Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/3733
Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: African elephant age determination from teeth: validation from known individuals
Authors: Lee, Phyllis C
Sayialel, Soila
Lindsay, Keith
Moss, Cynthia J
Contact Email: phyllis.lee@stir.ac.uk
Keywords: elephant age determination
elephant survivorship
jaw sex determination
tooth progression
Issue Date: Apr-2012
Publisher: Wiley-Blackwell
Citation: Lee PC, Sayialel S, Lindsay K & Moss CJ (2012) African elephant age determination from teeth: validation from known individuals, African Journal of Ecology, 50 (1), pp. 9-20.
Abstract: We assess tooth-based age criteria for African elephants developed by Laws in relation to known-aged individuals in the Amboseli elephant population. Laws's technique remains a robust and useful mechanism for age determination, although we suggest revisions to the oldest age categories. Blind age assignment to jaws of unknown sex using the Laws criteria resulted in misclassification of M4 and M5; measures overlapped too much to differentiate these teeth by sex. Sexes could be reliably distinguished after age 30 or XIX in tooth category by two measures: mandible thickness and width of the ascending ramus, but individuals of the same known age differed in tooth wear and progression rates. Such variation needs to be incorporated in the error assigned to tooth age categories. Ages at death of found jaws (n = 266) were similar to results of survival analysis from all demographic data (n = 2455), excluding calves whose jaws decompose because of weathering and scavengers. Jaw-based models of age at death need correction for the inability to detect this early mortality, which artificially extends mean longevity by up to 6 years.
Type: Journal Article
URI: http://hdl.handle.net/1893/3733
DOI Link: http://dx.doi.org/10.1111/j.1365-2028.2011.01286.x
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author; you can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Psychology
Amboseli Trust for Elephants
Amboseli Trust for Elephants
Amboseli Trust for Elephants

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