The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberingsea00hood Year: 1981 PHYTOPLANKTON i HARBOR, SPOTTED RIBBON, RINGED SEALS MACRO IN- AND EPIFAUNAL -^ JNVERTEBRATES •NEKTOBENTHONIC INVERTEBRATES n MICRO IN- AND EPIFAUNAL INVERTEBRATES DETRITUS BACTERIA Figure 49-2. Generalized food web for harbor, spotted, ribbon, and ringed seals in the Bering Sea. BEARDED SEALS NEKTOBENTHONIC INVERTEBRATES INFAUNAL NVERTEBRATES PHYTOPLANKTON BENTHIC ALGAE DETRITUS BACTERIA Figure 49-3. Generalized food web for bearded seals and walruses
The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberingsea00hood Year: 1981 PHYTOPLANKTON i HARBOR, SPOTTED RIBBON, RINGED SEALS MACRO IN- AND EPIFAUNAL -^ JNVERTEBRATES •NEKTOBENTHONIC INVERTEBRATES n MICRO IN- AND EPIFAUNAL INVERTEBRATES DETRITUS BACTERIA Figure 49-2. Generalized food web for harbor, spotted, ribbon, and ringed seals in the Bering Sea. BEARDED SEALS NEKTOBENTHONIC INVERTEBRATES INFAUNAL NVERTEBRATES PHYTOPLANKTON BENTHIC ALGAE DETRITUS BACTERIA Figure 49-3. Generalized food web for bearded seals and walruses in the Bering Sea. is in equilibrium, changes in population size of one consumer species will affect other consumer populations. People also compete directly w^ith pinnipeds for food. Commercial fisheries can alter not only the total standing stock of fishes (or shellfishes) in a given area but also the proportion of individual fish species in the biomass. Changes in composition of the fish fauna apparently induced by fishing have been documented for the North Sea (May et al. 1979) and have probably also occurred in the Bering Sea (Pruter TABLE 49-3 Relative importance of major prey types in the diet of pinnipeds in the eastern Bering Sea. Pelagic and Pelagic Epifaunal Infaunal Predator semidemersal Demersal nektonic Nektobenthonic benthic benthic species fishes fishes invertebrates invertebrates invertebrates invertebrates Harbor seal Major Minor Minor Spotted seal Major Minor Major for juveniles Minor for adults Major for juveniles Ribbon seal Major Major Minor Ringed seal Major Minor Major Major Bearded seal Minor Major Major Major in some areas Walrus Minor Minor Major Fur seal Major Major (Squids) Sea lion Major Minor Minor
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