Relationships between flowering development of<i>Ulmus pumila</i>and<i>Fraxinus excelsior</i>and their airborne pollen

Latorre, Fabiana; Bianchi, Martha S.

doi:10.1080/00173139809362672

Cited by 24 publications

(18 citation statements)

References 20 publications

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“…Wagner (1959) showed that the anther dehiscence of ragweed (Ambrosia artemisiifolia) did not occur until humidity dropped to 80% or below. Reddi et al (1988) showed that rainfall inhibit pollen release of some species but did not affect other ones from Poaceae family, whereas Latorre and Bianchi (1998) found a delay between the rainfall occurrence and an airborne pollen decrease directly related to floral phenology of elm (Ulmus pumila) and ash (Fraxinus excelsior). Accordingly, pollen emission seems to be strongly influenced as shown in Fig.…”

Section: Discussionmentioning

confidence: 96%

An evaluation of the airborne pollen–precipitation relationship with the superposed epoch method

2009

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A statistical analysis was performed on a sample of 4 days sequences in which rainfall occurred during the second day, in order to establish airborne pollen-precipitation relationships. Drizzle (precipitation B 1 mm) and rain (precipitation [ 1 mm) events were considered as well as arboreal or non-arboreal pollen. Results showed that arboreal pollen decreases synchronically with the occurrence of a drizzle, registering the minimum value the following day of the precipitation occurrence. The high frequencies of fog and wet soil associated with the following day of drizzle occurrence support the hypothesis that besides the wash out, airborne pollen concentration could decrease by nucleation and impaction processes. As well, diurnal variation suggests that high humidity conditions could also affect pollen emission as already demonstrated by other authors.

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Section: Discussionmentioning

confidence: 96%

An evaluation of the airborne pollen–precipitation relationship with the superposed epoch method

2009

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“…Studies report positive correlations between phenological development and pollen counts in various tree genera, e.g. Quercus (Gómez Casero et al 2007), Ulmus and Fraxinus (Latorre and Bianchi 1998), Betula (Jato et al 2002), Alnus, Corylus and Betula (Kasprzyk 2003) and…”

Section: Discussionmentioning

confidence: 96%

Study of Poaceae phenology in a Mediterranean climate. Which species contribute most to airborne pollen counts?

et al. 2010

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The present study sought to determine which of the common Poaceae species in the study area contribute most to the Poaceae pollen season curve, and to determine the phenological behaviour of the species studied. The different floral phenophases in thirty-three Poaceae species common in and around the city of Córdoba (SW Iberian Peninsula) were checked periodically over the period 2004-2006. Results showed that longer phenological ranges were recorded in the coolest and wettest year, and shorter ranges in the warmest and driest year. Moreover, ranges varied as a function of altitude: populations in lower-lying areas flowered earlier than those at higher altitudes. The results, taken in conjunction with the findings of preliminary research into potential pollen production, showed that probably only four of the Poaceae species studied-Dactylis glomerata, Lolium rigidum, Trisetaria panicea and Vulpia geniculatawere major contributors to the Poaceae airborne pollen curve.

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“…The fact that rainfall reduces the number of pollen grains in the air is a very well-known phenomenon (Jato et al 2002;Latorre and Bianchi 1998;Pérez et al 2009). Relative humidity causes a similar depressing effect on particles in suspension if compared with precipitations.…”

Section: Discussionmentioning

confidence: 98%

First report of phytoliths in the air of Argentina

2011

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A first analysis of airborne phytoliths was carried out in Mar del Plata, Argentina. Its primary aims were to characterize the phytolith morphotypes present in the atmosphere, to quantify their abundance and to detect whether seasonal variations exist throughout the year. The standard method was used for monitoring airborne particulate matter applying a Hirst-type suction bioaerosol sampler. The mean daily phytoliths concentrations (p/m3) were calculated for eight selected days from the driest year, 1993, bearing in mind that its atmospheric conditions could favour the presence of biomineralizations in the air. The amount of phytoliths reached was of 1,543. It was composed of 61% isolated and 1% articulated types. The rest were unknown or unidentified phytoliths (38%). The most abundant morphotypes (72.1% of those identified) were elongates, followed by rondels (16.1%) already described for Poaceae subfamilies, such as Pooideae and Stipoideae. Finally, trapeziform and point shaped were identified with 3.8 and 3.4%, respectively. A lower abundance of silica particles was detected on high wind speed days from the south (sea coast) and under wetter conditions. Maximum phytoliths concentrations were recorded in winter when pasture burning is carried out alongside ploughing; this also coincides with the period in which soils were not covered by vegetation. These results shed light on the importance of considering the potential ways of phytoliths dispersion and the factors that could be affecting their aerial transport, especially when they are applied to the interpretation of paleovegetation from phytolith fossil records.

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Relationships between flowering development ofUlmus pumilaandFraxinus excelsiorand their airborne pollen

Cited by 24 publications

References 20 publications

An evaluation of the airborne pollen–precipitation relationship with the superposed epoch method

An evaluation of the airborne pollen–precipitation relationship with the superposed epoch method

Study of Poaceae phenology in a Mediterranean climate. Which species contribute most to airborne pollen counts?

First report of phytoliths in the air of Argentina

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