Fecal samples collected seasonally at Sable Island were used to estimate the species composition of the diet of grey seals during the period 1991-1998 and in winter, 2010. Sand lance dominated the diet in all seasons and years. Sand lance was recovered in an average of 77.6 % (CV 20.7%) of scats indicating that most individuals in the population consumed this species. Both the occurrence (30.9%) and percentage of the diet (wet weight) comprising Atlantic cod were highly variable, with CVs of 53% and 104%, respectively, among seasons and years. Number correction factors were applied to attempt to reduce the bias associated with complete digestion of otoliths. Percentage of cod in the diet varied from 0 to 21.7 %, but showed no trend over time or significant differences among seasons. Cod averaged 7.1 % (7.4 SD) of the diet.
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