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A Novel Objective Method of Estimating the Age of Mandibles from African Elephants (Loxodonta africana Africana).

Stansfield FJ - PLoS ONE (2015)

Bottom Line: The importance of assigning an accurate estimate of age and sex to elephant carcasses found in the wild has increased in recent years with the escalation in levels of poaching throughout Africa.These 'Age Reference Lines' were then associated with an age scale based on previous studies and Zimbabwean mandibles of known age.The new ranking produced a single age scale that proved useful for both male and female mandibles up to the maximum lifespan age of 70-75 years.

View Article: PubMed Central - PubMed

Affiliation: The Elephant Research and Conservation Unit, Savé Valley Conservancy, Chiredzi, Zimbabwe.

ABSTRACT
The importance of assigning an accurate estimate of age and sex to elephant carcasses found in the wild has increased in recent years with the escalation in levels of poaching throughout Africa. Irregularities identified in current ageing techniques prompted the development of a new method to describe molar progression throughout life. Elephant mandibles (n = 323) were studied and a point near the distal dental alveolus was identified as being most useful in ranking each jaw according to molar progression. These 'Age Reference Lines' were then associated with an age scale based on previous studies and Zimbabwean mandibles of known age. The new ranking produced a single age scale that proved useful for both male and female mandibles up to the maximum lifespan age of 70-75 years. Methods to aid in molar identification and the sexing of found jaws were also identified.

No MeSH data available.


Related in: MedlinePlus

A comparison of the typical development (not necessarily occlusal wear) of molar teeth of African elephants at different lamellae numbers according to the position of the Age Reference Line.Molars are aligned with mesial end to the left with the smaller molar at the top, progressively getting larger downward. Red dots indicate the lamellae number (L), which is 10 cm mesial from the Age Reference Point (See Fig 2). E) M4, M5 and M6 at L6. F) M4, M5 and M6 at L7. G) M4, M5 and M6 at L8. H) M4, M5 and M6 at L9.
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pone.0124980.g010: A comparison of the typical development (not necessarily occlusal wear) of molar teeth of African elephants at different lamellae numbers according to the position of the Age Reference Line.Molars are aligned with mesial end to the left with the smaller molar at the top, progressively getting larger downward. Red dots indicate the lamellae number (L), which is 10 cm mesial from the Age Reference Point (See Fig 2). E) M4, M5 and M6 at L6. F) M4, M5 and M6 at L7. G) M4, M5 and M6 at L8. H) M4, M5 and M6 at L9.

Mentions: The white arrow/red dot marks the Age Reference Point (ARP) and the yellow line marks the Age Reference Line (ARL). The remnant of the tooth in the right mandible had rotated as shown. Grid = 1cm2.


A Novel Objective Method of Estimating the Age of Mandibles from African Elephants (Loxodonta africana Africana).

Stansfield FJ - PLoS ONE (2015)

A comparison of the typical development (not necessarily occlusal wear) of molar teeth of African elephants at different lamellae numbers according to the position of the Age Reference Line.Molars are aligned with mesial end to the left with the smaller molar at the top, progressively getting larger downward. Red dots indicate the lamellae number (L), which is 10 cm mesial from the Age Reference Point (See Fig 2). E) M4, M5 and M6 at L6. F) M4, M5 and M6 at L7. G) M4, M5 and M6 at L8. H) M4, M5 and M6 at L9.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4430523&req=5

pone.0124980.g010: A comparison of the typical development (not necessarily occlusal wear) of molar teeth of African elephants at different lamellae numbers according to the position of the Age Reference Line.Molars are aligned with mesial end to the left with the smaller molar at the top, progressively getting larger downward. Red dots indicate the lamellae number (L), which is 10 cm mesial from the Age Reference Point (See Fig 2). E) M4, M5 and M6 at L6. F) M4, M5 and M6 at L7. G) M4, M5 and M6 at L8. H) M4, M5 and M6 at L9.
Mentions: The white arrow/red dot marks the Age Reference Point (ARP) and the yellow line marks the Age Reference Line (ARL). The remnant of the tooth in the right mandible had rotated as shown. Grid = 1cm2.

Bottom Line: The importance of assigning an accurate estimate of age and sex to elephant carcasses found in the wild has increased in recent years with the escalation in levels of poaching throughout Africa.These 'Age Reference Lines' were then associated with an age scale based on previous studies and Zimbabwean mandibles of known age.The new ranking produced a single age scale that proved useful for both male and female mandibles up to the maximum lifespan age of 70-75 years.

View Article: PubMed Central - PubMed

Affiliation: The Elephant Research and Conservation Unit, Savé Valley Conservancy, Chiredzi, Zimbabwe.

ABSTRACT
The importance of assigning an accurate estimate of age and sex to elephant carcasses found in the wild has increased in recent years with the escalation in levels of poaching throughout Africa. Irregularities identified in current ageing techniques prompted the development of a new method to describe molar progression throughout life. Elephant mandibles (n = 323) were studied and a point near the distal dental alveolus was identified as being most useful in ranking each jaw according to molar progression. These 'Age Reference Lines' were then associated with an age scale based on previous studies and Zimbabwean mandibles of known age. The new ranking produced a single age scale that proved useful for both male and female mandibles up to the maximum lifespan age of 70-75 years. Methods to aid in molar identification and the sexing of found jaws were also identified.

No MeSH data available.


Related in: MedlinePlus