Variation in Coyote Age Determination from Annuli in Different Teeth

Roberts, Jerry D.

doi:10.2307/3800293

Cited by 15 publications

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“…It is concluded that GLGs in the dentine of upper canines are preferred for age determination in the Cape fur seal. This is mainly because their greater size results in wider spacing of GLGs, making them easier to interpret than other teeth (Laws 1953, Roberts 1978. However, the pulp cavity in Cape fur seals is totally occluded at around 13 yr of age, thereby preventing any further age estimation from dentinal GLGs.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of an Effective Method to Estimate Age of Cape Fur Seals Using Ground Tooth Sections

Oosthuizen

1997

Marine Mammal Science

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Teeth of known‐age Cape fur seals Arctocephalus pusillus pusillus were used to validate age estimated from ground sections. In the canines, dentine growth layer groups (GLGs) reflected age accurately but no reliable readings could be obtained from GLGs in the cementum. Upper canines were the most suitable for age estimation. By contrast, in the postcanines where the cementum is thicker, only GLGs in the cementum could be used for age determination, but not with the same accuracy as for dentine in the canines. Therefore, it is recommended that GLGs in the dentine be used to determine age in the Cape fur seal. However, pulp cavities in canines closed at about 13 yr and consequently GLGs in the cementum of the postcanines should be used where the pulp cavities of canines are closed. Accurate estimation of age is not possible from the dentine of older animals.

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Section: Discussionmentioning

confidence: 99%

Evaluation of an Effective Method to Estimate Age of Cape Fur Seals Using Ground Tooth Sections

Oosthuizen

1997

Marine Mammal Science

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“…In 1999, we extracted both canines from each jaw. For coyotes, the canine tooth produces the most distinct cementum annuli (Roberts , Bowen ).…”

Section: Methodsmentioning

confidence: 99%

Use of cementum annuli and eye-lens weight for aging coyotes

Scrivner¹,

Sego²

2014

Wildl. Soc. Bull.

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Age estimates are often needed to make good management decisions. We assessed the accuracy and precision of the cementum annuli analysis (CAA) technique for aging coyotes (Canis latrans). We also assessed the relationship between eye-lens weight and age. We sent 56 lower canines from 28 captive-born and captive-reared coyotes of known age to a laboratory to estimate age using CAA. The lab correctly determined age for 52 of 56 (93%) teeth and there was a strong correlation between mean estimated age using both canines from a coyote and known age. A strong correlation also existed between estimated age based on right and left teeth. Age predictions based on the left tooth agreed with the right tooth 25 of 28 (89%) occasions. Cementum annuli analysis was both accurate and precise for all age classes and we recommend its use whenever age-specific data are needed. Eye-lens weights discriminate effectively between subadults and adults, but predicted age of adults displays more variability than when estimated using CAA. Ó 2014 The Wildlife Society.

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“…Therefore, given that their permanent canines erupt at the age of 12-15 months (Smuts et al, 1978), the first cementum line forms 1 year after the change of dentition. In addition, Roberts (1978) reported that the change of dentition in the coyote is completed at 5-7 months of age and that the first cementum line is formed at c. 20 months of age. This suggests that, as with the African lion, the first line is formed 1 year after the change of dentition.…”

Section: Timing Of Formation Of the First Dark-stained Linementioning

confidence: 97%

“…Counting the cementum annuli of canine roots is considered the most accurate method of age estimation for most carnivorans (Dimmick & Pelton, 1996) and has been used for many species, including the bobcat Lynx rufus (Crowe, 1972), lion Panthera leo (Smuts, Anderson & Austin, 1978), wildcat Felis silvestris (Garc´ıa-Perea & Baquero, 1999), coyote Canis latrans (Nellis, Wetmore & Keith, 1972;Roberts, 1978) and grey wolf Canis lupus (Goodwin & Ballard, 1985;Landon et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Age determination of the Iriomote cat by using cementum annuli

et al. 2009

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We estimated the age of Iriomote cats Prionailurus bengalensis iriomotensis by using their canine cementum annuli. By studying the month of death and staining condition of the outermost layer, we determined that the dark-stained cementum lines of canines become apparent from February to September in males. By the time of deciduous tooth replacement and closure of the apical foramen, we estimated that the first prominent dark-stained line is formed during the second winter and third spring of the cat's life. Examination of known-age cats confirmed that the dark-stained lines represent annual rings. Therefore, assuming that Iriomote cats are born in April, their age can be estimated by adding one to the number of dark-stained lines. The month of death and number of dark-stained cementum lines must be considered for age determination. We also attempted to estimate the age of living Iriomote cats by examining the correlation between the level of wear and number of cementum annuli of the upper canines, and categorized the degree of tooth wear into seven classes. Teeth that exhibited more extensive wear (i.e. in a higher wear class) had more cementum annuli. We defined three age categories for living cats based on canine wear characteristics: 1 year (wear level I), 2-6 years (wear levels II-V) and 47 years (wear levels VI-VII). Therefore, canine wear is the most effective index for age estimation of living Iriomote cats.

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Variation in Coyote Age Determination from Annuli in Different Teeth

Cited by 15 publications

References 0 publications

Evaluation of an Effective Method to Estimate Age of Cape Fur Seals Using Ground Tooth Sections

Evaluation of an Effective Method to Estimate Age of Cape Fur Seals Using Ground Tooth Sections

Use of cementum annuli and eye-lens weight for aging coyotes

Age determination of the Iriomote cat by using cementum annuli

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