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Magnetoreception of mammals focused on domestic beasts of prey
Klemsová, Nikola ; Hart, Vlastimil (advisor) ; Svoboda, Jan (referee)
This work concerns to magneto-reception of mammals focused on domestic beasts of prey. A measurement was directed to three dogs and three cats with different races and places. At first they were observed in Klášterec nad Ohřís pound. This measurement seemed to be verifiable later, thats why the positional behaving (magnetic alignment) were observed in their inherent living conditions, especially in the garden or hutch.
Data was taken by photo-catch machine localized over their bowls, where there were observed their single orientation of body and head direction to water bowls. The account was also taken of daily temperature, sun position to that individual in direction of bowl to kennel, of measuring location and state of health.
During the measuring term 380 pictures has been evaluated. From these findings statistical preferred direction orientation during the drinking from water bowl were find out and also the preference of north-south line. The results of pictures also represents, that magnetic orientation does not depend on the animal species, as it was expected, bud on every individual.
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The influence of geomagnetism on the behavior of dogs
PLACHOVÁ, Denisa
The aim of this bachelor thesis was to evaluate the influence of geomagnetism on the dog. The theoretical part contains information from technical literature and articles concerning the ability of different species (from primitive organisms to large mammals) perceive the Earth's magnetic field and use it for their orientation and navigation. The practical part deals with own observation of the dog of the breed called pug, when was watched the spontaneous directional orientation of the dog during feeding, resting and excreting. Monitoring was carried out in a few months and the only tool, which was used was the compass, by which was recorded the direction in which the head of the dog was oriented during the individual activities. All measured values were entered into the tables created in Microsoft Excel spreadsheet and after that were statistically evaluated. From the evaluated data emerged that the dog during each of the monitored activity exhibited some directional preference. When feeding the dog preferred axis NW/SE, when resting S/SE direction and during excretion preferred axis NW/SE.
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Magnetic orientation in the bank vole (\kur{Myodes glareolus})
NOVÁKOVÁ, Monika
The magnetic orientation was established in several species of rodents, but the mechanism of its perception has not been determined. Aim of this work was to verify magnetic sense in the bank vole (Myodes glareolus) and try to solve the nature of its magnetoreception in tests carried out in total darkness and when the horizontal component was reversed and the vertical component was inverted. A spontaneous directional preference in the magnetic field was tested in circular arena.
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Function of retina of Homing pigeon \kur{Columba livia} in magnetoreception
BAJGAR, Adam
Many animals have ability to percieve the magnetic field of the Earth and use this clue for both orientation and navigation. Yet little is known about physiological mechanism that underlies this sensory ability. Although physiological mechanism still remains unclear, there are three major hypotheses how animals can detect the magnetic field. In this study I focused on the radical pair theory. I analyzed how manipulation of the ambient magnetic field influence the expression of CRY 1, CRY 2 and c-Fos in the pigeon´s retina. I observed in incerased numbers of CRY1, c-Fos and CRY1+c-Fos possitive cells in the ihned nuclear layer (INL) of the retina in animals sbjected to the periodical manipulation of the magnetic field inclination. These data demonstrate that the INL constains a population of neurons that are responsive to magnetic stimuli and strongly suggest that Cry 1 is involved in detection of the Earth magnetic field.
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