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The cntical stage in the iife history of waiieye poiiock Theragra chalcogramma at which recruitment is largely deterrnined has shifted in the Guif of Alaska population. This change foilows a major environmental regime-shift in the late 1970s and subsequent dorninance of the ecosystem by long-lived predatory flatfishes and cod. An exploratory iife table of data on stage-specific abundances was constructed to analyze decadal-scale changes in population demographics. Prior to the mid-1980s, recruitment was correlated with larval mortality, which was largely infiuenced by environmental con- ditions. After the mid-1980s, the larval mortalitylrecruitment relationship eroded, and there was a trend for greater,juvenile mortality coincidmg with an increase in the abundance of predatory flatfishes and cod. Control of recruitment appears to have shifted in recent years from environmental effects on larvae to biological control of juveniles. Ecosystem change and regirne status need to be considered when evaluating mechanisms underlying fish-population dynamics.

Shifting control of recruitment of walleye pollock Theragra chalcogramma after a major climatic and ecosystem change