PERRIN ET AL.: GROWTH AND REPRODUCTION OF THE EASTERN SPINNER DOLPHIN 



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GROWTH LAYERS (no.) 



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FEMALES 



AVERAGE LENGTH AT BIRTH 



GROWTH LAYERS (no) 



FIGURE 16.— Scatterplot of body length on number of postnatal dentinal growth layers in 183 male ia> and 250 female (b) eastern 

 spinner dolphins. Circled dots are means for 0-1 layer, 1-2 layers, for 2-layer increments thereafter until 12 layers in males and 16 in 

 females and for ^12 layers and a 16 layers, respectively. The line is a two-cycle Laird fit to single-layer incremental means ( see text i. 



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