Reconstruction of individual life histories of rodents from their teeth and bone

Klevezal, G. A.

doi:10.1007/bf03192484

Cited by 11 publications

(11 citation statements)

References 18 publications

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“…In the present work, we have carried out a pilot/exploratory study approaching the age and season at death of a small random sample of the wildebeest from the Olduvai den through the analysis of the histology of teeth [ 28 ]. For this study, we have analysed the first molars from specimens of different age (age inferred from the analysis of the eruption and wear of molars, see above), from five adults and one juvenile ( Fig 2 ).…”

Section: Methodsmentioning

confidence: 99%

“…To conduct our study, we have analysed the cementum and dentine regions of the first molars that are considered the best recording structures in ungulates [ 28 ]. However, in our sample, two specimens lack the dental root (where the cementum is located) and the remaining four specimens show the cementum highly altered.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, we have focused our study on the structure of the dentin to infer the age and season at death. According to Klevezal ([ 28 ]; and citations therein), accentuated (dark) layers correspond to the growth layers formed annually coinciding with the unfavourable season (winter). By counting the number of dark layers within the dentin of the teeth we obtain the age-at-death for each specimen from this sample.…”

Section: Methodsmentioning

confidence: 99%

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Differential Predation by Age and Sex Classes in Blue Wildebeest in Serengeti: Study of a Modern Carnivore Den in Olduvai Gorge (Tanzania)

et al. 2015

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Age and sex selection of prey is an aspect of predator ecology which has been extensively studied in both temperate and African ecosystems. This dimension, along with fecundity, survival rates of prey and mortality factors other than predation are important in laying down the population dynamics of prey and have important implications in the management of species. A carnivore den located in the short-grassland ecological unit of the Serengeti was studied. Sex- and age- class (using five age categories) of the wildebeest remains recovered were analyzed through horn morphology, biometrics of the bones and tooth wear patterns. We compared our results with previous studies from lion and hyaena kills through multivariate analyses. Seasonality of the accumulation was analyzed through tooth histology. PCA and CVA results show that age class selection by predators depends on season, habitat-type, and growth rate of the wildebeest population. Female-biased predation was found to contradict classical hypotheses based on territorial male behaviour. The lion and spotted hyaena showed strong selection on age classes, contrary to previous studies. Migratory wildebeest sex ratio is regulated through differential predation by seasons and female deaths in the wet season are a trade-off for population stability. These data are crucial for an effective management of the species and the new method created may be useful for different carnivore species and their prey.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Differential Predation by Age and Sex Classes in Blue Wildebeest in Serengeti: Study of a Modern Carnivore Den in Olduvai Gorge (Tanzania)

et al. 2015

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“…This periodicity theoretically allows for estimation of age, even in days; incremental lines have been used to estimate day-age at death in some anthropological studies [1,4,5,9]. The ecological relevance of these increments has also been investigated, and has been used to reconstruct individual life histories [6,12,13,15]. Thus, a better understanding of tooth incremental lines may facilitate studies of wild animals where continuous observation is difficult.…”

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confidence: 99%

Dental Incremental Lines in Sika Deer (Cervus nippon); Polarized Light and Fluorescence Microscopy of Ground Sections

Iinuma

Tanaka

Kawasaki

et al. 2004

The Journal of Veterinary Medical Science

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ABSTRACT. Periodic growth incremental lines are found universally in dental hard tissues. This periodicity theoretically allows for estimation of age, even in days, which would be useful in studies of wild animals. In the present study, enamel and dentin increments of the sika deer (Cervus nippon) were observed in ground sections with a polarized light microscope, and their periodicity was examined by the use of a chronological labeling method with fluorochromes. Enamel increments occurred at a mean interval of 10.6 (SD=1.5) µm, and mean spacing of dentin increments was 17.3 (SD=1.8) µm. Fluorochromic marking revealed that incremental lines form each day in enamel and almost every second day in dentin. The fluorescence-labeled lines suggest that enamel formation of the first m olar is complete by the age of 5 months. Due to its longer interval of incremental lines and longer term of formation, we conclude that dentin is more suitable than enamel for day-age estimation in sika deer. Experimental confirmation of incremental growth periodicity in various species can improve the reliability of use of tooth increments for age estimation and life history reconstruction.

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“…These layers have been used most commonly to age carnivores by counting the annuli in incisors or canines (Linhart and Knowlton 1967;Allen 1974;Driscoll et al 1985;Catling et al 1991). Incisor layers have also been used to determine the age in some rodent species (Klevezal and Mina 1990;Trunova and Klevezal 1999;Klevezal 2002). However, age estimates are not as reliable because the incisors of rodents continuously grow and are worn down.…”

Section: Introductionmentioning

confidence: 99%

Age determination in yellow-pine chipmunks (Tamias amoenus): a comparison of eye lens masses and bone sections

Barker¹,

Boonstra²,

Schulte‐Hostedde³

2003

Can. J. Zool.

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Virtually all biological characteristics of organisms change with age, and thus, to assess the impact of these changes, accurate aging techniques are essential. However, many current methods are unable to accurately distinguish among adults of different ages. We determined the age of yellow-pine chipmunks (Tamias amoenus) from the Rocky Mountains of Alberta using eye lens masses, annuli from mandible sections, and annuli from femurs. Each of these methods was assessed against nine known-age animals and seven animals that had not been caught previously and were presumed to be juveniles. Eye lens masses could distinguish juveniles from adults but not adults of different ages. Mandibular sections were not practical in this species because of excessive tearing during sectioning. Femoral sections precisely predicted age. We found that the number of adhesion lines, minus one, accurately represented the ages of adults ranging from 1 to 5 years old. Femoral annuli have not previously been used to age mammals and our results suggest that they may be useful in aging other mammals, especially rodents.Peer reviewe

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Reconstruction of individual life histories of rodents from their teeth and bone

Cited by 11 publications

References 18 publications

Differential Predation by Age and Sex Classes in Blue Wildebeest in Serengeti: Study of a Modern Carnivore Den in Olduvai Gorge (Tanzania)

Differential Predation by Age and Sex Classes in Blue Wildebeest in Serengeti: Study of a Modern Carnivore Den in Olduvai Gorge (Tanzania)

Dental Incremental Lines in Sika Deer (Cervus nippon); Polarized Light and Fluorescence Microscopy of Ground Sections

Age determination in yellow-pine chipmunks (Tamias amoenus): a comparison of eye lens masses and bone sections

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