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Fig. 6 | BMC Biology

Fig. 6

From: Caring for parents: an evolutionary rationale

Fig. 6

Numerical example for a 2 × 2 Leslie matrix (see Additional file 1 for details). a Maximum family long-term growth rate (fitness), b optimal level of backward help (y*), c average number of offspring at y*, and d offspring survival at y* all as a function of b (effectiveness of backward help) and a21 (effectiveness of forward help on offspring survival). Parameters: α2 = 6, ω1 = 0.45, ω2 = 0.62, ω3 = 0.25, d = 0.3, h = 1, c = 0.2, 0.6, 1, and a12 = 10

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