Rythmes nycthéméraux de la pollinisation de quelques taxons allergisants

Laaidi, Mohamed; Thibaudon, M.

doi:10.1080/12538078.2002.10515974

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…This would suggest that onion pollen is more available in the morning. 27 have found that there are plants whose pollen is liberated abundantly only in the morning. 28 found that honeybees harvested more pollen in plots not enriched in nitrogen and phosphorus.…”

Section: Resultsmentioning

confidence: 99%

Diversity of flowering insects of Allium cepa L. 1753 (Liliaceae) at Dogba and Gazawa (Diamaré, Far North Region, Cameroon)

2019

jcbsc

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To study the flowering entomofauna of onion Allium cepa L. 1753, eight flowering seed plots (due to four per locality) were monitored from February 10 to March 30, 2013 at Dogba and from February 13 to April 4, 2014 at Gazawa. The species richness, the relative frequency, the desired food products, the daily regularity of the various species of flowering insects and their abundances per flower and per umbel were determined. The specific diversity of onion flowering insects was 58 and 26 species respectively at Dogba and Gazawa. These insects visited the flowers of this plant species for nectar, pollen, petals or sap. The low diversity of insects on the flowers in Gazawa is believed to be a consequence of a disturbance due to the misuse of pesticides in the onion plots in this locality. The relative frequency of Apis mellifera visits was 15.30% and 32.37% at Dogba and Gazawa respectively. The high diversity of insects at Dogba influenced the relative frequency of Apis mellifera visits. The insect species observed daily on the flowers during the investigations and in both sites were Apis mellifera, Seladonia sp.1 and Phylanthus triangulum. In the morning, the frequency of insects on the flowers was higher with a peak of activity between 8-9h. The abundance per flower was one for all the visiting insects of the flowers. The highest mean umbel abundance Diversity… Denis DJONWANGWE et al.

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Section: Resultsmentioning

confidence: 99%

Diversity of flowering insects of Allium cepa L. 1753 (Liliaceae) at Dogba and Gazawa (Diamaré, Far North Region, Cameroon)

2019

jcbsc

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“…Climatic conditions such as temperature, humidity and luminosity affect the start, duration and intensity of pollination, creating differences in pollination calendars across Europe [3, 6]. The beginning and end of pollination are strongly correlated with temperature.…”

Section: Pollination Calendarsmentioning

confidence: 99%

“…The quantity of pollen released into the air is correlated with the amount of insolation during the months prior to flowering [2, 3]. During the pollination period, Pooideae grasses react differently, some of them pollinating in the morning, others in the evening, others all day long [6]. Nevertheless, all species pollinate during the spring and summer months.…”

Section: Pollination Calendarsmentioning

confidence: 99%

Exposure to grass pollen in Europe

Jaeger¹

2008

Clin Exp All Rev

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Summary Pooideae encompass both common wild and cultivated grasses, which are responsible for grass pollen exposure and sensitization in Europe. Across Europe, the pollination period of different members of this subfamily overlap and hayfever sufferers are therefore naturally exposed to a mixture of pollens from different grass species. Because of their morphological homology, Pooideae pollens are evaluated together in pollen counts and cannot be distinguished. Neither patients themselves, nor physicians can link the onset of hayfever symptoms to a specific grass species.

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Intradiurnal variation of allergenic pollen in the city of Porto (Portugal)

2008

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This study reports the hourly distribution of the allergenic airborne pollen types more abundant in the atmosphere of Porto (Portugal) during the studied period. This knowledge will allow an adequacy daily routine for allergic patients during the hours of higher airborne concentrations. The airborne pollen concentration was continuously performed from January 2003 to December 2007 in the city of Porto using a Hirst-type volumetric sampler. Urticaceae, Cupressaceae, Acer spp., and Plantago spp. airborne pollen presented higher concentrations in the morning, while Alnus spp. and Betula spp. pollen were mainly present during the afternoon. Olea europaea and Platanus spp. pollen were regularly distributed along the day, while Poaceae and Pinus spp. pollen presented two diurnal maxima.

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Rythmes nycthéméraux de la pollinisation de quelques taxons allergisants

Cited by 6 publications

References 12 publications

Diversity of flowering insects of Allium cepa L. 1753 (Liliaceae) at Dogba and Gazawa (Diamaré, Far North Region, Cameroon)

Diversity of flowering insects of Allium cepa L. 1753 (Liliaceae) at Dogba and Gazawa (Diamaré, Far North Region, Cameroon)

Exposure to grass pollen in Europe

Intradiurnal variation of allergenic pollen in the city of Porto (Portugal)

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