Nectar production dynamics can show inter- and intraspecific variation, which can be associated with environmental and ecological factors and with the ultrastructural diversity of the floral nectary. In this context, we recorded nectar production dynamics from a morphofunctional perspective using the hummingbird-pollinated Billbergia distachia (Bromeliaceae). The scale-throated hermit Phaethornis eurynome was the only floral visitor observed, indicating a specialized pollination system. Nectar production showed significant differences between day and night, and the periods of major pollinator activity and nectar secretion were synchronous. The ultrastructural features of the nectary showed some evidence of nectar reabsorption in flowers at night, and it can be inferred that this process may be a key factor in the nocturnal pause in nectar production. In this way, nectary morphoanatomy, nectar traits and an energy-saving mechanism through nectar reabsorption contribute to the well-established relationship between B. distachia and P. eurynome.

中文翻译：

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花蜜性状和蜜腺形态解剖在Billbergia distachia（Bromeliaceae）和隐士Phaethornis eurynome（Trochilidae）之间的植物-授粉媒介相互作用中的作用

花蜜的生产动态可以显示种内和种内变化，这可能与环境和生态因素以及花蜜的超微结构有关。在这种情况下，我们使用蜂鸟授粉的Billbergia distachia（Bromeliaceae）从形态功能的角度记录了花蜜的生产动态。鳞喉隐士Phaethornis eurynome是唯一观察到的花卉访客，表明有专门的授粉系统。花蜜生产在白天和晚上之间显示出显着差异，并且主要传粉媒介活动和花蜜分泌的时期是同步的。蜜腺的超微结构特征显示了夜间花朵中花蜜重吸收的一些证据，并且可以推断出该过程可能是花蜜生产中夜间停顿的关键因素。这样，蜜腺的形态解剖学，蜜腺性状和通过蜜蜜重吸收的节能机制有助于B. distachia和P. eurynome之间建立良好的关系。