Fig. 6

If the gametic production resources R decline to the proportion \(q{\cdot }R\), the corresponding reduction of fertilized ovules \(E(F^*)\) may be compensable in two ways: By adjusting the proportion w of retained pollen to \(w^\prime\), or by adjusting the size h of the pollen dispersal range to \(h^\prime\). Left panel: For \(q = 0.4\), compensation is possible by adjustment of w only for very small w (green) and by adjustment of h for small w and large h (blue). Right panel: For \(q = 0.9\), compensation is possible by adjustment of w for more than half of the (w, h)-combinations (green) and by adjustment of h for most of the (w, h)-combinations (blue)