Šio tiriamojo darbo tikslas buvo įvertinti Radviliškio girininkijoje aptiktas upinio bebro (Castor fiber) populiacijas. Tyrimas atliktas 2012 - 2013 metais. Pirmiausia tyrimo metu buvo renkama informacija apie Radviliškio girininkijoje, Linkaičių miško teritorijoje, esančiuose melioracijos grioviuose, įsikūrusias bebravietes, jų gausumą. Taip pat tyrimo eigoje nustatytas bebrų skaičius kiekvienoje aptiktoje bebravietėje. Nustatyta bebrų gyvenamoji aplinka, mitybos įpročiai bei jų padaroma žala miškui. / The aim of this research was to evaluate the detected Eurasian beaver (Castor fiber) population in Radviliškis forestry. The study was accomplished in the year of 2012 - 2013. In the beginning of the study was collected information about the beaver lodges at drainage ditches in Linkaičiai forest teritory, Raviliškis forestry. Also during the investigation was detecded number of the beavers in each beaver lodge.

The thesis deals with the preparation, creation and evaluation of an informatics competition for pupils of primary and secondary schools, called Informatics Beaver. The work also includes a summary of simile existing contests on informatics. Furthermore, it seeks to convey and clarify the technical and organizational problems associated with the preparation and conduct of the competition.

Because it is a fundamental skill to develop in education, computational thinking (CT) has become a growing field in education. The ability to solve algorithmic problems and reuse solutions from one concept to another is the definition of CT(J.Shute et al. p.142).  In this study, the goal was to investigate the CT knowledge between countries such as Sweden and South Africa. With both countries adopting different ways of teaching CT to their students. Sweden uses the method of implementing programming through the STEM(science, technology, engineering and mathematics) subjects. While South Africa uses a separate subject called Coding and Robotics to teach their students. Using the Computational thinking test(CTt) and Bebras task as the method of choice to conduct the study on 22 students from Sweden and South Africa. By comparing the results from the students there were conclusions that could be drawn on how the differences in teaching had an impact on their gained CT knowledge. As well as if there were different concepts within the CTt where either country excelled over the other. The tests were conducted online and for the students from South Africa it was also conducted at home during their holiday break and it was concluded that there were no differences between the two countries since there was not enough evidence to support  a median other than 0 at the ∝ = 0.05 significance level. The results indicate that the difference in how CT is implemented in school made no difference for the results as well as the experience in block based and text based programming.

Šio darbo tikslas buvo ištirti atsitiktinai padaugintos polimorfinės DNR (APPD) metodu skirtingas Europinio bebro (Castor fiber) subpopuliacijas Lietuvoje. Buvo ištirtos Europinio bebro 4 subpopuliacijose: Mituvos, Vilkaraisčio, Giedraičių ir Rusnės salos. DNR atsitiktinai padaugintų fragmentų polimorfizmas buvo tirtas naudojant 10 pradmenų. Pagal Nei apskaičuotą genetinę distanciją tarp populiacijų, labiausiai genetiškai panašios buvo Giedraičių ir Vilkraisčio subpopuliacijos (0,936), didžiausia genetinė distancija nustatyta tarp Rusnės salos ir Vilkaraisčio subpopuliacijų (0,288). Ištirtos subpopuliacijos grupuojasi į du klasterius: vieną klasterį sudaro Rusnės salos ir Mituvos subpopuliacijos, kitą – Vilkaraisčio ir Giedraičių subpopuliacijos. Europinio bebro subpopuliacijų genetinei įvairovei nustatyti, Popgene programa buvo apskaičiuoti 4 parametrai. Shannon informacinis indeksas svyravo nuo 0,2527 (Rusnės sala) iki 0,3895 (Giedraičiai). Nei genetinė įvairovė svyravo nuo 0,1677 (Rusnės sala) iki 0,2589 (Mituva). Didžiausias nustatytas alelių skaičius buvo Mituvoje (1,8911), mažiausias Rusnės saloje (1,5050). Efektyvus alelių skaičius svyravo nuo 1,2864 (Rusnės sala) iki 1,444 (Giedraičiai). Didžiausia genetinė įvairovė buvo aptikta Mituvos subpopuliacijoje, o mažiausia genetine įvairove pasižymi Rusnės salos subpopuliacija. Daugiausia polimorfinių lokusų buvo aptikta Mituvos subpopuliacijoje (89,11%), o mažiausiai Rusnės salos subpopuliacijoje (50,5%). Nustatėmė, kad... [toliau žr. visą tekstą] / The aim of this study is to evaluate genetic structure of European beavers (Castor fiber) subpopulations from Lithuania using RAPD (Random Amplified Polymorphic DNA) method. We investigated genetic variability of 4 subpopulations from Rusne, Mituva, Giedraiciai and Vilkaraistis. 10 primers were used in this analysis. Acording to Nei‘s genetic identity, the most similar were subpopulations from Giedraiciai and Vilkaraistis (0,936), the highest genetic distance was observed between subpopulations from Rusnes island and Vilkaraistis (0,288). These subpopulations form two clusters: Mituva and Rusnes island forms one cluster and Vilkaraistis and Giedraiciai – another. To evaluate the genetic variation in subpopulations we analysed four parameters. Shannon’s informations index was from 0,2527 in Rusnes island to 0,3895 in Giedraiciai.The highest Nei‘s genetic variaty was observed in subpopulation from Mituva and the smallest in Rusnes island (0,1677).The highest number of alleles was detected in Mituva (1,8911) and the smalest in Rusnes island (1,5050). The efective number of alleles was from 1,2864 in Rusnes island to 1,444 in Giedraiciai. From these parametres we can see that the most genetic diversity is observed in subpopulation from Mituva and the smallest in subpopulation from Rusnes island. We detected that the in Rusnes island 50,5 % of loci were polimorphic, and in subpopulation from Mituva even 89,11% of loci were polimorphic. We found out that molecular diversity is... [to full text]