. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . Figure 37-14. Distribution of yellowfin sole in August in the eastern Bering Sea (tons/km^). EFFECTS OF SPACE AND TIME VARIATIONS IN THE DISTRIBUTION OF PREDATOR AND PREY Predation in any marine ecosystem is largely controlled by predator-prey size relations and the availability and suitability of prey. Thus if some "normal" or preferred prey items are not available, other food items of comparable size are substituted. This process is included in the DYNUMES model. In areas and
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . Figure 37-14. Distribution of yellowfin sole in August in the eastern Bering Sea (tons/km^). EFFECTS OF SPACE AND TIME VARIATIONS IN THE DISTRIBUTION OF PREDATOR AND PREY Predation in any marine ecosystem is largely controlled by predator-prey size relations and the availability and suitability of prey. Thus if some "normal" or preferred prey items are not available, other food items of comparable size are substituted. This process is included in the DYNUMES model. In areas and times when not enough food is available, starvation will occur with several of its consequences, the first of which is usually a delay of sex products development. Some of the dynamic aspects of predator-prey "overlap," pertaining especially to benthos and to seasonal migrations of flatfish, have already been presented (see Fig. 37-2). The effects of spatial distribution of different prey items on the composi- tion of food of a predator are schematically shown in Fig. 37-16, which depicts a vertical section with predator-prey distribution. Not only does the food composition of the predator vary in space, but the predation pressure on the prey varies as well. The various possible types of responses of predator and prey bio masses are shown in Fig. 37-17; although these responses can be classified into some defined types, there is considerable overlap of these responses in nature due to various predator-prey dynamic
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