Relationship between bears reproductive success and the cementum annulus width of teeth (IMAGE)

Tokyo University of Agriculture and Technology

Relationship between bears reproductive success and the cementum annulus width of teeth

Caption

The white and black arrows in photomicrographs of cementum annulus mean the annulus width formed in years when female bears succeed to lactate and years when females do not succeed, respectively. The numbers above arrows indicated the ages when cementum annulus created. The cementum annulus width became narrower in years of lactation because mothers use their energies to raise cubs and nutritional conditions of mothers become worse.

Credit

Kahoko Tochigi

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