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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Hibernation of anuran larvae: occurrence, causes and consequences
 NOWAK, Rudolf
The bachelor thesis deals with hibernation of amphibians and describes its process in each larval phase. The thesis furthermore describes factors on which hibernation depends and the reasons, which cause it. The main factors for hibernation of animals are temperature and lack of food. Animals have to slow down their metabolism and they survive thanks to their energy reserves. When temperature drops below zero, amphibians protect themselves from freezing with concentration cryogenic compounds, water crystallization in extracellular spaces and preservation liquid cytoplasm inside cells. Hibernation of tadpoles depends on season length, which decreases with increasing altitude and longitude together with decreasing temperature. It is partially caused by thyroid hormones, which controls metamorphosis, because thyroid slows down its function with decreasing temperature. Another stimulation for hibernation of tadpoles is food shortage tadpoles cannot properly grow and develop without food. Dormancy of tadpoles is classified as obligatory and facultative. Metamorphosis after hibernation produces lower risk of mortality during winter and ensures bigger size of a specimen in the following year.
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