Dribbelkont schreef:wanneer heeft een exemer het meeste jeuk?
met geen windt en broeierig weer?
In dit artikel kan je het één en ander lezen over omgevingsfactoren: Identification of environmental factors affecting the prevalence of insect bite hypersensitivity in Shetland ponies and Friesian horses in the Netherlands
Stukje gekopieerd over invloed van het klimaat:
Climate
The model showed that an increase in climate by one unit
decreased the prevalence of IBH by -0.07%. The difference
between extreme climates was 6.2% of IBH prevalence, where the
effect is corrected for all other factors in the model. The extreme
climates affecting prevalence are shown in Figure 5. Although the
effect of rainfall contributed only for a small part in the variable
climate, rainfall was negatively related to prevalence of IBH,
therefore, regions with a larger rainfall had a lower prevalence. The
number of cold days/year was also negatively related to
prevalence, in contrast to the number of warm days/year. These
results confirm expectation, because midges prefer warm, dry
weather (Meiswinkel et al. 2000). In contrast to the results of this
study, Braverman et al. (1983) found no significant difference
between rainfall and the number of horses affected by IBH in
Israel. These authors also studied the relationship between
topographical areas and distribution of horses affected by IBH, but
data used were not sufficient to indicate an effect. In agreement
with the present results, Broström and Larsson (1987) found a clear
difference in prevalence of IBH between different postal areas of
Sweden, a regional variation of 7.7–53.8%. Meiswinkel et al.
(2000) studied culicoides for their prevalence in combination with
climatic data in South Africa. The prevalence was measured by
culicoides caught in traps. The number caught increased on
warmer, drier evenings but were suppressed by high wind speeds.
Low numbers were obtained after a day of heavy rain. The model
in that study showed that temperature was related positively, and
humidity and wind speed related negatively to number caught.
Additional weather variables did not improve the fit of their model.