Pacific walrus (Odobenus rosmarus divergens): Differential prey digestion and diet

By J. Grebmeier. 2009

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Impacts of changing sea-ice conditions on Arctic marine mammals (2011, background): “However, the magnitude of this dietary shift by walruses in the Pacific is difficult to assess (see Sheffield and Grebmeier 2009).”
Projected status of the Pacific walrus (Odobenus rosmarus divergens) in the twenty-first century (2011, background): “variety of organisms including small crustaceans, worms, snails, clams, marine birds, and seals (Fay 1982; SheYeld and Grebmeier 2009), but their diet most frequently consists of clams, snails, and polychaete worms (SheYeld and”
Methods of estimating marine mammal diets: A review of validation experiments and sources of bias and uncertainty (2012, background): “…fresh remains to those with digested remains, the effects of differential digestion of prey species on estimates of walrus diets were clearly evident, with fresh stomachs containing twice as many taxa and different proportions as those with digested contents (Sheffield and Grebmeier 2009).”