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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Evolution of parasitic Hymenoptera hosts specialisation of the genus Torymus
 Bubeníková, Kristýna ; Janšta, Petr (advisor) ; Bogusch, Petr (referee)
The genus Torymus (Chalcidoidea: Torymidae) has very diversified parasitic strategies and adaptations to its hosts. Its larvae are ectoparasitoids and attack mostly larvae of various gall wasps (Hymenoptera: Cynipidae) and gall midges (Diptera: Cecidomyiidae). However, few species prefer also other insect groups as a host or are even phytophagous. Many hypotheses concerning evolution of insect host associations were published, but have not been satisfactorily tested using parasitic insects as a model. In this thesis I studied coevolution of the genus Torymus and its hosts. The main questions are what kind of host shifts occurred during the evolution of host strategies and whether sister species of parasitoids are specific to the related hosts/or nonrelated hosts living in the same type of habitat. I also studied changes at morphological adaptations to its hosts. To test critically these hypotheses, I constructed phylogenetic tree of selected Torymus species based on 5 genes and compared their host association within and between clades of Torymus. Key words: Torymus, Chalcidoide, parasitoid, phylogeny, host specialisation
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Parasitoid hymenoptera hosts specialisation and defensive mechanisms of their host species
 Bubeníková, Kristýna ; Janšta, Petr (advisor) ; Holý, Kamil (referee)
Parasitoids (Hymonoptera: "Parasitica") are very large group of insects. Their diversity is also enormous in various morphological adaptations and hosts specialisations. The bachelor thesis summarize particular types of host specialisations and compare generalits and specialists from taxonomical, ecological, evolutionary and geographical point of view. The thesis include summary of theories concerning host-defence adaptations against parasitoids (i.e. morphological adaptations, space-time adaptations) as well. Key words: Apocrita, specialist, generalist, defensive mechanism, evolutuion
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1 Bubeníková, Kateřina
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