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The food distribution before (solid line) and after (dashed line) an advanced peak date. The vertical lines mark the optimal arrival date (t*), the start of breeding (t1) and the end of breeding (t2) before the shift. The mortality risk is (a) high (b=0.05), (b) medium (b=0.07) or (c) low (b=0.1). Other parameter values are μ=150, σ=5, x1=10, x2=50, λmax=170 and z=0.1.
