Data from: The contribution of a pollinating seed predator to selection on Silene latifolia females

Interactions, antagonistic or mutualistic, can exert selection on plant traits. We explored the role of Hadena bicruris, a pollinating seed predator, as a selective agent on its host, the dioecious plant Silene latifolia. We exposed females from artificial-selection lines (many, small flowers (SF) vs. few, large flowers (LF)) to this moth. Infestation did not differ significantly between lines, but the odds of attacked fruits aborting were higher in SF females. We partitioned selection between that caused by moth attack and that resulting from all other factors. In both lines, selection via moth attack for fewer, smaller flowers contrasted with selection via other factors for more flowers. In LF females, selection via the two components was strongest and selection via moth attack also favoured increased fruit abortion. This suggests that the moths act as more of a selective force on flower size and number via their predating than their pollinating role.生物交互作用（包括拮抗作用与互利作用）均可对植物性状施加选择压力。本研究探讨了Hadena bicruris（一种传粉型种子捕食者（pollinating seed predator））作为选择因子，对其宿主——雌雄异株植物Silene latifolia——所产生的选择作用。我们将来自两个人工选择品系——多花小型花（SF）品系与少花大型花（LF）品系——的雌株暴露于该蛾类环境中。不同品系间的侵染率并无显著差异，但受侵染果实的败育概率在SF品系雌株中更高。我们将选择压力划分为蛾类侵染引发的选择，以及其余所有因素引发的选择两类。在两个品系中，蛾类侵染介导的选择倾向于选择更少、更小的花，而其余因素介导的选择则倾向于选择更多的花，二者形成鲜明对比。在LF品系雌株中，两类因素介导的选择压力均为最强，且蛾类侵染介导的选择还会促进果实败育率提升。这表明，相较于传粉功能，该蛾类通过捕食行为对植物的花大小与花数量施加的选择压力更为显著。