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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
The possibilities of determining the geographic origin of plant and animal products by means of stable isotopes of oxygen, hydrogen and carbon. Isotope signature in keratin of tortoise´s shell
 DRTINOVÁ, Martina
This biological study is focused on the possibility of using stable isotope analyses to determine the geographic origin of plants and mainly animals especially tortoises. In the experiment nineteen tortoises were divided into two groups which were fed by isotopically different food and water for one year. The samples of keratin from their shells were collected before and after the experiment. Then the samples were analysed for the ratio of particular isotopes using isotope ratio mass spectrometry.
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Male´s reproductive strategies of the European tree frog (\kur{Hyla arborea}) in relation to body size
 DRTINOVÁ, Martina
This biological study is focused on the reproductive behaviour of the European tree frog Hyla arborea. I examined the relationhips between the body size of individual males and other characteristics of reproduction, e.g. time of arrival, departure, chorus tenure, lenght of presence in the breeding locality, or number of recaptures. Males were caught, measured and recaptured and measured again all the reproduction period.
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