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Master Thesis

Santé de l'abeille domestique en paysage agricole

Abstract : The honeybee, as numerous other animal and vegetal species, is in general decline. Many factors are suspected to be involved, either alone or in combination but all related with a global change, particularly the evolution of apicultural and agricultural practices and the arrival of new diseases and parasites. The intensification of agricultural landscapes decreases the availability of resources and the crop protection exposes the honeybee colonies to pesticides. Nevertheless, a deficiency of nutrition in terms of quantity, quality, or diversity and some pesticides can lead to worsening of sanitary states of colonies. That is why the hypothesis is emitted, considering that several foraging environment in terms of agricultural practices, intensification and land uses can lead to a variability of sanitary states of colonies. Honeybee health is not just defined by the absence of diseases, but also by an important adult population, which well fed, able to produce brood and having a fertile queen. The follow-up of colonies in open space and under professional apicultural conditions permit to put in relation the honey bee health with landscaping parameters. The pathologies are first described (frequency of occurrence, annual evolution) and as no strong correlation has been found, two indicators of honeybee health has been created by a multivariate Analysis, and together with the varroa pressure, have been used in analyzing the effect of honey bee health on essential hive parameters. Diseases seem then to affect the most efficient colonies considering the production of brood, adult and honey harvest. Only the varroa population has been shown to be related to the tested landscaping parameters. In the foraging environment of 2km, the most important is the proportion of cultures under crop protection and offering nectar and/or pollen resources, the most population of varroa are present in the hive. To conclude with, the study put a lower place for the diseases and reproduction accidents in the puzzle of weakening factors during the season. In our agricultural landscapes, crop protection products, quality, quantity and diversity of pollen seem to have a direct influence on colonies more important that the indirect ones on diseases.
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Master Thesis
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Submitted on : Monday, October 15, 2012 - 1:17:21 PM
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Mathilde Roger. Santé de l'abeille domestique en paysage agricole. Sciences agricoles. 2012. ⟨dumas-00741815⟩

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