in the same period of 2003–2004. The most abundant taxa were, in decreasing order of dominance: Cupressaceae, Quercus, Poaceae, Populus, Olea, Urticaceae, Platanus, Pinus and Ulmus. Other, less well-represented pollen taxa included Salix, Alnus, Fraxinus and Tamarix, which were characteristic of riverside areas, and Morus, Artemisia and Chenopodiaceae. The presence of Castanea pollen grains originating from chestnut crops far away from the city was clearly an example of long-distance transport. The
highest concentrations of airborne pollen were detected from March to May and also in January, due to the flowering of Cupressaceae
species. In general, there was a correlation between pollen and meteorological parameters: a positive correlation with temperature
and a negative correlation with rainfall and humidity during the pre-peak period. A negative correlation between temperature
and some tree pollen taxa was detected in the principal pollen period correlation analysis due to their long pollination periods. 相似文献
5.
6.
Brett James Green Eija Yli-Panula Mary Dettmann Shannon Rutherford Rod Simpson 《Aerobiologia》2003,19(1):47-55
Relationships between weather parameters andairborne pollen loads of Pinus inBrisbane, Australia have been investigated overthe five-year period, June 1994–May 1999.Pinus pollen accounts for 4.5% of the annualairborne pollen load in Brisbane where thePinus season is confined to the winter months,July–early September. During the samplingperiod loads of 11–>100 grains m3 wererecorded on 24 days and 1–10 grains m3 on204 days. The onset and peak dates wereconsistent across each season, whereas the enddates varied. The onset of the Pinuspollen season coincided with the coolestaverage monthly temperatures (< 22°C),lowest rainfall (< 7mm), and four weeks afterdaily minimum temperatures fell to 5–9°Cin late autumn. Correlations obtained betweendaily airborne Pinus pollen counts andtemperature/rainfall parameters show thatdensities of airborne Pinus pollen arenegatively correlated with maximum temperature(p < 0.0001), minimum temperature (p < 0.0001)and rainfall (p < 0.05) during the mainpollination period. The mean duration of eachpollen season was 52 days; longer seasons wereshown to be directly related to lower averageseasonal maximum temperatures (r2 = 0.85,p = 0.025). These results signify that maximumand minimum temperatures are the majorparameters that influence the onset andduration of the Pinus pollen season inthe environs of Brisbane. Respiratory allergyis an important health issue in Brisbane,Australia, but it remains unknown whether ornot airborne Pinus pollen is acontributing factor. 相似文献
7.
Volumetric data on airborne pollen have been gathered for two consecutive years at a neotropical location (Caracas). Among
the 65 taxa which were identified, pollen from aCupressus species (introduced) and from aCecropia species (indigenous) were dominant. Less numerous but also abundant (daily averages ≥5 grains/m3 air) were pollen from Gramineae, Urticaceae,Alcalypha, Pinus, Piperaceae andMimosa. Pollen grains were recorded daily throughout the year. They increased in numbers during April–May and again during November–December.
The first peak was contributed mainly by indigenous species, the second peak mainly by introduced species. 相似文献
8.
The prevalence of airborne fungal spores and pollen grains in the indoor and outdoor environments of a coir factory in Thiruvananthapuram
district of Kerala state, India was studied using the Burkard Personal Sampler and the Andersen 2-stage Sampler for 2 years
(September 1997 to August 1999). The concentration of pollen grains was remarkably lower than that of fungal spores (ratio
of 1:28). There was no large difference in the concentrations and types of fungal spores between the indoor and outdoor environments,
with 26 spore types found to be present indoors and 27 types outdoors; of these, 22 were common to both the environments. Aspergillus/Penicillium, Cladosporium, ‘other basidiospores’ and ascospores were the dominant spore types. The total spore concentration was highest in February
and lowest in September, and it was significantly higher in 1998–1999 than in 1997–1998. Twenty viable colony-forming types
were isolated from inside the coir factory. The most dominant viable fungi isolated were Penicillium citrinum, Aspergillus flavus and Aspergillus niger. The total pollen concentration was higher in the outdoor environment of the coir factory than indoors, with 15 and 17 pollen
types, respectively. Grass and Cocos nucifera pollen types were dominant. The dominant spore and pollen types trapped in the two environments of the coir factory are reportedly
allergenic and, consequently, workers are at risk of catching respiratory/allergic diseases. 相似文献
9.
Adem Bicakci 《Biologia》2006,61(4):457-461
In this study, pollen grains were identified using Durham sampler in the atmosphere of Sakarya in 2000 and 2001. During these
two years, a total of 10 805 pollen grains were recorded. A total of 5 386 pollen grains per cm2 were recorded in 2000 and a total of 5 419 pollen grains per cm2 in 2001. Pollen fall in the years 2000–2001 comprised grains belonging to 40 taxa and some unidentified pollen grains. Of
these taxa, 22 belonged to arboreal and 18 taxa to non arboreal plants. Total pollen grains consisted of 69.45% grains from
arboreal plants, 28.11% grains from non-arboreal plants and 2.44% unidentified pollen grains. In the region investigated,
Gramineae, Pinus sp., Quercus sp., Cupressaceae/Taxaceae, Salix sp., Platanus sp., Populus sp., Carpinus sp., Fagus sp., Chenopodiaceae/Amaranthaceae, Xanthium sp., Moraceae, Corylus sp., Fraxinus sp., and Urticaceae released the greatest amount of pollen. The season of maximum pollen fall was from March to May, with
a prevalence of arboreal pollen in the first months, and of pollen from non-arboreal plants in the last months of the year. 相似文献
10.
Yves Loublier 《Aerobiologia》1998,14(2-3):291-298
The study aimed to evaluate the possible contamination by passive indoor pollen sedimentation in a laboratory where routine
pollen analyses were conducted, but where no particular laboratory policies were adopted to limit contamination. Gravimetric
pollen deposition was observed on traps (petri dishes soaked with glycerol) set in the palynology laboratory, under an extractor
hood and on the bench beside it over 1 year (1995–1996), and in an air filtered room in a flow cabinet and on its roof over
1 month for comparison. Under the extractor hood, three types of airborne particles were deposited: pollen grains, spores
and algae, representing 32.35, 67.28 and 0.37%, respectively, of the total sedimented particles over 1 year. The number of
pollen grains deposited on the surface trap ranged from 0 (27 November to 4 December 1995) to 707 (10–18 April 1995). The
highest number of taxa during a weekly collection was 23 (9–15 May 1995). The pollen flora represented by anemophilous pollen
(>90% of the trapped pollen) was related to the vegetation next to the laboratory:Acer, Carpinus, Castanea, Corylus, Cupressaceae, Pinus, Quercus, Salix, Taxus for trees and shrubs andArtemisia, Brassicaceae, Plantago, Poaceae, andUrticaceae for grasses and weeds. Indoor pollen deposition corresponded to the period of the outdoor pollination (macroscopic field
observation) which lasted from March to the beginning of August. However, some pollen were almost always present in the collection
(Poaceae, Salix, Castanea, Betula), reflecting the occurrence of pollen grains in the atmosphere out of the pollination period. Moreover, about five times
more entomophilous pollen was found under the extractor hood compared to the other area of the laboratory; even in the flow
cabinet of the air filtered room, 237 particles were captured (versus only 15 on the roof). These data suggest a possible
human contamination during operations under the extractor hood or in the flow cabinet. Although few airborne pollen were found,
possible contamination has to be considered in investigations where even low pollen quantities are of interest. 相似文献
11.
In temperate zones the air temperature influences many aspects of the plant growth and also the time of flowering is often correlated with this environmental parameter. It is a generally accepted idea that higher temperatures in the period preceding ripening of the flowers determine earlier pollination. To verify if a correlation between the air temperature and the date of onset of the pollination period of Quercus spp. exists, a comparative study was carried out over 7 years (1995–2001) in two South-European towns: Vigo (Spain) and Perugia (Italy). Quercus pollen is released in the atmosphere of Perugia on average in the last two weeks of April while in the Spanish region the pollination occurs on average one month before. In order to overcome the dormancy period Perugia requires 1110 Chilling Hours (CH)-884 Growth Degree-Days (GDD°C) and Vigo 709 CH-861 GDD°C. With the Ashcroft method Perugia needs 1075 CH-1000 GDD°C and Vigo 625 CH-1512 GDD°C. Heat accumulation from the end of winter dormancy to the onset of pollination, showed the highest significance when mean temperature in Perugia and maximum temperature in Vigo were used. Every year we have found that the colder station needed a lower heat accumulation: Perugia required a higher quantity of chilling and heat than Vigo. However, the correlation detected between temperature and flowering was, on average, less significant that those found in the same regions for other arboreal taxa that present winter pollination (e.g. Corylus, Alnus). This preliminary study suggests that there is an effect of air temperature on Quercus pollination, but other environmental factors, such as photoperiod, hours of light, rainfall, relative humidity, may be of great influence in determining the onset of pollination in plants with a spring flowering. 相似文献
12.
A study is made of the effect of air temperature on the start of the pollen seasons of three tree species—Ulmus, Platanus andOlea—in the southeastern Iberian Peninsula. These initial results are based on an aerobiological analysis performed over a 4-year
period in the city of Granada, Spain. Sampling was carried out with a Burkard spore trap. The main aim of the present study
was to use regression analysis to identify the preseasonal date when these species start to accumulate heat in their floral
buds, enabling models to be created that indicate the onset of the pollen season for these taxa. ForUlmus there was no significant correlation between the onset of pollination and the mean temperature during the preceding period,
whereasPlatanus presented a significant correlation with mean temperature during the month of January, andOlea with mean temperature during the second fortnight in February and the month of March. ForUlmus, the start of the pollen season ranged between 30 January and 8 February; forPlatanus, between 13 and 17 March; and forOlea, between 20 April and 13 May. The accumulated temperature needed to induce the onset of flowering ranged between 121 and
256°C forUlmus, with values of 428–607°C and 656–881°C forPlatanus andOlea, respectively. 相似文献
13.
Airborne pollen in San Carlos de Bariloche was sampled from September to March 2001–2004 with a Hirst-type volumetric spore
trap placed at a height of 15 m in a city extending from the humid forests, through the mesic forests, to the steppe. The
total amount of pollen recorded varied widely from year to year. The pollen index was 4,395 in the sampling period 2001/2002;
9,055 in 2002/2003 and 2,756 in 2003/2004. The main pollen period extended from October to January. In October, pollen concentration
was the highest. Sixty-six pollen types were identified. Cupressaceae and Nothofagus were the major contributors. Betula, Prunus, Pinus and Populus, the most abundant ornamental taxa in the city, also contributed to the pollen record. Pollen of Maytenus and Lomatia was representative of the mesic forest, while pollen in the lower layers of the humid forest was present in trace amounts.
Cupressaceae, Nothofagus and Betula prevailed during spring (September–December), and Plantago, Rumex and Poaceae during summer (December–March). The association of daily pollen concentration and meteorological variables, temperature
(mean, maximum, minimum), dew point, rainfall and wind speed, was significant. Correlations showed to be negative, with the
exception of that to wind speed. The total sum of fungi spores increased from 1,771 in 2001/2002; through 8,441 in 2002/2003
to 13,782 in 2003/2004. Relative concentration rose to 29%, 48% and 84% of the total number of pollen and fungal spores recorded
during each sampling period. 相似文献
14.
Aycan Bilisik Ayse Yenigun Adem Bicakci Kayi Eliacik Yakup Canitez Hulusi Malyer Nihat Sapan 《Aerobiologia》2008,24(1):61-66
Pollen grains in the atmosphere of Didim, collected using a Durham sampler, were investigated in 2004 and 2005. Weekly pollen
grains per square centimetre were calculated. Over a period of 2 years, 17,518 pollen grains/cm2 belonging to 40 taxa and unidentified pollen grains were recorded. In 2004, 9,879 pollen grains were counted per cm2, and in 2005 the value was 7,639 per cm2. The majority of pollen grains investigated were Pinus spp. (45.58%), Cupressaceae/Taxaceae (13.49%), Olea spp. (9.19%), Platanus spp. (7.62%), Gramineae (6.33%), Pistacia spp. (4.34%), Morus spp. (3.81%), Quercus spp. (2.02%), Abies spp. (1.39%), and Plantago spp. (1.11%). During the month of April, 40.46% of total pollen grains were recorded. According to our results, pollen season
durations for the dominated pollen grains in Didim were: the 7th–33rd weeks for Pinus spp., nearly the whole year except summer for Cupressaceae/Taxaceae, the 17th–29th weeks for Olea spp., the 10th–24th weeks for Platanus spp., the 8th–46th weeks for Gramineae, the 8th–20th weeks for Pistacia spp., the 11th–21st weeks for Morus spp., the 17th–21st weeks for Quercus spp., the 9th–27th weeks for Abies spp., and the 7th–26th weeks for Plantago spp. 相似文献
15.
M. Munuera Giner José S. Carrión García Javier García Sellés 《International journal of biometeorology》1999,43(2):51-63
Detailed results from a 2-year survey of airborne pollen concentrations of Artemisia in Murcia are presented. Three consecutive pollen seasons of Artemisia occurring each year, related to three different species (A.
campestris, A.
herba-alba and A.
barrelieri), were observed. A winter blooming of Artemisia could explain the incidence of subsequent pollinosis in the Murcia area. With regard to meteorological parameters, mathematical
analyses showed relationships between daily pollen concentrations of Artemisia in summer–autumn and precipitations that occurred 6–8 weeks before. The cumulative percentage of insolation from 1 March
seemed to be related to blooming onsets. Once pollination has begun, meteorological factors do not seem to influence pollen
concentrations significantly. Intradiurnal patterns of pollen concentrations were similar for late summer and winter species
(A. campestris and A.
barrelieri). During autumn blooming (A.
herba-alba), the intradiurnal pattern was particularly erratic. Theoretical values of wind run were obtained for each pollen season
by the graphical sum of hourly wind vectors. When theoretical wind run was mapped onto the vegetation pattern, supposed pollen
source locations were obtained for each hour. By comparing supposed hourly pollen origins with the intradiurnal patterns of
pollen concentrations, it can be seen that this simple model explains variations in mean pollen concentrations throughout
the day.
Received: 6 May 1998 / Revised: 24 February 1999 / Accepted: 12 March 1999 相似文献
16.
Cytological details of endosperm development after pollination with irradiated pollen were studied in Actinidia deliciosa (kiwifruit) cultivar Hayward. Pollinations were carried out involving five different sources of pollen (Matua, Tomuri, Burt,
Berryman, and fruiting male) irradiated with gamma rays at doses of 700 and 900 Gy. Non-irradiated crosses were used as controls.
Irradiated pollen induced development of approximately 25–30% of the ovules. Two types of ovules were observed: (1) with both
embryo and endosperm and (2) with endosperm only. No mitotic abnormalities were found in control or irradiated endosperms.
Mitotic divisions were regular and nuclei spherical and evenly spaced. However, the cells of irradiated endosperm usually
contained low amounts of storage products. Ploidy level of the endosperms was evaluated by nuclear size (volume) with the
use of image analyzis. Mean nuclear size in control and irradiated endosperms was 1598.3 and 750.9 μm3, respectively. It is concluded that endosperm produced after pollination with irradiated pollen is autonomous and represents
the 2n level.
Received: 14 October 1998 / Revision accepted: 10 March 1999 相似文献
17.
Vigo is a city located in the northwest of the Iberian Peninsula. Influenced by the Atlantic climate, it is surrounded by
a Eurosiberian-type vegetation, modified by the introduction of forestry and ornamental species. Different ruderal vegetation
types, resulting from human influence, grow in the area. The study of the pollen content of the air of Vigo started in 1989,
with a Cour trap. Average results for the period 1989–1995 are presented in this paper, together with the lowest and highest
values found. The representativeness of the mean values is analysed by calculating the coefficient of variation of the data
series. Most pollen types in the atmosphere of Vigo are from tree species (54.2%); an important proportion comes from herb
species (43.9%) and very few (1.8%) correspond to shrub species. A total of 73 different pollen types have been identified.
The most abundant, listed in decreasing order of mean annual values for the period, are:Pinus (25.1%), Poaceae (21.1%), Urticaceae (14.6%),Quercus (8.5%),Castanea (3.7%),Betula (3.6%),Eucalyptus (3.4%),Plantago (3.2%),Alnus (2.1%), Cupressaceae (2.1%), Oleaceae (1.6%;Olea 1.3%),Platanus (1.3%),Rumex (1.3%), Chenopodiaceae/Amaranthaceae (1.0%), Ericaceae (0.8%), Asteraceae (0.6%;Artemisia 0.1% andTaraxacum type 0.2%) andMercurialis (0.5%). A pollen calendar showing the annual dynamics of all these pollen types is presented in this paper. A parallel study
of the clinical importance of respiratory allergies in Vigo was also conducted. From a sample of 2750 patients, 87.2% suffered
from rhinoconjunctivitis, 26.0% of these due to pollen, and 78.3% from asthma, 17.2% due to pollen. The pollen types responsible
for these allergies, listed in decreasing order, are: Poaceae (78%),Parietaria (12%),Chenopodium (11%),Plantago (9%), Oak (4%),Artemisia (3%),Pinus (3%),Eucalyptus (3%),Olea (2%),Platanus (2%),Castanea (2%),Taraxacum (2%),Rumex (2%),Betula (1%),Cupressus (1%) andMercurialis (1%). 相似文献
18.
Daniela S. Nitiu 《Aerobiologia》2006,22(1):79-87
A continuous aeropalynologic survey of the atmosphere of La Plata was carried out between July 1998 and June 2001 in order
to study flowering development from winter to summer using a Lanzoni volumetric spore trap. The total pollen spectrum was
represented by 79 pollen types. Between 10 and 12 pollen types showed a relative concentration of more than 1% of the annual
total. Airborne pollen was mainly represented by Platanus, Fraxinus, Cupressaceae, Poaceae, Urticaceae, Cyperaceae, Myrtaceae, Celtis, Casuarina and Morus during the 3-year period. Acer and Ambrosia pollen types were only dominant in the first 2 years. Maximum absolute concentrations were recorded in the the July 1998–June
1999 period, and the minimum concentrations were recorded in the July 2000–June 2001 period. The contribution of the arboreal
pollen grains was higher than 68% relative to the annual total for each year. Two periods of maximum pollen emissions were
found for each year: pollen from aboreal taxa predominated from July to October, and pollen from herbaceous taxa predominated
from November to March. There was very little pollen in the atmosphere between April and June. The maximum arboreal and herbaceous
pollen emissions were recorded during hours of daylight: at 10:00 and 14:00 hours. 相似文献
19.
Silva Palacios I Tormo Molina R Nuñoz Rodríguez AF 《International journal of biometeorology》2000,44(3):128-133
The daily pollen concentration in the atmosphere of Badajoz (SW Spain) was analysed over a 6-year period (1993–1998) using
a volumetric aerobiological trap. The results for the main pollination period are compared with the number of hours of wind
each day in the four quadrants: 1 (NE), 2 (SE), 3 (SW) and 4 (NW). The pollen source distribution allowed 16 pollen types
to be analysed as a function of their distribution in the four quadrants with respect to the location of the trap. Four of
them correspond to species growing in an irrigated farmland environment (Amaranthaceae-Chenopodiaceae, Plantago, Scirpus, and Typha), five to riparian and woodland species (Salix, Fraxinus, Alnus, Populus, and Eucalyptus), four to urban ornamentals (Ulmus, Arecaceae, Cupressaceae, and Casuarina), and three which include the most frequent pollen grains of widely distributed species (Poaceae, Quercus, and Olea). The results show that the distribution of the sources and the wind direction play a very major role in determining the
pollen concentration in the atmosphere when these sources are located in certain quadrants, and that the widely distributed
pollen sources show no relationship with wind direction. In some years the values of the correlations were not maintained,
which leads one to presume that, in order to draw significant conclusions and establish clear patterns of the influence of
wind direction, a continuous and more prolonged study will be required.
Received: 6 May 1999 / Revised: 30 March 2000 / Accepted: 31 March 2000 相似文献
20.
Short-term prediction of Betula airborne pollen concentration in Vigo (NW Spain) using logistic additive models and partially linear models 总被引:1,自引:0,他引:1
Cotos-Yáñez TR Rodríguez-Rajo FJ Jato MV 《International journal of biometeorology》2004,48(4):179-185
Betula pollen is a common cause of pollinosis in localities in NW Spain and between 13% and 60% of individuals who are immunosensitive to pollen grains respond positively to its allergens. It is important in the case of all such people to be able to predict pollen concentrations in advance. We therefore undertook an aerobiological study in the city of Vigo (Pontevedra, Spain) from 1995 to 2001, using a Hirst active-impact pollen trap (VPPS 2000) situated in the city centre. Vigo presents a temperate maritime climate with a mean annual temperature of 14.9 °C and 1,412 mm annual total precipitation. This paper analyses two ways of quantifying the prediction of pollen concentration: first by means of a generalized additive regression model with the object of predicting whether the series of interest exceeds a certain threshold; second using a partially linear model to obtain specific prediction values for pollen grains. Both models use a self-explicative part and another formed by exogenous meteorological factors. The models were tested with data from 2001 (year in which the total precipitation registered was almost twice the climatological average overall during the flowering period), which were not used in formulating the models. A highly satisfactory classification and good forecasting results were achieved with the first and second approaches respectively. The estimated line taking into account temperature and a calm S–SW wind, corresponds to the real line recorded during 2001, which gives us an idea of the proposed models validity. 相似文献