Discuss Findings

mid_turnover_coop_gain -0.00058 +/- 0.00083 (d=-0.69598, sign-consistent=20.9%); mid_turnover_mixed_gain 0.00047 +/- 0.00077 (d=0.61143, sign-consistent=75.6%); mid_turnover_switch_penalty -0.00050 +/- 9.98277e-05 (d=-4.99386, sign-consistent=99.9%); support_fraction 0.26656 +/- 0.06284 (d=4.24176, sign-consistent=99.8%)

NO EFFECT (with mechanistic insight). Mid-rate refuge turnover imposes a reliable switching penalty (d=-4.99, 99.9% sign consistent) without producing the hypothesized cooperation gain (coop gain is weakly negative, d=-0.70, only 20.9% positive). The mixed-strategy gain is modestly positive (d=0.61, 75.6% consistent) but too small to offset the switching cost. The 26.7% support fraction across 1600 seeds shows the geometry exists in a minority of configurations but lacks functional benefit. Turnover disrupts strategy persistence more than it promotes cooperative refugia.