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.

传粉者介导选择（pollinator-mediated selection）的空间变异Δβpoll是驱动花部分化的核心因子，但目前学界尚未对其与花粉限制、花部性状净选择之间的关联形成定量认知。本研究针对花粉限制程度存在差异的两个兰科物种，各选取两个种群，开展了2至5年的野外观测，量化了各物种花部性状的Δβpoll值。结果显示，两个物种的Δβpoll时空变异均解释了净选择变异的绝大部分。相较于奖励性传粉物种，严重花粉限制的欺骗性传粉物种所经受的选择强度始终更高，且传粉者介导的选择占比也更高。在物种内部，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间功能关系的因子，主导了Δβpoll观测变异的主要部分。未来需分别解析平均互作强度变异与性状功能意义变异的效应，方能理解生物环境施加选择的时空变异规律。