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The distinction between the nutritional quality and quantity of prey is one component of the hypotheses that attempt to explain the declining populations of Steller sea lions in the Gulf of Alaska beginning in the 1970s. One view holds that the quantity of prey available was high overall, but because of the species composition of available prey (primarily non-fatty fish of the gadid family), the diet was nutritionally inferior—the junk food hypothesis. An alternative view is that gadids are nutritionally adequate but were not available in sufficient numbers because of fishing or some other factor. In either case, juvenile sea lions would be affected more than mature individuals because of the younger animals' higher energy requirements and relative inexperience at foraging.

The passage indicates that proponents of the junk food hypothesis assert which of the following about non- fatty fish of the gadid family?

A.They provide adequate nourishment for sea lions when supplemented with a small number of other species.
B.They provide adequate nutrition for adult sea lions but not for juveniles.
C.They have been steadily declining in quantity in the Gulf of Alaska since the 1970s.
D.They are inadequate to satisfy sea lions' nutritional requirements even when available in abundance.
E.They are too challenging for juvenile sea lions to catch in significant numbers.

D显示答案

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