Hohn, Aleta A. (1980) A method for age determination of dolphins. University of Maryland Electron Microscope Central Facility Newsletter, 8, pp. 4-5.
The use of growth layers in teeth as an indicator of age in odnotocetes and pinnipeds was suggested by Laws (1954) and since then the method has been used extensively in both marine and non-marine mammals. Dentinal growth layers are groups (growth layer groups) of repetitive alternating bands which in cross-section are similar to growth rings in trees. The most commonly used methods for counting growth layer groups (GLGs) are by undecalcified longitudinal thin sections (150 um) or decalcified and stained thin sections (10-30 um). In longitudinal sections viewed with light microscopy, GLGs appear as opaque and translucent cones nestled one inside another, with the oldest dentine Iying adjacent to the enamel, and the newest layer borderinq the pulp cavity.
|Item Type: ||Article|
|Title: ||A method for age determination of dolphins.|
|Personal Creator/Author: |
|Hohn, Aleta A.||Aleta.Hohn@noaa.gov|
|Journal or Publication Title: ||University of Maryland Electron Microscope Central Facility Newsletter|
|Page Range: ||pp. 4-5|
|Issuing Agency: ||United States National Marine Fisheries Service|
|Item ID: ||2446|
|Depositing User: ||Patti M. Marraro|
|Date Deposited: ||15 Jul 2009 20:48|
|Last Modified: ||29 Sep 2011 21:03|
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