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Effects of variation in feeding level in the non‐breeding habitat (top row), annual survival of postsmolts (middle row) and cost of the breeding travel (bottom row) on sea age at first spawning. Same parameters as in Figure 2. The values correspond to the average population statistics after the transient dynamics have disappeared. The lower age at first spawning (in top and middle plot) is a direct consequence of a high growth rate in the breeding habitat
