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Interaction of lichens and invertebrates with emphasis on mites
Vtípilová, Věra ; Steinová, Jana (advisor) ; Černajová, Ivana (referee)
Lichens interact with many groups of invertebrates. Acari (mites), Gastropoda (gastropods), Rotifera (rotifers), Nematoda (nematodes), Tardigrada (tardigrades), Protozoa (protists), Collembola (springtails) and Insecta (insects), especially Psocoptera (book and bark lice), Lepidoptera (butterflies and moths) and Coleoptera (beetles) represent the most common groups. These animals use lichens as a shelter and food. Lichens have different defence mechanisms, for example, secondary metabolites. On the other hand, invertebrates often mediate the dispersal of lichens. Some lichens can grow on shells or a body surface of living invertebrates. In my thesis, I describe individual groups of invertebrates that interact with lichens, and I mention specific examples of these interactions. A special emphasis is given on mites because they are one of the most important consumers of lichens, and I will pay attention to them in my diploma thesis.
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Interactions "symbiotic" or "parasitic" bacteria Cardinium and Wolbachia with mites (Acari)
Hejdánková, Sylvie ; Hubert, Jan (advisor) ; Smrž, Jaroslav (referee)
The thesis reviews known information and findings describing the interactions of bacteria Candidatus Cardinium hertigii (Sphingobacteriales: Flexibacteraceae) and Wolbachia pipientis (Rickettsiales: Rickettsiaceae) with mites (Acari). Both bacteria are known as symbionts or reproductive parasites and has been found in many species of arthropods. Here, the morphological characterization and localization of bacteria in their hosts and ecological interactions are revised and described. The main known interactions between these bacteria and mites lead to cytopasmic incompatibility, parthenogenesis, feminization and hybrid breakdown. The mites can be infected by both bacteria (Cardinium and Wolbachia), i. e. double infections, or by several strains of bacteria, i. e. multiple infections. The possible aplication of symbiotic/parasitic bacteria in the control of pest mites is discussed. The studied bacteria are suitable models for desription of the arthropod bacterial interactions.
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