A tooth wear scoring scheme for age estimation of the Eurasian lynx ( Lynx lynx ) under field conditions

摘要: Within the framework of conservation actions for Eurasian lynx (Lynx lynx), ageing individuals is required to assess suitability translocation and investigate population dynamics disease epidemiology. We aimed develop a standardised tool free-ranging lynx, which would be non-invasive, time- cost-effective, applicable under field conditions. used tooth pictures 140 known age from Switzerland. Tooth colour, calculus, number incisor teeth canine, premolar molar wear were recorded according pre-defined criteria. Statistical comparisons among categories each criterion revealed significant differences all colour canine morphology showed obvious consistent alterations with age. Together shape, tips, amount they pictured age-related changes in dentition. Crown fractures, enamel flaking open pulp cavities observed an increasing prevalence over but also sporadically seen juveniles. Based on obtained results, we developed classification scheme distinguishing six classes: < 1 year, 1–2 years, 3–6 years, 7–9 years, 10–13 years, ≥ 14 years. The was subsequently tested same lynx. Classification success rates different readers ranged 69 88% errors did not exceed one class. homogenous replacement pattern < 1 year allowed us separate chart juveniles months. proposed promising objectively assign meaningful categories.