Data from: There is more to pollinator-mediated selection than pollen limitation

Spatial variation in pollinator-mediated selection (Δβpoll) is a major driver of floral diversification, but we lack a quantitative understanding of its link to pollen limitation and net selection on floral traits. For 2-5 years, we quantified Δβpoll on floral traits in two populations each of two orchid species differing in pollen limitation. In both species, spatio-temporal variation in Δβpoll explained much of the variation in net selection. Selection was consistently stronger and the proportion that was pollinator-mediated was higher in the severely pollen-limited deceptive species than in the rewarding species. Within species, variation in pollen limitation could not explain variation in Δβpoll for any trait, indicating that factors influencing the functional relationship between trait variation and pollination success govern a major part of the observed variation in Δβpoll. Separating the effects of variation in mean interaction intensity and in the functional significance of traits will be necessary to understand spatio-temporal variation in selection exerted by the biotic environment.

传粉者介导的选择（pollinator-mediated selection，Δβpoll）的空间变异是花部性状多样化的主要驱动因素，但目前学界对其与花粉限制（pollen limitation）以及花部性状净选择之间的定量关联仍缺乏清晰认知。我们针对两个兰科物种开展了为期2至5年的野外观测，每个物种各设置两个种群，且各物种的种群间花粉限制程度存在差异，研究中量化了各物种花部性状的Δβpoll值。在两个物种中，Δβpoll的时空变异均可解释大部分净选择的变异量。相较于报酬性物种，受严重花粉限制的欺骗性兰科物种的选择强度始终更高，且传粉者介导的选择占总选择的比例也显著更高。在同一物种内部，花粉限制的变异无法解释任意花部性状的Δβpoll变异，这表明调控性状变异与传粉成功（pollination success）间功能关系的因素，主导了Δβpoll观测到的大部分变异。若要解析生物环境（biotic environment）所施加选择的时空变异，需分离平均互作强度变异与性状功能重要性变异的效应。