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. 2013 Nov 5;11(11):e1001705. doi: 10.1371/journal.pbio.1001705

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© 2013 Pringle et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Equilibrium (A) tree carbon pools, C^*, and (B) ant colony size, W^*, as allocated in each mutualist's evolutionary stable strategy as a function of growing-season (rainy-season) duration. (C) Tree carbohydrate investment in ants, a, and (D) ant investment in colony growth, u, as a function of the season length T_s in the evolutionary stable strategy, while keeping the time a tree needs to replace its leaf area, τ, constant. Parameter values are: h = 0.1, L_max = 10, τ = 5, μ = 0.01, k = 10, and q₀ = 1.