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Behaviour and electric signalling of Gnathonemus petersii in basic neurobehavioural tests
Juhaňáková, Kateřina ; Horká, Petra (advisor) ; Frouzová, Jaroslava (referee)
Neuroscience research on psychiatric disorders uses a wide range of animal species as model organisms. Most notably rodents and zebrafish Danio rerio. However, the behavioral repertoire of current model species does not allow for the simulation of verbal and some specific cognitive symptoms that are present in many disorders such as schizophrenia or autism. The elephant nose fish Gnathonemus petersii is a weakly electric fish that uses electrical signaling for spatial orientation (electrolocalization) and communication (electrocommunication). Therefore, the experimental advantage of measuring individual differences in electrical signaling for electrocommunication and electrolocalization may provide deeper insight into human psychiatric disorders associated with cognitive and verbal disorders and expand the possibilities for animal modeling in general. The aim of this thesis was to describe behavioral characteristics in basic neurobehavioral tests such as the open field test, novel object type tests as well as in relation to their electroactivity. The results of the open field test are in agreement with previous studies conducted on rodents and zebrafish. The novel object tests were not so clear-cut. Behaviour was tested in relation to the size of the individuals and a positive relationship was found in the...
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Orientation of helminths during host seeking
Vojtová, Terezie ; Mikeš, Libor (advisor) ; Horák, Petr (referee)
The parasitic helminths are often forced in the environment to search for their host quickly in order to continue the ontogenetic development, or else to finish it. To search for and indentify the host, they use various types of receptors which allow them to provoke a taxes corresponding to the oncoming stimulus and to react regarding the current situation. In respect to the concept relevant to the helminths, this work concerns trematodes, whose freely movable stadia are miracidium and cercacia, and then monogeneans which are viparous or oviparous with oncomiracidium larva, and nematodes during which the third larva stage moves. The representatives of the groups of Myxozoans and Ciliophorea are also mentionned, since they use similar mechanisms to look for hosts as helminths. This thesis includes the summary of the existing knowledge related to the orientation of helminths in the environment. On the basis of the data that is already known, it is possible to compare which mechanisms are used for host-seeking by particular species, and according to which signals from the surroundings they most often orientate themselves. Powered by TCPDF (www.tcpdf.org)
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Orientation of helminths during host seeking
Vojtová, Terezie ; Mikeš, Libor (advisor) ; Horák, Petr (referee)
Helminths are often forced in the environment to search for their host quickly in order to continue the ontogenetic development, or else to finish it. To search for and indentify the host, they use various types of receptors which allow them to provoke a taxes corresponding to the oncoming stimulus and to react to the presence of the host. This thesis includes the summary of the existing knowledge related to the orientation of helminths, the comparison of the mechanisms used by the searching of a host and signals in the environment. In respect to the concept relevant to the helminths, this work concerns trematodes, whose freely movable stadia are miracidium and cercaria, and then monogeneans which are viparous or oviparous with oncomiracidium larva, and nematodes with the third infective larva stage. The representatives of fish parasites of Myxozoans and Ciliophorea are also mentionned, since they use similar mechanisms to look for hosts as helminths. Powered by TCPDF (www.tcpdf.org)
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