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Age Estimation of African Lions Panthera leo by Ratio of Tooth Areas.

White PA, Ikanda D, Ferrante L, Chardonnet P, Mesochina P, Cameriere R - PLoS ONE (2016)

Bottom Line: Improved age estimation of African lions Panthera leo is needed to address a number of pressing conservation issues.Derived from measurements taken from lions aged 3-13 years for which exact ages were known, the formula explains 92% of the total variance.The method of calculating the pulp/tooth area ratio, which has been used extensively in forensic science, is novel in the study of lion aging.

View Article: PubMed Central - PubMed

Affiliation: Center for Tropical Research, Institute of the Environment and Sustainability, University of California, Los Angeles, California, United States of America.

ABSTRACT
Improved age estimation of African lions Panthera leo is needed to address a number of pressing conservation issues. Here we present a formula for estimating lion age to within six months of known age based on measuring the extent of pulp closure from X-rays, or Ratio Of tooth AReas (ROAR). Derived from measurements taken from lions aged 3-13 years for which exact ages were known, the formula explains 92% of the total variance. The method of calculating the pulp/tooth area ratio, which has been used extensively in forensic science, is novel in the study of lion aging. As a quantifiable measure, ROAR offers improved lion age estimates for population modeling and investigations of age-related mortality, and may assist national and international wildlife authorities in judging compliance with regulatory measures involving age.

No MeSH data available.


Related in: MedlinePlus

Peri-apical X-ray of African Lion PM2.X-ray showing outline of total tooth and pulp areas for calculating area ratio using Adobe Photoshop after Cameriere et al. (2011) [33]. Full details of the outlining and area measuring method are provided in S1 Text.
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pone.0153648.g001: Peri-apical X-ray of African Lion PM2.X-ray showing outline of total tooth and pulp areas for calculating area ratio using Adobe Photoshop after Cameriere et al. (2011) [33]. Full details of the outlining and area measuring method are provided in S1 Text.

Mentions: An intra-class correlation coefficient (ICC) of 0.962 and its non-parametric bootstrapped 95% confidence interval (95% CI: 0.902–0.988) indicated an acceptable level of intra-observer agreement between paired sets of measurements carried out on re-examined X-rays (Fig 1).


Age Estimation of African Lions Panthera leo by Ratio of Tooth Areas.

White PA, Ikanda D, Ferrante L, Chardonnet P, Mesochina P, Cameriere R - PLoS ONE (2016)

Peri-apical X-ray of African Lion PM2.X-ray showing outline of total tooth and pulp areas for calculating area ratio using Adobe Photoshop after Cameriere et al. (2011) [33]. Full details of the outlining and area measuring method are provided in S1 Text.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835051&req=5

pone.0153648.g001: Peri-apical X-ray of African Lion PM2.X-ray showing outline of total tooth and pulp areas for calculating area ratio using Adobe Photoshop after Cameriere et al. (2011) [33]. Full details of the outlining and area measuring method are provided in S1 Text.
Mentions: An intra-class correlation coefficient (ICC) of 0.962 and its non-parametric bootstrapped 95% confidence interval (95% CI: 0.902–0.988) indicated an acceptable level of intra-observer agreement between paired sets of measurements carried out on re-examined X-rays (Fig 1).

Bottom Line: Improved age estimation of African lions Panthera leo is needed to address a number of pressing conservation issues.Derived from measurements taken from lions aged 3-13 years for which exact ages were known, the formula explains 92% of the total variance.The method of calculating the pulp/tooth area ratio, which has been used extensively in forensic science, is novel in the study of lion aging.

View Article: PubMed Central - PubMed

Affiliation: Center for Tropical Research, Institute of the Environment and Sustainability, University of California, Los Angeles, California, United States of America.

ABSTRACT
Improved age estimation of African lions Panthera leo is needed to address a number of pressing conservation issues. Here we present a formula for estimating lion age to within six months of known age based on measuring the extent of pulp closure from X-rays, or Ratio Of tooth AReas (ROAR). Derived from measurements taken from lions aged 3-13 years for which exact ages were known, the formula explains 92% of the total variance. The method of calculating the pulp/tooth area ratio, which has been used extensively in forensic science, is novel in the study of lion aging. As a quantifiable measure, ROAR offers improved lion age estimates for population modeling and investigations of age-related mortality, and may assist national and international wildlife authorities in judging compliance with regulatory measures involving age.

No MeSH data available.


Related in: MedlinePlus