Abstract
RECENT detailed investigations of the life-histories of several arctic and antarctic phocids1–3 have established the use of incremental layers in the dentine and cementum of canine teeth as accurate indicators of age. Such studies have relied on seasonal differences in the rate and type of deposition for determining the annual nature of the layers, but so far as we are aware, the results obtained have never been validated by examination of teeth from an animal of known age.
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References
Fisher, H. D., Fish. Res. Board Canada, MS. Rep. Series (Biological), 588 (1954).
Laws, R. M., Falkland Inlands Dependencies Sci. Rep., 8 (1953).
McLaren, I. A., Fish. Res. Board Canada, Bull. 118 (1958).
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MANSFIELD, A., FISHER, H. Age Determination in the Harbour Seal, Phoca vitulina L.. Nature 186, 92–93 (1960). https://doi.org/10.1038/186092a0
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DOI: https://doi.org/10.1038/186092a0
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