The aim of this master's thesis was to fill the knowledge gap about the vocalizations of Eurasian lynx (Lynx lynx) in the wild. The data obtained will contribute to a better understanding of the ecology of the Eurasian lynx and to the protection of this species. In the Kočevsko area, on February 4, 2022, we placed a telemetry collar with a GPS and an audio-recording device (audio-logger) on a male lynx. This is the first lynx ever to be fitted with an audio-recording device. We also obtained audio recordings with AudioMoth recorders, from videos recorded with automatic cameras, and through opportunistically collected reports of lynx vocalization. All audio recordings were reviewed using the program Audacity, and data were analyzed using the programs R studio, QGIS, and Excel. We focused on calls that lynx use to communicate over long distances. With audio-logger we recorded a total of 1449 call series and calculated the average length of the call series (19.55 s), the average number of individual calls in the series (9.51), the time interval between calls (1.49 s), and analyzed factors that might influence the frequency of calls. The lynx called most frequently at dusk and at night. Compared to locations where it did not call, it called more frequently on ridges and on slopes with medium and low gradients, and it avoided calling near settlements. He called more frequently when near the female with whom he shared the territory, but then stopped calling on mating days. As for the presence of prey, he called most often when he had prey but was not right next to it. Weather conditions also had an influence with decreased calling frequency in windy weather and during percipitation. We estimated that a male lynx makes around 3,000 series and 28,000 calls per year. With our work, we raised many questions for further research, and we were the first to demonstrate the effectiveness of using recording devices on telemetry collars to study solitary cat species.
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