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Article appears in Marine Ecology Progress Series and is copyrighted by Inter Research.Abundances of larval walleye pollock in Shelikof Strait, Gulf of Alaska, in 1981 were far\udgreater than any recorded estimates before that time or since (some patch estimates exceeded 1\udlarvae per 10 m²). In spite of this extraordinary input, the ensuing 1981 year class was relatively poor.\udAn examination of the feeding habits of larvae collected from inside and outside dense larval patches\udrevealed that in 1981, larval walleye pollock consumed significantly more invertebrate eggs\ud(x = 66.7% of the total diet) and fewer copepod nauplii (x = 13.6%) inside of larval patches relative to\udoutside (x = 11.4 and 63.2%, respectively). These observations suggest that density dependent competition\udinside patches may have locally depleted the primary food source, copepod nauplii, prompting\uda diet switch to a lower quality but more abundant prey resource, invertebrate eggs. Results from a\udbioenergetics simulation support this theory, indicating that dense patches of walleye pollock larvae in\ud1981 were capable of exhausting naupliiar prey resources in Shelikof Strait in a relatively short period\udof time (14 to 40 d). Our observations contrast with other studies that suggest that ichthyoplankton\udexert little or no influence on microzooplankton standing stocks. Rather, we present evidence that, in\udcertain unusual circumstances, particularly dense aggregations of larvae are capable of locally depleting\udthe prey community. Such events may weaken larval condition and exacerbate natural death\udrates, which may have contributed to the poor recruitment success of the 1981 year class

Consequences of a superabundance of larval walleye pollock Theragra chalcogramma in the Gulf of Alaska in 1981