Long-term variability in spawning stock age structure influences climate-recruitment link for Barents Sea cod.

Subsequently, an increasing trend is found to around 1980 with a maximum correlation of .59, followed by a decrease until the most recent years with correlations close to 0 (Figure 4 ).

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There is far less of an obvious trend in age diversity of the spawning stock, as represented by Shannon's H, although there is a decline from around 1950 to the late 1990s (Figure 5b ).

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