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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Plasticity of circadian rhythms of the common bed bug
 Čejková, Lada ; Balvín, Ondřej (advisor) ; Doležel, David (referee)
Circadian rhythms can be found in all organisms from prokaryotes through plants to animals. They are very plastic, able to adapt to the climatic conditions of the environment and the current availability of food, such differences in conditions led to origin of intraspecific polymorphisms of circadian rhythms. This bachelor thesis summarizes the known data on the circadian rhythm plasticity, managing mechanisms of circadian rhythms and their interdependence. Circadian rhythms were studied only sporadically in the human ectoparasite a bed bug (Cimex lectularius), rhythm reversal can be achieved just by changing the illumination. With knowledge about plasticity of circadian rhythms it shall be possible to identify the changes in the managing mechanisms of circadian rhythms in the bed bug. Key words: circadian rhythms, bed bug, plasticity of circadian rhythm, polymorphism of circadian rhythms
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Differentiation of semiochemicals among lineages of the bed bug (Cimex lectularius)
 Pilařová, Kateřina ; Balvín, Ondřej (advisor) ; Kateřina, Kateřina (referee)
Lineages of the common bedbug Cimex lectularius associated with bats and humans separated from each other tens or hundreds of thousands years ago. Currently, they are genetically isolated and some degree of postcopulatory reproduction barrier has been shown. This thesis aims to test the possible mechanisms of precopulatory isolation. Possible differences of semiochemicals between the host lineages were examined by experiments in arenas (four shelters, two unconditioned, one conditioned by scent of specific lineage and one by scent of non-specific lineage, put together in one arena, to which one bedbug male was introduced every time). For the experiment, six breeds (three from bat lineage and three from human lineage) which originated from different parts of Czech Republic were used.
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