Honeybee parasites and their influence on the gut microbiome.

Given the great ecological and economic importance of the honeybee, the health of honeybee colonies is under intense research. The scientific community is desperately trying to understand the heavy losses in the honeybee population, which we are currently facing. The reduction in their population could be caused by insecticides, weather, diet composition, disruption gut microbiome, some bacteria, viruses, and parasites. A lot of information is known about individual stress factors, less so about the interaction between them. This work is therefore focused on summarising information about a few chosen honeybee parasites with consideration for their effect on the microbiome of the digestive tract. There were chosen six of the most important and commonly discussed species of parasites: Nosema apis and Nosema ceranae, Crithidia mellificae and Lotmaria passim, Varroa destructor, and Acarapis woodi. The first chapter is dedicated to the honeybee, its taxonomy, anatomy, life in the colony, and defense against pathogens. The second chapter discusses more details of the intestinal microbiome of bees, its composition, function, and disturbance. The following sections focus on individual bee parasites and their effect on the host's intestinal microbiome