Probability of persistence (<i>ϕ</i>) of wood frog metapopulations at (a) Patuxent National Research Refuge, Maryland, USA and (b) Rock Creek Park, Washington, DC, USA, given the number of pools in the metapopulation (n), and marginal gains (<i>G</i>_<i>x</i>) associated with the number of pools managed (<i>x</i>).

<p>Simulation results are represented by closed circles (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0144786#pone.0144786.g001" target="_blank">Fig 1</a>). Management actions consisted of doing nothing or creating <i>x</i> pools.