Variability in Mirounga augustirostris (Pinnipedia, Phocidae)
Jones, Meredith Howe
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A study was done to compare the variability of skull dimensions of Mirounge angustirostris at the time of its near extinction with that of the present rapidly increasing population. Twenty measurements were made upon each of twenty-one skulls, and sixteen ratios developed from these measurements. The age, sex and year of collection of each specimen was recorded. The specimens were divided into an 1800 (near extinction) and 1900 (present) group on the basis of collection date. The ratio vs. age was plotted for the males and females of each year group. The regression line for each year group was calculated. The two populations were then compared as to variability by determining the variation around this regression line. No significant difference in variability was found.
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