20.500.12556/RUL-188138 Vplivi telesne velikosti in dnevno-nočne aktivnosti prostoživečih živalskih vrst na verjetnost njihovega zaznavanja s fotopastmi Impacts of body size and circadian activity of wildlife species on the probability of their detection with camera traps V raziskavi smo proučili vpliv telesne velikosti in dnevno-nočne aktivnosti prostoživečih živalskih vrst na verjetnost njihove zaznave s fotopastmi z namenom izboljšanja zanesljivosti ocen gostote populacij. Terensko delo je med februarjem 2023 in marcem 2024 potekalo na območju Menišije, kjer smo na 97 raziskovalnih ploskvah namestili 50 avtomatskih kamer. Skupno smo zbrali skoraj 250.000 posnetkov. Živali smo glede na plečno višino razvrstili v tri velikostne razrede: majhne (<50 cm), srednje (50–100 cm) in velike (>100 cm) ter analizirali njihovo oddaljenost od kamere in zaznavnost glede na čas dneva. Za statistično obdelavo smo uporabili neparametrične teste in linearne modele v programu R ter primerjali agregirane in neagregirane podatke. Ugotovili smo, da telesna velikost pomembno vpliva na zaznavnost; velike živali so bile zaznane na večjih razdaljah kot srednje in majhne vrste. Dnevno-nočne razlike v zaznavnosti so bile manj izrazite kot vpliv telesne velikosti, kar kaže, da cirkadiani ritem vpliva predvsem posredno, prek vedenjskih in prostorskih dejavnikov. Iz rezultatov izhaja, da je za zanesljive ocene gostot potrebna korekcija zaznavnosti glede na velikost in vedenjske značilnosti vrst. Raziskava prispeva k izboljšanju metod fotomonitoringa ter razumevanju bioloških ter tehničnih omejitev pri ocenjevanju populacijskih parametrov prostoživečih vrst. In this study, we examined the influence of body size and circadian activity of wildlife species on their detection probability using camera traps, with the aim of improving the reliability of population density estimates. Fieldwork was conducted in the Menišija area between February 2023 and March 2024, where 97 research plots were established. In total, nearly 250,000 images were collected. Animals were classified into three body size categories based on shoulder height: small (<50 cm), medium (50–100 cm), and large (>100 cm), and we analyzed their distance from the camera and detection relative to time of day. We conducted statistical analyses using non-parametric tests and linear models in R, including comparisons of aggregated and non-aggregated data. Results showed that body size significantly affects detectability; large animals were detected at greater distances than medium and small animals. Differences between day and night detections were less pronounced than the effect of body size, indicating that the circadian rhythm primarily influences detectability indirectly through behavioral and spatial factors. The findings highlight the need to correct detectability based on body size and behavioral traits to obtain more reliable density estimates. This study contributes to improving camera-trapping methodologies and understanding biological and technical limitations in assessing population parameters of wildlife species. telesna velikost prostoživeče živali cirkadiana aktivnost zaznava fotopasti body size wildlife species circadian activity detection camera traps true false false [I. Štiglic] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-09-19 07:16:27 2026-09-19 07:16:38 2026-09-24 12:09:48 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 59.081.14:[59.018+591.5] 290046 292360707 60669.pdf 60669.pdf 1 34715E3A1F451601BBF5D14829625678 5fdeb54c2c1143e0ec042b0970fadd1027acc8225d0b75715417dc9d7e9a8094 3f9fc6bf-b3e9-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=248166 Biotehniška fakulteta 0 0 0